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       # ELSA, INC.
       
          MICROLINK ISDN/TL PRO
       
          Card Type              ISDN TA                                 
          Chip Set               Unidentified                            
          I/O Options            Power connector power switch, DTE port, 
                                 ISDN interface (RJ-11)                  
          ISDN Data Rate         230.4Kbps                               
          ISDN Modulation        V.110, V.120, X.75, PPP, T - online     
          Protocol               
          Error                  MNP5, V.42bis                           
          Correction/Compression 
          Data Bus               External                                
       
   IMG IMG 1
          
       
          +------------------------------------------------------------+
          |                        CONNECTIONS                         |
          |------------------------------------------------------------|
          |      Function       | Label |       Function       | Label |
          |---------------------+-------+----------------------+-------|
          | AC power connector  |  CN1  | ISDN interface       |  CN3  |
          |                     |       | (RJ-11 connector)    |       |
          |---------------------+-------+----------------------+-------|
          | 25-pin DTE serial   |  CN2  | Power switch         |  SW1  |
          | port                |       |                      |       |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                     DIAGNOSTIC LED(S)                      |
          |------------------------------------------------------------|
          |  LED  |    Color     |  Status  |        Condition         |
          |-------+--------------+----------+--------------------------|
          |  PWR  | Unidentified |    On    |       Power is on        |
          |-------+--------------+----------+--------------------------|
          |  PWR  | Unidentified |   Off    |       Power is off       |
          |-------+--------------+----------+--------------------------|
          |  STS  | Unidentified |    On    |    ISDN link is good     |
          |-------+--------------+----------+--------------------------|
          |  STS  | Unidentified | Blinking | ISDN link negotiation in |
          |       |              |          |         progress         |
          |-------+--------------+----------+--------------------------|
          |  STS  | Unidentified |   Off    |   ISDN link is broken    |
          |-------+--------------+----------+--------------------------|
          |  LNE  | Unidentified |    On    |   Connection is being    |
          |       |              |          |       established        |
          |-------+--------------+----------+--------------------------|
          |  LNE  | Unidentified | Blinking |     Incoming call is     |
          |       |              |  (slow)  |      received, but       |
          |       |              |          |  incompatible with unit  |
          |-------+--------------+----------+--------------------------|
          |  LNE  | Unidentified | Blinking |  Incoming call not yet   |
          |       |              |  (fast)  |         accepted         |
          |-------+--------------+----------+--------------------------|
          |  LNE  | Unidentified |   Off    |   Connection is broken   |
          |-------+--------------+----------+--------------------------|
          |  TX   | Unidentified |    On    | MICROLINK ISDN/TL PRO is |
          |       |              |          |   receiving data from    |
          |       |              |          |      remote or DTE       |
          |-------+--------------+----------+--------------------------|
          |  TX   | Unidentified |   Off    | MICROLINK ISDN/TL PRO is |
          |       |              |          | not receiving data from  |
          |       |              |          |      remote or DTE       |
          |-------+--------------+----------+--------------------------|
          |  RX   | Unidentified |    On    | MICROLINK ISDN/TL PRO is |
          |       |              |          |  transmitting data from  |
          |       |              |          |      remote or DTE       |
          |-------+--------------+----------+--------------------------|
          |  RX   | Unidentified |   Off    |  MICROLINK ISDN/TL PRO   |
          |       |              |          |  not transmitting data   |
          |       |              |          |    from remote or DTE    |
          |-------+--------------+----------+--------------------------|
          |  DTR  | Unidentified |    On    | Terminal/computer ready  |
          |       |              |          |      for operation       |
          |-------+--------------+----------+--------------------------|
          |   DTR | Unidentified |   Off    |  Terminal/computer not   |
          |       |              |          |   ready for operation    |
          |-------+--------------+----------+--------------------------|
          |  DSR  | Unidentified |    On    |  MICROLINK ISDN/TL PRO   |
          |       |              |          |   ready for operation    |
          |-------+--------------+----------+--------------------------|
          |  DSR  | Unidentified |   Off    |  MICROLINK ISDN/TL PRO   |
          |       |              |          |   ready for operation    |
          |-------+--------------+----------+--------------------------|
          |  RTS  | Unidentified |    On    |    Sending device is     |
          |       |              |          |         enabled          |
          |-------+--------------+----------+--------------------------|
          |  RTS  | Unidentified |   Off    |    Sending device is     |
          |       |              |          |         disabled         |
          |-------+--------------+----------+--------------------------|
          |  CTS  | Unidentified |    On    |  MICROLINK ISDN/TL PRO   |
          |       |              |          |    ready to send data    |
          |-------+--------------+----------+--------------------------|
          |  CTS  | Unidentified |   Off    |  MICROLINK ISDN/TL PRO   |
          |       |              |          |  not ready to send data  |
          |-------+--------------+----------+--------------------------|
          |  DCD  |     Red      |    On    |   V.110, V.100 or PPP    |
          |       |              |          |  connection established  |
          |-------+--------------+----------+--------------------------|
          |  DCD  |    Green     |    On    |    V.120, X.75, MNP5,    |
          |       |              |          | V.42bis error correction |
          |       |              |          |  connection established  |
          |-------+--------------+----------+--------------------------|
          |  DCD  |    Orange    |    On    | Channel building enabled |
          |-------+--------------+----------+--------------------------|
          |  DCD  |     N/A      |   Off    | ISDN modulation protocol |
          |       |              |          |     not established      |
          |-------+--------------+----------+--------------------------|
          |  TST  | Unidentified |    On    | MICROLINK ISDN/TL PRO is |
          |       |              |          |    performing a self     |
          |       |              |          |     diagnostic test      |
          |-------+--------------+----------+--------------------------|
          |  TST  | Unidentified |   Off    | MICROLINK ISDN/TL PRO is |
          |       |              |          |  not performing a self   |
          |       |              |          |     diagnostic test      |
          +------------------------------------------------------------+
       
          +---------------------------------------------------------+
          |                  SUPPORTED COMMAND SET                  |
          |---------------------------------------------------------|
          |                    Basic AT Commands                    |
          |---------------------------------------------------------|
          | AT, A/                                                  |
          |---------------------------------------------------------|
          | A, E, V, Z                                              |
          |---------------------------------------------------------|
          | &F, &V, &W                                              |
          |---------------------------------------------------------|
          |                  Extended AT Commands                   |
          |---------------------------------------------------------|
          | \T, \X                                                  |
          |---------------------------------------------------------|
          |                       S Registers                       |
          |---------------------------------------------------------|
          | S0, S1, S2, S3, S4, S5, S12, S30                        |
          |---------------------------------------------------------|
          |                                                         |
          |---------------------------------------------------------|
          | Note: See MHI Help File for full command documentation. |
          +---------------------------------------------------------+
       
                            Proprietary AT Command Set
       
          +------------------------------------------------------------+
          |                      CHANNEL BUNDLING                      |
          |------------------------------------------------------------|
          | Type:        | Configuration                               |
          |--------------+---------------------------------------------|
          | Format:      | AT [cmds] &Mn [cmds]                        |
          |--------------+---------------------------------------------|
          | Description: | Selects channel bundling mode               |
          |--------------+---------------------------------------------|
          |   Command    |                    Mode                     |
          |--------------+---------------------------------------------|
          |     í&N0     | Channel bundling disabled                   |
          |--------------+---------------------------------------------|
          |     &N1      | Channel bundling enabled                    |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                    COMMUNICATIONS MODE                     |
          |------------------------------------------------------------|
          | Type:        | Configuration                               |
          |--------------+---------------------------------------------|
          | Format:      | AT [cmds] &Mn [cmds]                        |
          |--------------+---------------------------------------------|
          | Description: | Selects communications mode                 |
          |--------------+---------------------------------------------|
          |   Command    |                    Mode                     |
          |--------------+---------------------------------------------|
          |     &M0      | Asynchronous mode                           |
          |--------------+---------------------------------------------|
          |     &M1      | Synchronous connect mode                    |
          |--------------+---------------------------------------------|
          |     &M2      | Synchronous connect mode and set DTR high.  |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                 DATA CARRIER DETECT (DCD)                  |
          |------------------------------------------------------------|
          | Type:        | Configuration                               |
          |--------------+---------------------------------------------|
          | Format:      | AT [cmds] &Cn [cmds]                        |
          |--------------+---------------------------------------------|
          | Description: | Selects whether the DCD option is enabled   |
          |              | or disabled                                 |
          |--------------+---------------------------------------------|
          |   Command    |                  Function                   |
          |--------------+---------------------------------------------|
          |     &C0      | DCD enabled                                 |
          |--------------+---------------------------------------------|
          |     í&C1     | DCD enabled after carrier signal detected   |
          |--------------+---------------------------------------------|
          |     &C2      | DCD dropped during disconnection            |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                    DATA SET READY (DSR)                    |
          |------------------------------------------------------------|
          | Type:        | Configuration                               |
          |--------------+---------------------------------------------|
          | Format:      | AT [cmds] &Sn [cmds]                        |
          |--------------+---------------------------------------------|
          | Description: | Selects DSR options                         |
          |--------------+---------------------------------------------|
          |   Command    |                  Function                   |
          |--------------+---------------------------------------------|
          |     &S0      | DSR forced high                             |
          |--------------+---------------------------------------------|
          |     &S1      | DSR indicates B-channel switched through    |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                 DATA TERMINAL READY (DTR)                  |
          |------------------------------------------------------------|
          | Type:              | Configuration                         |
          |--------------------+---------------------------------------|
          | Format:            | AT [cmds] &Dn [cmds]                  |
          |--------------------+---------------------------------------|
          | Description:       | Selects modem response to DTR         |
          |------------------------------------------------------------|
          |  Command  | Command State |   Connection   |   Existing    |
          |           |               | Establishment  |  Connection   |
          |-----------+---------------+----------------+---------------|
          |    &D1    | No effect     | Connection     | ISDN terminal |
          |           |               | establishment  | adapter       |
          |           |               | is aborted     | shifts to     |
          |           |               |                | command state |
          |-----------+---------------+----------------+---------------|
          |    &D2    | Existing      | Connection     | ISDN terminal |
          |           | condition     | establishment  | adapter       |
          |           | terminated;   | is aborted     | shifts to     |
          |           | stored digits |                | command       |
          |           | are cleared   |                | state;        |
          |           |               |                | connection    |
          |           |               |                | terminated    |
          |-----------+---------------+----------------+---------------|
          |    &D3    | Existing      | Connection     | and ISDN      |
          |           | condition     | establishment  | terminal      |
          |           | terminated;   | is aborted and | adapter       |
          |           | stored digits | ISDN terminal  | shifts to     |
          |           | are cleared   | adapter is     | command       |
          |           | and ISDN      | reinitialized  | state; ISDN   |
          |           | terminal      |                | terminal      |
          |           | adapter is    |                | adapter is    |
          |           | reinitialized |                | reinitialized |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                            DIAL                            |
          |------------------------------------------------------------|
          | Type:        | Immediate                                   |
          |--------------+---------------------------------------------|
          | Format:      | AT [cmds] D<#> [cmds]                       |
          |--------------+---------------------------------------------|
          | Description: | Dials telephone number according to any     |
          |              | modifiers included in the string            |
          |--------------+---------------------------------------------|
          | Note:        | Any combination of modifiers can be used to |
          |              | produce the desired dial functions in       |
          |              | sequence.                                   |
          |--------------+---------------------------------------------|
          |   Command    |                  Function                   |
          |--------------+---------------------------------------------|
          |      DL      | Re-dial last number                         |
          |--------------+---------------------------------------------|
          |  DS=n, D/n   | Dial stored telephone number n              |
          |--------------+---------------------------------------------|
          |    DS, D/    | Dial stored telephone number 0              |
          |--------------+---------------------------------------------|
          |      DN      | Establish a modem connection                |
          |--------------+---------------------------------------------|
          |      DI      | Establish a ISDN connection                 |
          |--------------+---------------------------------------------|
          |      D*      | Phone number component for controlling PBX  |
          |              | systems                                     |
          |--------------+---------------------------------------------|
          |      D#      | 1TR6 protocol: Dialing code for external    |
          |              | calls (valid for some ISDN branch           |
          |              | exchanges)                                  |
          |              |                                             |
          |              | DSS1 protocol: Sending complete (additional |
          |              | information required in some countries)     |
          |--------------+---------------------------------------------|
          |      D;      | Store digits preceding semicolon in NVRAM   |
          |              | and dial them when an ATO command is        |
          |              | executed without a data connection          |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                        HOOK CONTROL                        |
          |------------------------------------------------------------|
          | Type:        | Immediate                                   |
          |--------------+---------------------------------------------|
          | Format:      | AT [cmds] Hn [cmds]                         |
          |--------------+---------------------------------------------|
          | Description: | Selects whether the modem is on-hook or     |
          |              | off-hook                                    |
          |--------------+---------------------------------------------|
          |   Command    |                  Function                   |
          |--------------+---------------------------------------------|
          |      H0      | Modem commanded to go on-hook (hang-up)     |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                         LINE TYPE                          |
          |------------------------------------------------------------|
          | Type:        | Configuration                               |
          |--------------+---------------------------------------------|
          | Format:      | AT [cmds] &Ln [cmds]                        |
          |--------------+---------------------------------------------|
          | Description: | Selects line type                           |
          |--------------+---------------------------------------------|
          |   Command    |                  Line Type                  |
          |--------------+---------------------------------------------|
          |     &L0      | Switched line (PSTN/Dial-up)                |
          |--------------+---------------------------------------------|
          |     &L1      | Group 0 leased-line. Manual connection      |
          |--------------+---------------------------------------------|
          |     &L2      | Group 0 leased-line. Automatic connection   |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                          ON-LINE                           |
          |------------------------------------------------------------|
          | Type:            | Immediate                               |
          |------------------+-----------------------------------------|
          | Format:          | AT [cmds] On [cmds]                     |
          |------------------+-----------------------------------------|
          | Description:     | Controls on-line command (data          |
          |                  | transmission) state options.            |
          |------------------------------------------------------------|
          |      Note:  The O command must be placed at the end of the |
          |      command string.                                       |
          |------------------------------------------------------------|
          |     Command      |                Function                 |
          |------------------+-----------------------------------------|
          |        O0        | On-line command mode enabled            |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |           REACTION TO BUSY LINE/CONNECT MESSAGE            |
          |------------------------------------------------------------|
          | Type:        | Configuration                               |
          |--------------+---------------------------------------------|
          | Format:      | AT [cmds] Xn [cmds]                         |
          |--------------+---------------------------------------------|
          | Description: | Enables selection of tone detection and     |
          |              | associated result code format options       |
          |--------------+---------------------------------------------|
          |   Command    |                  Function                   |
          |--------------+---------------------------------------------|
          |      X0      | Busy line reported with NO CARRIER          |
          |--------------+---------------------------------------------|
          |      X1      | Busy line reported with NO CARRIER          |
          |--------------+---------------------------------------------|
          |      X2      | Busy line reported with NO CARRIER          |
          |--------------+---------------------------------------------|
          |      X3      | Busy line reported with BUSY                |
          |--------------+---------------------------------------------|
          |      X4      | Busy line reported with BUSY                |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                     REPORT INFORMATION                     |
          |------------------------------------------------------------|
          | Type:        | Immediate                                   |
          |--------------+---------------------------------------------|
          | Format:      | AT [cmds] In [cmds]                         |
          |--------------+---------------------------------------------|
          | Description: | Displays information requested              |
          |--------------+---------------------------------------------|
          |   Command    |                  Function                   |
          |--------------+---------------------------------------------|
          |      I0      | Reports model number in nnn format          |
          |--------------+---------------------------------------------|
          |      I1      | Reports ROM checksum                        |
          |--------------+---------------------------------------------|
          |      I2      | Tests and reports ROM checksum              |
          |--------------+---------------------------------------------|
          |      I3      | Reports firmware version number and release |
          |              | date                                        |
          |--------------+---------------------------------------------|
          |      I4      | Reports current parameter settings          |
          |--------------+---------------------------------------------|
          |      I5      | Reports serial number                       |
          |--------------+---------------------------------------------|
          |      I6      | Reports product name and hardware release   |
          |--------------+---------------------------------------------|
          |      I7      | Reports plug and play ID text               |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                        RESULT CODES                        |
          |------------------------------------------------------------|
          | Type:        | Configuration                               |
          |--------------+---------------------------------------------|
          | Format:      | AT [cmds] Qn [cmds]                         |
          |--------------+---------------------------------------------|
          | Description: | Enables modem to send result codes to the   |
          |              | DTE                                         |
          |--------------+---------------------------------------------|
          |   Command    |                  Function                   |
          |--------------+---------------------------------------------|
          |      Q0      | Result code sending from ISDN terminal      |
          |              | adapter enabled                             |
          |--------------+---------------------------------------------|
          |      Q1      | Result code sending from ISDN terminal      |
          |              | adapter disabled                            |
          |--------------+---------------------------------------------|
          |      Q2      | Result code sending in answer mode disabled |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                          RTS/CTS                           |
          |------------------------------------------------------------|
          | Type:        | Configuration                               |
          |--------------+---------------------------------------------|
          | Format:      | AT [cmds] &Rn [cmds]                        |
          |--------------+---------------------------------------------|
          | Description: | Selects RTS/CTS options                     |
          |--------------+---------------------------------------------|
          |   Command    |                  Function                   |
          |--------------+---------------------------------------------|
          |     í&R0     | CTS follows RTS                             |
          |--------------+---------------------------------------------|
          |     &R1      | CTS forced high, RTS is ignored.            |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                       STORE NUMBERS                        |
          |------------------------------------------------------------|
          | Type:        | Configuration                               |
          |--------------+---------------------------------------------|
          | Format:      | AT [cmds] &Zm=n                             |
          |--------------+---------------------------------------------|
          | Description: | Writes selected ISDN numbers n into the     |
          |              | non-volatile memory at location m (0-9)     |
          |------------------------------------------------------------|
          |      Note: Telephone numbers can include up to 36          |
          |      characters.                                           |
          +------------------------------------------------------------+
       
                             Extended AT Command Set
       
          +------------------------------------------------------------+
          |                 BIT RATE (POST CONNECTION)                 |
          |------------------------------------------------------------|
          | Type:        | Configuration                               |
          |--------------+---------------------------------------------|
          | Format:      | AT [cmds] \Jn [cmds]                        |
          |--------------+---------------------------------------------|
          | Description: | Determines fixed or variable bit rate       |
          |--------------+---------------------------------------------|
          |   Command    |                  Function                   |
          |--------------+---------------------------------------------|
          |     í\J0     | Computer line bit rate remains unchanged    |
          |--------------+---------------------------------------------|
          |     \J1      | DTE rate matches DCE rate                   |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |              BIT RATE ADAPTION IN ANSWER MODE              |
          |------------------------------------------------------------|
          | Type:        | Configuration                               |
          |--------------+---------------------------------------------|
          | Format:      | AT [cmds] %Ln [cmds]                        |
          |--------------+---------------------------------------------|
          | Description: | Determines whether V.110 mode line bit rate |
          |              | is adapted to the bit rate of the remote    |
          |              | system                                      |
          |--------------+---------------------------------------------|
          |   Command    |                  Function                   |
          |--------------+---------------------------------------------|
          |     %L0      | Bit rate is adapted to remote system        |
          |--------------+---------------------------------------------|
          |     í%L1     | Bit rate is adapted to remote system        |
          |--------------+---------------------------------------------|
          |     %L2      | Bit rate is not adapted; connection is      |
          |              | terminated                                  |
          |--------------+---------------------------------------------|
          |     %L3      | Bit rate is adapted to remote system        |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                        COMPRESSION                         |
          |------------------------------------------------------------|
          | Type:        | Configuration                               |
          |--------------+---------------------------------------------|
          | Format:      | AT [cmds] %Cn [cmds]                        |
          |--------------+---------------------------------------------|
          | Description: | Selects data compression                    |
          |--------------+---------------------------------------------|
          |   Command    |                  Function                   |
          |--------------+---------------------------------------------|
          |     %C0      | Data compression disabled                   |
          |--------------+---------------------------------------------|
          |     %C1      | V.42bis enabled                             |
          |--------------+---------------------------------------------|
          |     %C2      | V.42bis enabled                             |
          |--------------+---------------------------------------------|
          |     í%C3     | V.42bis enabled                             |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                        CONNECT MODE                        |
          |------------------------------------------------------------|
          | Type:        | Configuration                               |
          |--------------+---------------------------------------------|
          | Format:      | AT [cmds] \Nn [cmds]                        |
          |--------------+---------------------------------------------|
          | Description: | Controls the type of connection the modem   |
          |              | will operate in                             |
          |--------------+---------------------------------------------|
          |   Command    |                  Function                   |
          |--------------+---------------------------------------------|
          |     \N0      | V.110 normal mode enabled                   |
          |--------------+---------------------------------------------|
          |     \N1      | V.110 direct mode enabled                   |
          |--------------+---------------------------------------------|
          |     \N2      | X.75 error correction mode enabled.         |
          |              | Connection is aborted if modem does not     |
          |              | support X.75                                |
          |--------------+---------------------------------------------|
          |     \N3      | X.75 error correction mode enabled. Modem   |
          |              | fallback to V.110 if modem does not support |
          |              | X.75                                        |
          |--------------+---------------------------------------------|
          |     \N4      | V.120 error correction mode enabled.        |
          |              | Connection is aborted if modem does not     |
          |              | support V.120                               |
          |--------------+---------------------------------------------|
          |     \N5      | V.120 error correction mode enabled. Modem  |
          |              | fallback to V.110 if modem does not support |
          |              | V.120                                       |
          |--------------+---------------------------------------------|
          |     \N6      | V.120 or X.75 error correction mode enabled |
          |              | for incoming calls. Outgoing calls are      |
          |              | performed with X.75 (Europe) or V.120       |
          |              | (America)                                   |
          |--------------+---------------------------------------------|
          |     \N7      | V.120 or X.75 error correction mode enabled |
          |              | for incoming calls. Outgoing calls are      |
          |              | performed with X.75 (Europe) or V.120       |
          |              | (America). Modem fallback to V.110 if       |
          |              | connection cannot be established            |
          |--------------+---------------------------------------------|
          |     \N8      | German T-Online service error correction    |
          |              | mode enabled. VT-100 pages may be displayed |
          |              | with a VT-100 compatible terminal           |
          |--------------+---------------------------------------------|
          |     \N9      | German T-Online service error correction    |
          |              | mode enabled. Btx and KIT graphics pages    |
          |              | may be displayed with Btx or KIT decoder    |
          |--------------+---------------------------------------------|
          |     \N10     | HDLC transparent mode enabled (PPP          |
          |              | conversion required)                        |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                      DSR/CTS CONTROL                       |
          |------------------------------------------------------------|
          | Type:        | Configuration                               |
          |--------------+---------------------------------------------|
          | Format:      | AT [cmds] \Dn [cmds]                        |
          |--------------+---------------------------------------------|
          | Description: | Controls DSR and CTS lines                  |
          |--------------+---------------------------------------------|
          |   Command    |                  Function                   |
          |--------------+---------------------------------------------|
          |     \D0      | DSR and CTS forced high                     |
          |--------------+---------------------------------------------|
          |     \D1      | DSR indicates B-channel switched through,   |
          |              | CTS forced high                             |
          |--------------+---------------------------------------------|
          |     \D2      | DSR forced high, CTS follows DCD            |
          |--------------+---------------------------------------------|
          |     \D3      | DSR indicates B-channel switched through,   |
          |              | CTS follows DCD                             |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |             ERROR CORRECTION CONNECT MESSAGES              |
          |------------------------------------------------------------|
          | Type:        | Configuration                               |
          |--------------+---------------------------------------------|
          | Format:      | AT [cmds] \Vn [cmds]                        |
          |--------------+---------------------------------------------|
          | Description: | Determines the comprehensiveness of error   |
          |              | correction CONNECT messages                 |
          |--------------+---------------------------------------------|
          |   Command    |                  Function                   |
          |--------------+---------------------------------------------|
          |     \V0      | Extended result codes disabled              |
          |--------------+---------------------------------------------|
          |     \V1      | Identifies error corrected connections      |
          |--------------+---------------------------------------------|
          |     \V2      | Identifies error corrected connections and  |
          |              | types                                       |
          |--------------+---------------------------------------------|
          |     í\V8     | Comprehensive CONNECT messages              |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                      FIRMWARE UPLOAD                       |
          |------------------------------------------------------------|
          | Type:        | Immediate                                   |
          |--------------+---------------------------------------------|
          | Format:      | AT [cmds] UPX  [cmds]                       |
          |--------------+---------------------------------------------|
          | Description: | Readies device to receive firmware upload   |
          |              | in flash ROM at transfer rate last used, up |
          |              | to 57.6Kbps                                 |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                      FIRMWARE VERSION                      |
          |------------------------------------------------------------|
          | Type:        | Immediate                                   |
          |--------------+---------------------------------------------|
          | Format:      | AT [cmds] %V  [cmds]                        |
          |--------------+---------------------------------------------|
          | Description: | Displays firmware version of the ISDN TA on |
          |              | the monitor                                 |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                     FLOW CONTROL TYPE                      |
          |------------------------------------------------------------|
          | Type:        | Configuration                               |
          |--------------+---------------------------------------------|
          | Format:      | AT [cmds] \Qn [cmds]                        |
          |--------------+---------------------------------------------|
          | Description: | Sets type of flow control used by TA        |
          |--------------+---------------------------------------------|
          |   Command    |                  Function                   |
          |--------------+---------------------------------------------|
          |     \Q0      | Flow control disabled                       |
          |--------------+---------------------------------------------|
          |     \Q1      | Bi-directional XON/XOFF flow control        |
          |              | enabled                                     |
          |--------------+---------------------------------------------|
          |     \Q2      | CTS flow control by DCE enabled             |
          |--------------+---------------------------------------------|
          |     í\Q3     | Bi-directional RTS/CTS flow control enabled |
          |--------------+---------------------------------------------|
          |     \Q4      | Unidirectional XON/XOFF flow control by DCE |
          |              | enabled                                     |
          |--------------+---------------------------------------------|
          |     \Q5      | CTS flow control by DCE enabled. CTS low    |
          |              | until connection established                |
          |--------------+---------------------------------------------|
          |     \Q6      | Bi-directional RTS/CTS flow control         |
          |              | enabled. CTS low until connection           |
          |              | established                                 |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                   ISDN BIT RATE (V.110)                    |
          |------------------------------------------------------------|
          | Type:        | Configuration                               |
          |--------------+---------------------------------------------|
          | Format:      | AT [cmds] %Bn [cmds]                        |
          |--------------+---------------------------------------------|
          | Description: | Selects ISDN bit rate in V.110 mode         |
          |--------------+---------------------------------------------|
          |   Command    |                  Function                   |
          |--------------+---------------------------------------------|
          |    %B1200    | 1200bps                                     |
          |--------------+---------------------------------------------|
          |    %B2400    | 2400bps                                     |
          |--------------+---------------------------------------------|
          |    %B4800    | 4800bps                                     |
          |--------------+---------------------------------------------|
          |    %B9600    | 9600bps                                     |
          |--------------+---------------------------------------------|
          |   %B19200    | 19.2Kbps                                    |
          |--------------+---------------------------------------------|
          |   í%B38400   | 38.4Kbps                                    |
          |--------------+---------------------------------------------|
          |   %B48000    | 48.0Kbps                                    |
          |--------------+---------------------------------------------|
          |   %B56000    | 56.0Kbps                                    |
          |--------------+---------------------------------------------|
          |   %B64000    | 64.0Kbps                                    |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |             ISDN BIT RATE (V.120, X.75, HDLC)              |
          |------------------------------------------------------------|
          | Type:        | Configuration                               |
          |--------------+---------------------------------------------|
          | Format:      | AT [cmds] %Sn [cmds]                        |
          |--------------+---------------------------------------------|
          | Description: | Selects ISDN bit rate in V.110 mode         |
          |--------------+---------------------------------------------|
          |   Command    |                  Function                   |
          |--------------+---------------------------------------------|
          |     í%S0     | 64Kbps                                      |
          |--------------+---------------------------------------------|
          |     %S1      | 56Kbps                                      |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                       LINE BIT RATE                        |
          |------------------------------------------------------------|
          | Type:        | Configuration                               |
          |--------------+---------------------------------------------|
          | Format:      | AT [cmds] %Gn [cmds]                        |
          |--------------+---------------------------------------------|
          | Description: | Selects line bit rate control               |
          |--------------+---------------------------------------------|
          |   Command    |                  Function                   |
          |--------------+---------------------------------------------|
          |     í%G0     | Line bit rate determined by serial port     |
          |              | rate                                        |
          |--------------+---------------------------------------------|
          |     %G1      | Line bit rate set by %B                     |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                 PPP ASYNC/SYNC CONVERSION                  |
          |------------------------------------------------------------|
          | Type:        | Configuration                               |
          |--------------+---------------------------------------------|
          | Format:      | AT [cmds] %Pn [cmds]                        |
          |--------------+---------------------------------------------|
          | Description: | Enables/disables asynchronous/synchronous   |
          |              | conversion for point-to-point protocol      |
          |--------------+---------------------------------------------|
          |   Command    |                  Function                   |
          |--------------+---------------------------------------------|
          |     í%P0     | Asynchronous/synchronous conversion for     |
          |              | point-to-point protocol disabled            |
          |--------------+---------------------------------------------|
          |     %P1      | Asynchronous/synchronous conversion for     |
          |              | point-to-point protocol enabled             |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                  REGISTER CONTENT DISPLAY                  |
          |------------------------------------------------------------|
          | Type:        | Configuration                               |
          |--------------+---------------------------------------------|
          | Format:      | AT [cmds] %Sn [cmds]                        |
          |--------------+---------------------------------------------|
          | Description: | Selects number of registers displayed per   |
          |              | line                                        |
          |--------------+---------------------------------------------|
          |   Command    |                  Function                   |
          |--------------+---------------------------------------------|
          |     í%R0     | Display two registers per line              |
          |--------------+---------------------------------------------|
          |     %R1      | Display one register per line               |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                       STORE NUMBERS                        |
          |------------------------------------------------------------|
          | Type:        | Configuration                               |
          |--------------+---------------------------------------------|
          | Format:      | AT [cmds] \Pmn [cmds]                       |
          |--------------+---------------------------------------------|
          | Range:       | m = 0-9                                     |
          |--------------+---------------------------------------------|
          | Description: | Up to ten ISDN numbers can be stored in     |
          |              | NVRAM. Numbers n may have up to 36          |
          |              | characters                                  |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                       STORED NUMBERS                       |
          |------------------------------------------------------------|
          | Type:        | Immediate                                   |
          |--------------+---------------------------------------------|
          | Format:      | AT [cmds] \F [cmds]                         |
          |--------------+---------------------------------------------|
          | Description: | Displays ISDN numbers stored with the /P or |
          |              | &Z commands                                 |
          +------------------------------------------------------------+
       
                                 Special Commands
       
          +------------------------------------------------------------+
          |                   AUTOMATIC DTR DIALING                    |
          |------------------------------------------------------------|
          | Type:        | Configuration                               |
          |--------------+---------------------------------------------|
          | Format:      | AT [cmds] $Dn [cmds]                        |
          |--------------+---------------------------------------------|
          | Description: | Enables/disables automatic DTR dialing      |
          |--------------+---------------------------------------------|
          |   Command    |                  Function                   |
          |--------------+---------------------------------------------|
          |     $D0      | DTR dialing disabled                        |
          |--------------+---------------------------------------------|
          |     $D1      | DTR dialing enabled                         |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                         DUMB MODE                          |
          |------------------------------------------------------------|
          | Type:        | Configuration                               |
          |--------------+---------------------------------------------|
          | Format:      | AT [cmds] -Hn [cmds]                        |
          |--------------+---------------------------------------------|
          | Description: | Suppresses message echoing                  |
          |--------------+---------------------------------------------|
          |   Command    |                  Function                   |
          |--------------+---------------------------------------------|
          |     í-H0     | Normal operation                            |
          |--------------+---------------------------------------------|
          |     -H1      | Dumb mode                                   |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |               EXTENDED CONFIGURATION PROFILE               |
          |------------------------------------------------------------|
          | Type:        | Configuration                               |
          |--------------+---------------------------------------------|
          | Format:      | AT [cmds] *Wn [cmds]                        |
          |--------------+---------------------------------------------|
          | Description: | Saves extended configuration profile        |
          |--------------+---------------------------------------------|
          |   Command    |                  Function                   |
          |--------------+---------------------------------------------|
          |     *W0      | Saves extended configuration profile 0 to   |
          |              | NVRAM and values in registers, S2, S3, S4,  |
          |              | S5 & S12                                    |
          |--------------+---------------------------------------------|
          |     *W1      | Saves extended configuration profile 1 to   |
          |              | NVRAM and values in registers, S2, S3, S4,  |
          |              | S5 & S12                                    |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                  INVALID ESCAPE MESSAGES                   |
          |------------------------------------------------------------|
          | Type:        | Configuration                               |
          |--------------+---------------------------------------------|
          | Format:      | AT [cmds] *Qn [cmds]                        |
          |--------------+---------------------------------------------|
          | Description: | Enables/disables CONNECT message after      |
          |              | invalid escape                              |
          |--------------+---------------------------------------------|
          |   Command    |                  Function                   |
          |--------------+---------------------------------------------|
          |     í*Q0     | CONNECT message after invalid escape        |
          |              | enabled                                     |
          |--------------+---------------------------------------------|
          |     *Q1      | CONNECT message after invalid escape        |
          |              | disabled                                    |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                  SET/DISPLAY ACCEPTED MSN                  |
          |------------------------------------------------------------|
          | Type:        | Configuration                               |
          |--------------+---------------------------------------------|
          | Format:      | AT [cmds] +IMSN(n, ?)=(s) [cmds]            |
          |--------------+---------------------------------------------|
          | Range:       | n=0,1                                       |
          |--------------+---------------------------------------------|
          | Description: | Limits acceptance to incoming calls with    |
          |              | target MSN                                  |
          |------------------------------------------------------------|
          |         Command          |            Function             |
          |--------------------------+---------------------------------|
          |         +IMSNn=s         | Store MSN                       |
          |--------------------------+---------------------------------|
          |         +IMSNn=          | Clear MSN                       |
          |--------------------------+---------------------------------|
          |          +IMSN?          | Display stored MSN              |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |          SET/DISPLAY D CHANNEL PROTOCOL (EUROPE)           |
          |------------------------------------------------------------|
          | Type:        | Configuration                               |
          |--------------+---------------------------------------------|
          | Format:      | AT [cmds] +IDP=(xxxx) [cmds]                |
          |--------------+---------------------------------------------|
          | Description: | Selects D channel protocol                  |
          |------------------------------------------------------------|
          |      Command      |                Function                |
          |-------------------+----------------------------------------|
          |    í+IDP=DSS1     | DSS1 protocol enabled                  |
          |-------------------+----------------------------------------|
          |     +IDP=1TR6     | 1TR6 protocol enabled                  |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |            SET/DISPLAY D CHANNEL PROTOCOL (USA)            |
          |------------------------------------------------------------|
          | Type:        | Configuration                               |
          |--------------+---------------------------------------------|
          | Format:      | AT [cmds] +IDP(?)=(xxxx, ?) [cmds]          |
          |--------------+---------------------------------------------|
          | Description: | Selects D channel protocol                  |
          |------------------------------------------------------------|
          |    Command    |                  Function                  |
          |---------------+--------------------------------------------|
          |  í+IDP=NI-1   | NI-1 protocol enabled                      |
          |---------------+--------------------------------------------|
          |   +IDP=AT&T   | AT&T 5ESS protocol enabled                 |
          |---------------+--------------------------------------------|
          |   +IDP=FV2N   | Group 2 leased line protocol enabled       |
          |               | (network side)                             |
          |---------------+--------------------------------------------|
          |   +IDP=FV2U   | Group 2 leased line protocol enabled (user |
          |               | side)                                      |
          |---------------+--------------------------------------------|
          |     +IDP?     | Display selected protocol                  |
          |---------------+--------------------------------------------|
          |    +IDP=?     | Display implemented protocols              |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                   SET/DISPLAY EAZ DIGIT                    |
          |------------------------------------------------------------|
          | Type:        | Configuration                               |
          |--------------+---------------------------------------------|
          | Format:      | AT [cmds] +IEAZ(?)=(n) [cmds]               |
          |--------------+---------------------------------------------|
          | Range        | 0-19, 255                                   |
          |--------------+---------------------------------------------|
          | Description: | Sets the EAZ terminal selection digit.      |
          |              | Characters 0-9 will select digits 0-9,      |
          |              | 10-19 will also select digits 0-9. 255      |
          |              | selects any digit for incoming calls, 0 for |
          |              | outgoing calls                              |
          |--------------+---------------------------------------------|
          | Note:        | Command is valid for German 1TR6 protocol   |
          |              | only                                        |
          |------------------------------------------------------------|
          |            Command            |          Function          |
          |-------------------------------+----------------------------|
          |            +IEAZ=n            | Store EAZ                  |
          |-------------------------------+----------------------------|
          |            +IEAZ?             | Display EAZ                |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                SET/DISPLAY DIRECTORY NUMBER                |
          |------------------------------------------------------------|
          | Type:        | Configuration                               |
          |--------------+---------------------------------------------|
          | Format:      | AT [cmds] +IDN(n, ?)=(s) [cmds]             |
          |--------------+---------------------------------------------|
          | Range:       | n=1,2 (B-channels), s=0-9                   |
          |--------------+---------------------------------------------|
          | Description: | Sets and displays directory numbers.        |
          |              | Directory number s can be up to 12          |
          |              | characters long                             |
          |------------------------------------------------------------|
          |      Command       |               Function                |
          |--------------------+---------------------------------------|
          |      +IDNn=s       | Set directory number                  |
          |--------------------+---------------------------------------|
          |       +IDNn=       | Clear directory number                |
          |--------------------+---------------------------------------|
          |       +IDNn?       | Display directory number              |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                      SET/DISPLAY MSN                       |
          |------------------------------------------------------------|
          | Type:        | Configuration                               |
          |--------------+---------------------------------------------|
          | Format:      | AT [cmds] +ICLI(n, ?, /)=(s) [cmds]         |
          |--------------+---------------------------------------------|
          | Range:       | s=0 - 9                                     |
          |--------------+---------------------------------------------|
          | Description: | Determines which multiple subscriber number |
          |              | is displayed to the remote side in outgoing |
          |              | calls as the originator address             |
          |------------------------------------------------------------|
          |    Command     |                 Function                  |
          |----------------+-------------------------------------------|
          |    +ICLI=s     | Store originator MSN                      |
          |----------------+-------------------------------------------|
          |    +ICLIn=     | Clear originator MSN                      |
          |----------------+-------------------------------------------|
          |    +ICLI=/     | Clear originator MSN; suppress display to |
          |                | remote side                               |
          |----------------+-------------------------------------------|
          |     +ICLI?     | Display stored originator MSN             |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                      SET/DISPLAY SPID                      |
          |------------------------------------------------------------|
          | Type:        | Configuration                               |
          |--------------+---------------------------------------------|
          | Format:      | AT [cmds] +ISPID(n, ?)=(s) [cmds]           |
          |--------------+---------------------------------------------|
          | Range:       | n=1,2 (B-channels)                          |
          |--------------+---------------------------------------------|
          | Description: | Sets and displays service profile ID        |
          |------------------------------------------------------------|
          |       Command       |               Function               |
          |---------------------+--------------------------------------|
          |      +ISPIDn=s      | Set service profile ID               |
          |---------------------+--------------------------------------|
          |      +ISPIDn=       | Clear service profile ID             |
          |---------------------+--------------------------------------|
          |      +ISPIDn?       | Display service profile ID           |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |            STORE NUMBERS FOR CLOSED USER GROUPS            |
          |------------------------------------------------------------|
          | Type:        | Configuration                               |
          |--------------+---------------------------------------------|
          | Format:      | AT [cmds] +ICLD(n, ?)=(s) [cmds]            |
          |--------------+---------------------------------------------|
          | Range:       | n=1 - 3                                     |
          |--------------+---------------------------------------------|
          | Description: | Restricts call acceptance to remote systems |
          |------------------------------------------------------------|
          |          Command          |            Function            |
          |---------------------------+--------------------------------|
          |         +ICLDn=s          | Store a call number            |
          |---------------------------+--------------------------------|
          |          +ICLDn=          | Clear a call number            |
          |---------------------------+--------------------------------|
          |          +ICDL?           | Clear stored numbers           |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                  VERBOSE CONNECT MESSAGES                  |
          |------------------------------------------------------------|
          | Type:        | Configuration                               |
          |--------------+---------------------------------------------|
          | Format:      | AT [cmds] -Mn [cmds]                        |
          |--------------+---------------------------------------------|
          | Description: | Controls text of verbose CONNECT messages   |
          |--------------+---------------------------------------------|
          |   Command    |                  Function                   |
          |--------------+---------------------------------------------|
          |     í-M0     | Verbose CONNECT messages dependant on AT\V  |
          |--------------+---------------------------------------------|
          |     -M1      | Verbose CONNECT messages independent of     |
          |              | AT\V                                        |
          +------------------------------------------------------------+
       
                                         
       
                               S(status) Registers
       
          +------------------------------------------------------------+
          |                  BIT-MAPPED REGISTER S14                   |
          |------------------------------------------------------------|
          | Format:       | AT [cmds] S14=n [cmds]                     |
          |---------------+--------------------------------------------|
          | Range:        | 0-174                                      |
          |---------------+--------------------------------------------|
          | Unit:         | Bit-mapped                                 |
          |---------------+--------------------------------------------|
          | Description:  | Controls echo, result codes and display,   |
          |               | dial mode, and answer/originate mode.      |
          |---------------+--------------------------------------------|
          | Bit  |  Dec.  |                  Function                  |
          |      | Value  |                                            |
          |------+--------+--------------------------------------------|
          |  0   |      0 | Not used                                   |
          |------+--------+--------------------------------------------|
          |  1   |      0 | Command echo disabled                      |
          |      |        |                                            |
          |      |      2 | Command echo enabled                       |
          |------+--------+--------------------------------------------|
          |  2   |      0 | Result codes enabled                       |
          |      |        |                                            |
          |      |      4 | Result codes disabled                      |
          |------+--------+--------------------------------------------|
          |  3   |      0 | Display result codes in numeric format     |
          |      |        |                                            |
          |      |      8 | Display result codes in verbose format     |
          |------+--------+--------------------------------------------|
          |  4   |      0 | Smart mode                                 |
          |      |        |                                            |
          |      |     16 | Dumb mode                                  |
          |------+--------+--------------------------------------------|
          |  5   |      0 | Bit rate detection enabled                 |
          |      |        |                                            |
          |      |     32 | Bit rate detection disabled                |
          |------+--------+--------------------------------------------|
          |  6   |      0 | Polling allowed during connection          |
          |      |        | establishment                              |
          |      |     64 |                                            |
          |      |        | Polling not allowed during connection      |
          |      |        | establishment                              |
          |------+--------+--------------------------------------------|
          |  7   |      0 | Answer mode enabled                        |
          |      |        |                                            |
          |      |    128 | Originate mode enabled                     |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                  BIT-MAPPED REGISTER S21                   |
          |------------------------------------------------------------|
          | Format        | AT [cmds] S21=n [cmds]                     |
          |---------------+--------------------------------------------|
          | Range:        | 0-253                                      |
          |---------------+--------------------------------------------|
          | Unit:         | Bit-mapped                                 |
          |---------------+--------------------------------------------|
          | Description:  | Selects jack type, CTS/DCD/DSR signals,    |
          |               | low DTR action, and the long space         |
          |               | disconnect function.                       |
          |---------------+--------------------------------------------|
          | Bit  |  Dec.  |                  Function                  |
          |      | Value  |                                            |
          |------+--------+--------------------------------------------|
          | 0,1  |      0 | Not used                                   |
          |------+--------+--------------------------------------------|
          |  2   |    í 0 | CTS follows RTS                            |
          |      |        |                                            |
          |      |      4 | CTS forced high                            |
          |------+--------+--------------------------------------------|
          | 4, 3 |      0 | DTR signal ignored                         |
          |      |        |                                            |
          |      |      8 | Modem goes to command mode on low DTR      |
          |      |        |                                            |
          |      |   í 16 | Modem disconnects on low DTR; Auto-Answer  |
          |      |        | is disabled.                               |
          |      |     24 |                                            |
          |      |        | Modem is initialized on low DTR            |
          |------+--------+--------------------------------------------|
          |  5   |      0 | DCD forced high                            |
          |      |        |                                            |
          |      |   í 32 | DCD normal                                 |
          |------+--------+--------------------------------------------|
          | 6,7  |      0 | Not used                                   |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                  BIT-MAPPED REGISTER S22                   |
          |------------------------------------------------------------|
          | Format             | AT [cmds] S22=n [cmds]                |
          |--------------------+---------------------------------------|
          | Range:             | 0-255                                 |
          |--------------------+---------------------------------------|
          | Unit:              | Bit-mapped                            |
          |--------------------+---------------------------------------|
          | Description:       | Limits results codes                  |
          |--------------------+---------------------------------------|
          |  Bit  | Dec. Value |               Function                |
          |-------+------------+---------------------------------------|
          |  0-3  |          0 | Not used                              |
          |-------+------------+---------------------------------------|
          | 6 - 4 |          0 | Busy line reported with NO CARRIER    |
          |       |            |                                       |
          |       |         64 | Busy line reported with NO CARRIER    |
          |       |            |                                       |
          |       |         80 | Busy line reported with NO CARRIER    |
          |       |            |                                       |
          |       |         96 | Busy line reported with BUSY          |
          |       |            |                                       |
          |       |      í 112 | Busy line reported with BUSY          |
          |-------+------------+---------------------------------------|
          |   7   |          0 | Not used                              |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                  BIT-MAPPED REGISTER S27                   |
          |------------------------------------------------------------|
          | Format        | AT [cmds] S27=n [cmds]                     |
          |---------------+--------------------------------------------|
          | Range:        | 0-111                                      |
          |---------------+--------------------------------------------|
          | Unit:         | Bit-mapped                                 |
          |---------------+--------------------------------------------|
          | Description:  | Selects synchronous/asynchronous mode, and |
          |               | line type                                  |
          |---------------+--------------------------------------------|
          | Bit  |  Dec.  |                  Function                  |
          |      | Value  |                                            |
          |------+--------+--------------------------------------------|
          | 1, 0 |    í 0 | Asynchronous mode                          |
          |      |        |                                            |
          |      |      1 | Synchronous mode                           |
          |      |        |                                            |
          |      |      2 | Synchronous operation, DTR dialing         |
          |------+--------+--------------------------------------------|
          | 2, 3 |    í 0 | Switched line                              |
          |      |        |                                            |
          |      |      4 | Group 0 leased line, manual connection     |
          |      |        | established                                |
          |      |      8 |                                            |
          |      |        | Group 0 leased line, automatic connection  |
          |      |        | established                                |
          |------+--------+--------------------------------------------|
          | 4-7  |      0 | Not used                                   |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                  BIT-MAPPED REGISTER S28                   |
          |------------------------------------------------------------|
          | Format            | AT [cmds] S28=n [cmds]                 |
          |-------------------+----------------------------------------|
          | Range:            | 0-31                                   |
          |-------------------+----------------------------------------|
          | Unit:             | Bit-mapped                             |
          |-------------------+----------------------------------------|
          | Description:      | Controls V.110 rate adaption           |
          |-------------------+----------------------------------------|
          | Bit  | Dec. Value |                Function                |
          |------+------------+----------------------------------------|
          | 0, 1 |          0 | Not used                               |
          |------+------------+----------------------------------------|
          | 2, 3 |          0 | V.110 bit rate adaptation enabled      |
          |      |            |                                        |
          |      |        í 4 | V.110 bit rate adaptation enabled      |
          |      |            |                                        |
          |      |          8 | V.110 bit rate adaptation disabled     |
          |      |            |                                        |
          |      |         12 | V.110 bit rate adaptation enabled      |
          |------+------------+----------------------------------------|
          | 4-7  |          0 | Not used                               |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                  BIT-MAPPED REGISTER S31                   |
          |------------------------------------------------------------|
          | Format            | AT [cmds] S31=n [cmds]                 |
          |-------------------+----------------------------------------|
          | Unit:             | Bit-mapped                             |
          |-------------------+----------------------------------------|
          | Description:      | Enables/disables DTR dialing           |
          |-------------------+----------------------------------------|
          | Bit  | Dec. Value |                Function                |
          |------+------------+----------------------------------------|
          | 0-4  |          0 | Not used                               |
          |------+------------+----------------------------------------|
          |  5   |        í 0 | DTR dialing enabled                    |
          |      |            |                                        |
          |      |         32 | DTR dialing disabled                   |
          |------+------------+----------------------------------------|
          | 6, 7 |          0 | Not used                               |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                  BIT-MAPPED REGISTER S36                   |
          |------------------------------------------------------------|
          | Type:         | Register                                   |
          |---------------+--------------------------------------------|
          | Format        | AT [cmds] S36=n [cmds]                     |
          |---------------+--------------------------------------------|
          | Description:  | Selects the action of the modem if it      |
          |               | fails to connect with the error-correction |
          |               | protocol set in &Q.                        |
          |---------------+--------------------------------------------|
          | Bit  |  Dec.  |                  Function                  |
          |      | Value  |                                            |
          |------+--------+--------------------------------------------|
          | 0-3  |      0 | Normal mode (V.110)                        |
          |------+--------+--------------------------------------------|
          |      |      1 | Direct mode (V.110)                        |
          |------+--------+--------------------------------------------|
          |      |      2 | X.75 mode                                  |
          |------+--------+--------------------------------------------|
          |      |      3 | X.75; fallback to V.110 mode               |
          |------+--------+--------------------------------------------|
          |      |      4 | V.120 mode                                 |
          |------+--------+--------------------------------------------|
          |      |      5 | V.120; fallback to V.110 mode              |
          |------+--------+--------------------------------------------|
          |      |      6 | X.75 or V.120 mode                         |
          |------+--------+--------------------------------------------|
          |      |    í 7 | X.75 or V.120; fallback to V.110 mode      |
          |------+--------+--------------------------------------------|
          |      |      8 | X.75 VT-100 mode (German T-Online service) |
          |------+--------+--------------------------------------------|
          |      |      9 | X.75 CEPT & KIT mode (German T-Online      |
          |      |        | service)                                   |
          |------+--------+--------------------------------------------|
          | 4-6  |      0 | Reserved                                   |
          |------+--------+--------------------------------------------|
          |  7   |    í 0 | Channel bundling disabled                  |
          |      |        |                                            |
          |      |    128 | Channel bundling enabled                   |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                  BIT-MAPPED REGISTER S37                   |
          |------------------------------------------------------------|
          | Type:         | Register                                   |
          |---------------+--------------------------------------------|
          | Format        | AT [cmds] S37=n [cmds]                     |
          |---------------+--------------------------------------------|
          | Description:  | Sets the maximum allowable ISDN line bit   |
          |               | rate in V.110 operation                    |
          |---------------+--------------------------------------------|
          | Bit  |  Dec.  |                  Function                  |
          |      | Value  |                                            |
          |------+--------+--------------------------------------------|
          | 0-4  |      5 | ISDN line bit rate at 1200bps              |
          |------+--------+--------------------------------------------|
          |      |      6 | ISDN line bit rate at 2400bps              |
          |------+--------+--------------------------------------------|
          |      |      7 | ISDN line bit rate at 4800bps              |
          |------+--------+--------------------------------------------|
          |      |      9 | ISDN line bit rate at 9600bps              |
          |------+--------+--------------------------------------------|
          |      |     13 | ISDN line bit rate at 19.2Kbps             |
          |------+--------+--------------------------------------------|
          |      |    í21 | ISDN line bit rate at 38.4Kbps             |
          |------+--------+--------------------------------------------|
          |      |     22 | ISDN line bit rate at 48.0Kbps             |
          |------+--------+--------------------------------------------|
          |      |     23 | ISDN line bit rate at 56.0Kbps             |
          |------+--------+--------------------------------------------|
          |      |     24 | ISDN line bit rate at 64.0Kbps             |
          |------+--------+--------------------------------------------|
          |  5   |      0 | Reserved                                   |
          |------+--------+--------------------------------------------|
          |  6   |     í0 | ISDN bit rate depends on serial port rate  |
          |      |        |                                            |
          |      |     64 | ISDN bit rate determined by %B             |
          |------+--------+--------------------------------------------|
          |  7   |     í0 | Fixed serial port rate                     |
          |      |        |                                            |
          |      |    128 | serial port rate adapted to ISDN line rate |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                  BIT-MAPPED REGISTER S46                   |
          |------------------------------------------------------------|
          | Type:            | Register                                |
          |------------------------------------------------------------|
          | Format:        | AT [cmds] S46=n [cmds]                    |
          |----------------+-------------------------------------------|
          | Description:   | Selects active error correction and       |
          |                | compression protocols                     |
          |------------------------------------------------------------|
          |    Bit    |  Dec.  |               Function                |
          |           | Value  |                                       |
          |-----------+--------+---------------------------------------|
          |    0-3    |      0 | Data compression disabled             |
          |-----------+--------+---------------------------------------|
          |           |      1 | V.42bis data compression enabled      |
          |-----------+--------+---------------------------------------|
          |           |      2 | V.42bis data compression enabled      |
          |-----------+--------+---------------------------------------|
          |           |    í 3 | V.42bis data compression enabled      |
          |-----------+--------+---------------------------------------|
          |    4-7    |      0 | Reserved                              |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                  BIT-MAPPED REGISTER S51                   |
          |------------------------------------------------------------|
          | Type:         | Register                                   |
          |---------------+--------------------------------------------|
          | Format        | AT [cmds] S51=n [cmds]                     |
          |---------------+--------------------------------------------|
          | Description:  | Sets flow control options                  |
          |---------------+--------------------------------------------|
          | Bit  |  Dec.  |                  Function                  |
          |      | Value  |                                            |
          |------+--------+--------------------------------------------|
          | 0-3  |      0 | No handshake                               |
          |------+--------+--------------------------------------------|
          |      |      1 | Bi-directional XON/XOFF flow control       |
          |      |        | enabled                                    |
          |------+--------+--------------------------------------------|
          |      |      2 | Unidirectional RTS/CTS flow control        |
          |      |        | enabled                                    |
          |------+--------+--------------------------------------------|
          |      |      3 | Bi-directional RTS/CTS flow control        |
          |      |        | enabled                                    |
          |------+--------+--------------------------------------------|
          |      |     í4 | Unidirectional XON/XOFF flow control by    |
          |      |        | DCE enabled                                |
          |------+--------+--------------------------------------------|
          |      |      5 | CTS flow control by DCE enabled. CTS low   |
          |      |        | until connection established               |
          |------+--------+--------------------------------------------|
          |      |      6 | Bi-directional RTS/CTS flow control        |
          |      |        | enabled. CTS low until connection          |
          |      |        | established                                |
          |------+--------+--------------------------------------------|
          |  4   |     í0 | XON/XOFF remote passthrough disabled       |
          |      |        |                                            |
          |      |     16 | XON/XOFF remote passthrough enabled        |
          |------+--------+--------------------------------------------|
          | 5-7  |      0 | Reserved                                   |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                  BIT-MAPPED REGISTER S52                   |
          |------------------------------------------------------------|
          | Type:         | Register                                   |
          |---------------+--------------------------------------------|
          | Format        | AT [cmds] S52=n [cmds]                     |
          |---------------+--------------------------------------------|
          | Description:  | Sets DSR, CTS, DCD options                 |
          |---------------+--------------------------------------------|
          | Bit  |  Dec.  |                  Function                  |
          |      | Value  |                                            |
          |------+--------+--------------------------------------------|
          | 0, 1 |     í0 | DSR forced high, CTS forced high           |
          |------+--------+--------------------------------------------|
          |      |      1 | DSR indicates B-channel switched through,  |
          |      |        | CTS forced high                            |
          |------+--------+--------------------------------------------|
          |      |      2 | DSR forced high, CTS follows DCD           |
          |------+--------+--------------------------------------------|
          |      |      3 | DSR indicates B-channel switched through,  |
          |      |        | CTS follows DCD                            |
          |------+--------+--------------------------------------------|
          | 2, 3 |     í0 | DCD either forced high, or indicates       |
          |      |        | existing connection ( depending on S21)    |
          |      |      8 |                                            |
          |      |        | DCD off for .5 seconds during connection   |
          |------+--------+--------------------------------------------|
          | 4,5  |     í0 | DSR forced high, CTS forced high           |
          |      |        |                                            |
          |      |     32 | DSR indicates B-channel switched through,  |
          |      |        | CTS forced high                            |
          |------+--------+--------------------------------------------|
          | 6,7  |      0 | CTS determined by \D                       |
          |      |        |                                            |
          |      |     64 | CTS follows RTS                            |
          |      |        |                                            |
          |      |    128 | CTS follows RTS after .5…6 seconds         |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                  BIT-MAPPED REGISTER S87                   |
          |------------------------------------------------------------|
          | Type:         | Register                                   |
          |---------------+--------------------------------------------|
          | Format        | AT [cmds] S87=n [cmds]                     |
          |---------------+--------------------------------------------|
          | Description:  | Read only register. Reports current bit    |
          |               | rate                                       |
          |---------------+--------------------------------------------|
          | Bit  |  Dec.  |                  Function                  |
          |      | Value  |                                            |
          |------+--------+--------------------------------------------|
          | 0-4  |      0 | No connection established                  |
          |------+--------+--------------------------------------------|
          |      |      4 | ISDN line bit rate at 1200bps              |
          |------+--------+--------------------------------------------|
          |      |      6 | ISDN line bit rate at 2400bps              |
          |------+--------+--------------------------------------------|
          |      |      7 | ISDN line bit rate at 4800bps              |
          |------+--------+--------------------------------------------|
          |      |      9 | ISDN line bit rate at 9600bps              |
          |------+--------+--------------------------------------------|
          |      |     13 | ISDN line bit rate at 19.2Kbps             |
          |------+--------+--------------------------------------------|
          |      |    í21 | ISDN line bit rate at 38.4Kbps             |
          |------+--------+--------------------------------------------|
          |      |     22 | ISDN line bit rate at 48.0Kbps             |
          |------+--------+--------------------------------------------|
          |      |     23 | ISDN line bit rate at 56.0Kbps             |
          |------+--------+--------------------------------------------|
          |      |     24 | ISDN line bit rate at 64.0Kbps             |
          |------+--------+--------------------------------------------|
          |  5   |     í0 | One-channel connection                     |
          |      |        |                                            |
          |      |     32 | 2nd ISDN connection with 128/112Kbps (2nd  |
          |      |        | B-channel with 56/64Kbps)                  |
          |------+--------+--------------------------------------------|
          | 6, 7 |      0 | Reserved                                   |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                  BIT-MAPPED REGISTER S93                   |
          |------------------------------------------------------------|
          | Type:             | Register                               |
          |-------------------+----------------------------------------|
          | Format            | AT [cmds] S93=n [cmds]                 |
          |-------------------+----------------------------------------|
          | Description:      | Determines serial port bit rate        |
          |-------------------+----------------------------------------|
          | Bit  | Dec. Value |                Function                |
          |------+------------+----------------------------------------|
          | 0-4  |          0 | No connection established              |
          |------+------------+----------------------------------------|
          |      |          5 | Serial port bit rate at 1200bps        |
          |------+------------+----------------------------------------|
          |      |          6 | Serial port bit rate at 2400bps        |
          |------+------------+----------------------------------------|
          |      |          7 | Serial port bit rate at 4800bps        |
          |------+------------+----------------------------------------|
          |      |          9 | Serial port bit rate at 9600bps        |
          |------+------------+----------------------------------------|
          |      |         13 | Serial port bit rate at 19.2Kbps       |
          |------+------------+----------------------------------------|
          |      |        í21 | Serial port bit rate at 38.4Kbps       |
          |------+------------+----------------------------------------|
          |      |         22 | Serial port bit rate at 48.0Kbps       |
          |------+------------+----------------------------------------|
          |      |         23 | Serial port bit rate at 56.0Kbps       |
          |------+------------+----------------------------------------|
          |      |         24 | Serial port bit rate at 64.0Kbps       |
          |------+------------+----------------------------------------|
          |  5   |          0 | Reserved                               |
          |------+------------+----------------------------------------|
          | 6, 7 |          0 | Data format 8N1                        |
          |      |            |                                        |
          |      |         64 | Data format 7E1                        |
          |      |            |                                        |
          |      |        128 | Data format 7O1                        |
          |      |            |                                        |
          |      |        192 | Data format 7N2                        |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                  BIT-MAPPED REGISTER S95                   |
          |------------------------------------------------------------|
          | Type:         | Register                                   |
          |---------------+--------------------------------------------|
          | Format        | AT [cmds] S95=n [cmds]                     |
          |---------------+--------------------------------------------|
          | Description:  | Determines result codes                    |
          |---------------+--------------------------------------------|
          | Bit  |  Dec.  |                  Function                  |
          |      | Value  |                                            |
          |------+--------+--------------------------------------------|
          | 0-3  |      0 | No modified CONNECT messages               |
          |------+--------+--------------------------------------------|
          |      |      1 | Indicates error-corrected connections      |
          |------+--------+--------------------------------------------|
          |      |      2 | Indicates error-corrected connections and  |
          |      |        | error correction method                    |
          |------+--------+--------------------------------------------|
          |      |     í8 | Extensive CONNECT result codes             |
          |------+--------+--------------------------------------------|
          |  4   |     í0 | CONNECT messages with bit rate             |
          |      |        |                                            |
          |      |     16 | CONNECT messages without bit rate          |
          |------+--------+--------------------------------------------|
          |  5   |     í0 | CONNECT messages after invalid escape      |
          |      |        | sequence                                   |
          |      |     32 |                                            |
          |      |        | No CONNECT messages after invalid escape   |
          |      |        | sequence                                   |
          |------+--------+--------------------------------------------|
          | 6, 7 |     í0 | Result codes enabled or disabled           |
          |      |        | (depending on S14)                         |
          |      |    128 |                                            |
          |      |        | Result codes disabled in answer mode       |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                  BIT-MAPPED REGISTER S96                   |
          |------------------------------------------------------------|
          | Type:         | Register                                   |
          |---------------+--------------------------------------------|
          | Format        | AT [cmds] S96=n [cmds]                     |
          |---------------+--------------------------------------------|
          | Description:  | Sets AT command interpreter                |
          |---------------+--------------------------------------------|
          | Bit  |  Dec.  |                  Function                  |
          |      | Value  |                                            |
          |------+--------+--------------------------------------------|
          | 0,1  |      0 | Reserved                                   |
          |------+--------+--------------------------------------------|
          |  2   |     í0 | Message ‘Press any key to continue’        |
          |      |        | enabled                                    |
          |------+--------+--------------------------------------------|
          |      |      4 | Message ‘Press any key to continue’        |
          |      |        | disabled                                   |
          |------+--------+--------------------------------------------|
          | 3,4  |     í0 | German user interface (European default)   |
          |      |        |                                            |
          |      |      8 | English user interface (US default)        |
          |      |        |                                            |
          |      |     16 | Reserved                                   |
          |      |        |                                            |
          |      |     24 | Reserved                                   |
          |------+--------+--------------------------------------------|
          | 5,6  |      0 | Reserved                                   |
          |------+--------+--------------------------------------------|
          |  7   |     í0 | Disable error message for access of        |
          |      |        | invalid or protected S register (® OK)     |
          |      |    128 |                                            |
          |      |        | Enable error message for access of invalid |
          |      |        | or protected S register (® ERROR)          |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                  BIT-MAPPED REGISTER S151                  |
          |------------------------------------------------------------|
          | Type:         | Register                                   |
          |---------------+--------------------------------------------|
          | Format        | AT [cmds] S151=n [cmds]                    |
          |---------------+--------------------------------------------|
          | Description:  | Controls ISDN D channel                    |
          |---------------+--------------------------------------------|
          | Bit  |  Dec.  |                  Function                  |
          |      | Value  |                                            |
          |------+--------+--------------------------------------------|
          |  0   |     í0 | Send error result code to network if       |
          |      |        | device is busy or not ready                |
          |      |      1 |                                            |
          |      |        | Do not send error result code to network   |
          |      |        | if device is busy or not ready             |
          |------+--------+--------------------------------------------|
          |  1   |     í0 | Incoming calls confirmed with ALERT        |
          |------+--------+--------------------------------------------|
          |      |      1 | No ALERT for incoming calls                |
          |------+--------+--------------------------------------------|
          |  2   |     í0 | V.120: LLC (low layer capability) not      |
          |      |        | signaled in D-channel                      |
          |      |      4 |                                            |
          |      |        | V.110: BC (bearer capability) and LLC not  |
          |      |        | signaled in D-channel                      |
          |      |        |                                            |
          |      |        | V.120: LLC (low layer capability) signaled |
          |      |        | in D-channel                               |
          |      |        |                                            |
          |      |        | V.110: BC (bearer capability) and LLC      |
          |      |        | signaled in D-channel                      |
          |------+--------+--------------------------------------------|
          |  3   |      0 | Reserved                                   |
          |------+--------+--------------------------------------------|
          |  4   |      0 | Incoming calls on B-channel 1 will be      |
          |      |        | accepted                                   |
          |      |     16 |                                            |
          |      |        | Incoming calls on B-channel 1 will be      |
          |      |        | ignored                                    |
          |------+--------+--------------------------------------------|
          |  5   |      0 | Incoming calls on B-channel 2 will be      |
          |      |        | accepted                                   |
          |      |     32 |                                            |
          |      |        | Incoming calls on B-channel 2 will be      |
          |      |        | ignored                                    |
          |------+--------+--------------------------------------------|
          | 6,7  |      0 | Reserved                                   |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                  BIT-MAPPED REGISTER S153                  |
          |------------------------------------------------------------|
          | Type:         | Register                                   |
          |---------------+--------------------------------------------|
          | Format        | AT [cmds] S153=n [cmds]                    |
          |---------------+--------------------------------------------|
          | Description:  | Controls CONNECT/NO CARRIER message        |
          |               | options                                    |
          |---------------+--------------------------------------------|
          | Bit  |  Dec.  |                  Function                  |
          |      | Value  |                                            |
          |------+--------+--------------------------------------------|
          |  0   |     í0 | Remote number is not displayed after       |
          |      |        | CONNECT                                    |
          |      |      1 |                                            |
          |      |        | Remote number is displayed after CONNECT   |
          |------+--------+--------------------------------------------|
          |  1   |     í0 | Remote number is not displayed after RING  |
          |      |        |                                            |
          |      |      2 | Remote number is displayed after RING      |
          |------+--------+--------------------------------------------|
          |  2   |     í0 | MSN/EAZ dialed by the remote side is not   |
          |      |        | displayed                                  |
          |------+--------+--------------------------------------------|
          |      |      4 | MSN/EAZ dialed by the remote side is       |
          |      |        | displayed if bit 0 and/or 1=1              |
          |------+--------+--------------------------------------------|
          | 3-5  |      0 | Reserved                                   |
          |------+--------+--------------------------------------------|
          |  6   |     í0 | Result codes are not displayed             |
          |      |        |                                            |
          |      |     64 | Result codes are displayed                 |
          |------+--------+--------------------------------------------|
          |  7   |     í0 | Disconnect reason not displayed            |
          |      |        |                                            |
          |      |    128 | Disconnect reason reported after NO        |
          |      |        | CARRIER according to S154/S155             |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                  BIT-MAPPED REGISTER S158                  |
          |------------------------------------------------------------|
          | Type:         | Register                                   |
          |---------------+--------------------------------------------|
          | Format        | AT [cmds] S158=n [cmds]                    |
          |---------------+--------------------------------------------|
          | Description:  | Controls CONNECT/NO CARRIER message        |
          |               | options                                    |
          |---------------+--------------------------------------------|
          | Bit  |  Dec.  |                  Function                  |
          |      | Value  |                                            |
          |------+--------+--------------------------------------------|
          |  0   |    í00 | No connection was established              |
          |      |        |                                            |
          |      |     01 | Current/last connection on B-channel 1     |
          |      |        |                                            |
          |      |     02 | Current/last connection on B-channel 2     |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                  BIT-MAPPED REGISTER S159                  |
          |------------------------------------------------------------|
          | Type:             | Register                               |
          |-------------------+----------------------------------------|
          | Format            | AT [cmds] S159=n [cmds]                |
          |-------------------+----------------------------------------|
          | Description:      | Shows current status of ISDN interface |
          |-------------------+----------------------------------------|
          | Bit  | Dec. Value |                Function                |
          |------+------------+----------------------------------------|
          |  0   |         í0 | No power on S0  bus detected           |
          |      |            |                                        |
          |      |          1 | Normal or restricted power on S0  bus  |
          |------+------------+----------------------------------------|
          |  1   |          0 | Reserved                               |
          |------+------------+----------------------------------------|
          |  2   |          0 | S0  bus not activated                  |
          |      |            |                                        |
          |      |          4 | S0  bus activated                      |
          |------+------------+----------------------------------------|
          |  3   |          0 | No TEI assigned                        |
          |      |            |                                        |
          |      |          8 | TEI assigned                           |
          |------+------------+----------------------------------------|
          | 4-7  |          0 | Reserved                               |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                  BIT-MAPPED REGISTER S160                  |
          |------------------------------------------------------------|
          | Type:        | Register (read only)                        |
          |--------------+---------------------------------------------|
          | Format       | AT [cmds] S160=n [cmds]                     |
          |--------------+---------------------------------------------|
          | Description: | Shows information about last call on ISDN   |
          |              | interface                                   |
          |--------------+---------------------------------------------|
          | Value (Hex)  |                  Function                   |
          |--------------+---------------------------------------------|
          |     00h      | No incoming call                            |
          |--------------+---------------------------------------------|
          |     10h      | Call is currently being reported            |
          |--------------+---------------------------------------------|
          |     11h      | Call accepted                               |
          |--------------+---------------------------------------------|
          |     12h      | Call withdrawn or answered by another       |
          |              | device on the S0  bus                       |
          |--------------+---------------------------------------------|
          |     20h      | Call had wrong bearer capability or service |
          |              | indicator                                   |
          |--------------+---------------------------------------------|
          |     21h      | Call had wrong MSN or EAZ                   |
          |--------------+---------------------------------------------|
          |     30h      | DTR was off, call was rejected              |
          |--------------+---------------------------------------------|
          |     31h      | ISDN adapter was already connected or       |
          |              | establishing another connection             |
          |--------------+---------------------------------------------|
          |     40h      | Number check not OK                         |
          |--------------+---------------------------------------------|
          |     41h      | Number check not OK, no number was given    |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                  BIT-MAPPED REGISTER S162                  |
          |------------------------------------------------------------|
          | Type:         | Register                                   |
          |---------------+--------------------------------------------|
          | Format        | AT [cmds] S162=n [cmds]                    |
          |---------------+--------------------------------------------|
          | Description:  | Selects preferred B-channel                |
          |---------------+--------------------------------------------|
          | Bit  |  Dec.  |                  Function                  |
          |      | Value  |                                            |
          |------+--------+--------------------------------------------|
          | 0,1  |     í0 | Any B-channel is used: Leased line         |
          |      |        | operation: B1 channel is used              |
          |      |      1 |                                            |
          |      |        | B1 channel has priority                    |
          |      |      2 |                                            |
          |      |        | B2 channel has priority                    |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                  BIT-MAPPED REGISTER S171                  |
          |------------------------------------------------------------|
          | Type:         | Register                                   |
          |---------------+--------------------------------------------|
          | Format        | AT [cmds] S171=n [cmds]                    |
          |---------------+--------------------------------------------|
          | Description:  | Specifies details of X.75 protocol         |
          |---------------+--------------------------------------------|
          | Bit  |  Dec.  |                  Function                  |
          |      | Value  |                                            |
          |------+--------+--------------------------------------------|
          | 0-2  |     í0 | Data block size 128 bytes                  |
          |      |        |                                            |
          |      |      1 | Data block size 256 bytes                  |
          |      |        |                                            |
          |      |      2 | Data block size 512 bytes                  |
          |      |        |                                            |
          |      |      3 | Data block size 1024 bytes                 |
          |      |        |                                            |
          |      |      4 | Data block size 2048 bytes                 |
          |------+--------+--------------------------------------------|
          |  3   |      0 | Reserved                                   |
          |------+--------+--------------------------------------------|
          |  4   |      0 | Async/sync conversion for PPP disabled     |
          |      |        |                                            |
          |      |     16 | Async/sync conversion for PPP enabled      |
          |------+--------+--------------------------------------------|
          |  5   |      0 | 64Kbps (Europe default)                    |
          |      |        |                                            |
          |      |     32 | 56Kbps (US default)                        |
          |------+--------+--------------------------------------------|
          | 6,7  |     í0 | T.70NL header disabled                     |
          |      |        |                                            |
          |      |     64 | T.70NL header disabled                     |
          |      |        |                                            |
          |      |    128 | T.70NL header enabled. Block size reduced  |
          |      |        | by 2 bytes                                 |
          |      |    192 |                                            |
          |      |        | T.70NL header enabled. Block size extended |
          |      |        | by 2 bytes                                 |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                  BIT-MAPPED REGISTER S172                  |
          |------------------------------------------------------------|
          | Type:             | Register                               |
          |-------------------+----------------------------------------|
          | Format            | AT [cmds] S172=n [cmds]                |
          |-------------------+----------------------------------------|
          | Description:      | Specifies details of V.120 protocol    |
          |-------------------+----------------------------------------|
          | Bit  | Dec. Value |                Function                |
          |------+------------+----------------------------------------|
          |  0   |         í0 | Data block size 127 bytes              |
          |      |            |                                        |
          |      |          1 | Data block size 259 bytes              |
          |------+------------+----------------------------------------|
          | 1-6  |          0 | Reserved                               |
          |------+------------+----------------------------------------|
          |  7   |         í0 | 64Kbps (Europe default)                |
          |      |            |                                        |
          |      |        128 | 56Kbps (US default)                    |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                  BIT-MAPPED REGISTER S173                  |
          |------------------------------------------------------------|
          | Type:         | Register                                   |
          |---------------+--------------------------------------------|
          | Format        | AT [cmds] S173=n [cmds]                    |
          |---------------+--------------------------------------------|
          | Description:  | Specifies details of V.110 protocol        |
          |---------------+--------------------------------------------|
          | Bit  |  Dec.  |                  Function                  |
          |      | Value  |                                            |
          |------+--------+--------------------------------------------|
          |  0   |      0 | Reserved                                   |
          |------+--------+--------------------------------------------|
          | 1-2  |      0 | No parity, asynchronous                    |
          |      |        |                                            |
          |      |      2 | Odd parity, asynchronous                   |
          |      |        |                                            |
          |      |      4 | Even parity, asynchronous                  |
          |      |        |                                            |
          |      |      6 | "1" parity, asynchronous                   |
          |------+--------+--------------------------------------------|
          |  3   |     í0 | RTS, DCD, DSR normal operations            |
          |      |        |                                            |
          |      |      8 | V.110 half duplex operation, asynchronous  |
          |------+--------+--------------------------------------------|
          |  4   |     í0 | Bit rate tolerance 12.5%, asynchronous     |
          |      |        |                                            |
          |      |     16 | Bit rate tolerance 25%, asynchronous       |
          |------+--------+--------------------------------------------|
          |  5   |     í0 | 1 stop bit, asynchronous                   |
          |      |        |                                            |
          |      |     32 | 2 stop bit 2, asynchronous                 |
          |------+--------+--------------------------------------------|
          | 6-7  |     í0 | 8 bits/character, asynchronous (no parity  |
          |      |        | bit)                                       |
          |      |     64 |                                            |
          |      |        | 7 bits/character, asynchronous (no parity  |
          |      |    128 | bit)                                       |
          |      |        |                                            |
          |      |    192 | 6 bits/character, asynchronous (no parity  |
          |      |        | bit)                                       |
          |      |        |                                            |
          |      |        | 5 bits/character, asynchronous (no parity  |
          |      |        | bit)                                       |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                  BIT-MAPPED REGISTER S175                  |
          |------------------------------------------------------------|
          | Type:         | Register                                   |
          |---------------+--------------------------------------------|
          | Format        | AT [cmds] S175=n [cmds]                    |
          |---------------+--------------------------------------------|
          | Description:  | Controls additional settings for channel   |
          |               | bundling                                   |
          |---------------+--------------------------------------------|
          | Bit  |  Dec.  |                  Function                  |
          |      | Value  |                                            |
          |------+--------+--------------------------------------------|
          | 0,1  |      0 | Reserved                                   |
          |------+--------+--------------------------------------------|
          |  2   |     í0 | Static channel bundling (second B-channel  |
          |      |        | always active)                             |
          |      |      4 |                                            |
          |      |        | Dynamic channel bundling (second B-channel |
          |      |        | active when needed)                        |
          |------+--------+--------------------------------------------|
          |  3   |     í0 | Connection hold time starts when           |
          |      |        | throughput falls below limit               |
          |      |      8 |                                            |
          |      |        | Connection hold time starts with each      |
          |      |        | charge unit                                |
          |------+--------+--------------------------------------------|
          |  4   |     í0 | Secondary connection with the same number  |
          |      |        | as primary connection                      |
          |      |     16 |                                            |
          |      |        | Secondary connection with the same number  |
          |      |        | as primary connection without SPC flag     |
          |------+--------+--------------------------------------------|
          |  5   |     í0 | Supplied number not required for           |
          |      |        | identification of second B-channel         |
          |      |     32 |                                            |
          |      |        | Supplied number required for               |
          |      |        | identification of second B-channel         |
          |------+--------+--------------------------------------------|
          |  6   |     í0 | CONNECT reported after primary connection  |
          |      |        | establishment                              |
          |      |     64 |                                            |
          |      |        | CONNECT reported after secondary           |
          |      |        | connection establishment                   |
          |------+--------+--------------------------------------------|
          |  7   |     í0 | Normal DSR function                        |
          |      |        |                                            |
          |      |    128 | DSR off when secondary connection          |
          |      |        | established                                |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                   CALL INDICATION DELAY                    |
          |------------------------------------------------------------|
          | Type:        | Register                                    |
          |--------------+---------------------------------------------|
          | Format       | AT [cmds] S152=n [cmds]                     |
          |--------------+---------------------------------------------|
          | Range:       | 0-50                                        |
          |--------------+---------------------------------------------|
          | Unit:        | 10ms                                        |
          |--------------+---------------------------------------------|
          | Description: | Sets the delay for indication of incoming   |
          |              | calls                                       |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                 CHANNEL BUNDLING HOLD TIME                 |
          |------------------------------------------------------------|
          | Type        | Register                                     |
          |-------------+----------------------------------------------|
          | Format      | AT [cmds] S178=n [cmds]                      |
          |-------------+----------------------------------------------|
          | Range       | 0-255 x 10                                   |
          |-------------+----------------------------------------------|
          | Unit        | 10sec                                        |
          |-------------+----------------------------------------------|
          | Description | Defines amount of time the second B channel  |
          |             | is held after the throughput falls below the |
          |             | limit set in register S176. Register used    |
          |             | only if bit 2 of Register S175 is set.       |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |           CHANNEL BUNDLING THROUGHPUT AVERAGING            |
          |------------------------------------------------------------|
          | Type        | Register                                     |
          |-------------+----------------------------------------------|
          | Format      | AT [cmds] S177=n [cmds]                      |
          |-------------+----------------------------------------------|
          | Range       | 0-32                                         |
          |-------------+----------------------------------------------|
          | Unit        | 1sec                                         |
          |-------------+----------------------------------------------|
          | Description | Defines time over which the average data     |
          |             | throughput is calculated in order to smooth  |
          |             | fluctuations throughout. Default=0           |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |             CHANNEL BUNDLING THROUGHPUT LIMIT              |
          |------------------------------------------------------------|
          | Type        | Register                                     |
          |-------------+----------------------------------------------|
          | Format      | AT [cmds] S176=n [cmds]                      |
          |-------------+----------------------------------------------|
          | Range       | 0-255 x 100                                  |
          |-------------+----------------------------------------------|
          | Unit        | 100 bytes/sec                                |
          |-------------+----------------------------------------------|
          | Description | Defines data throughput limit that must be   |
          |             | exceeded for second B-channel to be          |
          |             | established. Register used only if bit 2 of  |
          |             | Register S175 is set.                        |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |              CHARGE UNITS - CURRENT (EUROPE)               |
          |------------------------------------------------------------|
          | Type        | Register                                     |
          |-------------+----------------------------------------------|
          | Format      | AT [cmds] S191=n [cmds]                      |
          |-------------+----------------------------------------------|
          | Range       | 10                                           |
          |-------------+----------------------------------------------|
          | Unit        | ASCII                                        |
          |-------------+----------------------------------------------|
          | Description | Contains number of charge units or total     |
          |             | charge for current or last connection        |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |               CHARGE UNITS - TOTAL (EUROPE)                |
          |------------------------------------------------------------|
          | Type        | Register                                     |
          |-------------+----------------------------------------------|
          | Format      | AT [cmds] S192=n [cmds]                      |
          |-------------+----------------------------------------------|
          | Range       | 10                                           |
          |-------------+----------------------------------------------|
          | Unit        | ASCII                                        |
          |-------------+----------------------------------------------|
          | Description | Contains total number of charge units or     |
          |             | total charge for all previous connections.   |
          |             |                                              |
          |             | 0 resets register                            |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                       CHARGED UNITS                        |
          |------------------------------------------------------------|
          | Type        | Register                                     |
          |-------------+----------------------------------------------|
          | Format      | AT [cmds] S167=n [cmds]                      |
          |-------------+----------------------------------------------|
          | Range       | 0-255                                        |
          |-------------+----------------------------------------------|
          | Unit        | 10                                           |
          |-------------+----------------------------------------------|
          | Description | Sets the maximum number of charged units     |
          |             | which my be used within a certain number of  |
          |             | days set in register S168                    |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |              DATA PACKET REPITITIONS RECEIVED              |
          |------------------------------------------------------------|
          | Type:        | Register                                    |
          |--------------+---------------------------------------------|
          | Format       | AT [cmds] S156=n [cmds]                     |
          |--------------+---------------------------------------------|
          | Range:       | 0-255                                       |
          |--------------+---------------------------------------------|
          | Description: | Shows the ratio of repetitions per 250 data |
          |              | packets received on the control channel     |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                DATA PACKET REPITITIONS SENT                |
          |------------------------------------------------------------|
          | Type:        | Register                                    |
          |--------------+---------------------------------------------|
          | Format       | AT [cmds] S157=n [cmds]                     |
          |--------------+---------------------------------------------|
          | Range:       | 0-255                                       |
          |--------------+---------------------------------------------|
          | Description: | Shows the ratio of repetitions per 250 data |
          |              | packets sent on the control channel         |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                  ERROR CODES (EURO-ISDN)                   |
          |------------------------------------------------------------|
          | Type:        | Register (read only)                        |
          |--------------+---------------------------------------------|
          | Format       | AT [cmds] S165=n [cmds]                     |
          |--------------+---------------------------------------------|
          | Description: | Displays detailed error codes               |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                       ERROR LOCATION                       |
          |------------------------------------------------------------|
          | Type:        | Register (read only)                        |
          |--------------+---------------------------------------------|
          | Format       | AT [cmds] S154=n [cmds]                     |
          |--------------+---------------------------------------------|
          | Description: | Error code indicates location where the     |
          |              | error occurred. Error codes unidentified    |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                        ERROR REASON                        |
          |------------------------------------------------------------|
          | Type:        | Register (read only)                        |
          |--------------+---------------------------------------------|
          | Format       | AT [cmds] S155=n [cmds]                     |
          |--------------+---------------------------------------------|
          | Description: | Error code indicates reason for failure.    |
          |              | Error codes unidentified                    |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                     LAST CALL MSN/EAZ                      |
          |------------------------------------------------------------|
          | Type        | Register                                     |
          |-------------+----------------------------------------------|
          | Format      | AT [cmds] S193=n [cmds]                      |
          |-------------+----------------------------------------------|
          | Range       | 10                                           |
          |-------------+----------------------------------------------|
          | Unit        | ASCII                                        |
          |-------------+----------------------------------------------|
          | Description | Contains the multiple subscriber number      |
          |             | (MSN, with DSS1 protocol) or the EAZ         |
          |             | (terminal selection digit, with 1TR6         |
          |             | protocol) dialed by remote side for last     |
          |             | incoming call. 0 clears register             |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                LEASED LINE CONNECTION DELAY                |
          |------------------------------------------------------------|
          | Type:        | Register                                    |
          |--------------+---------------------------------------------|
          | Format       | AT [cmds] S40=n [cmds]                      |
          |--------------+---------------------------------------------|
          | Range:       | 5-255                                       |
          |--------------+---------------------------------------------|
          | Unit:        | 10 secondS                                  |
          |--------------+---------------------------------------------|
          | Description: | Controls the amount of time before the ISDN |
          |              | terminal adapter automatically establishes  |
          |              | a group 0 leased line connection            |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                  REMAINING CHARGED UNITS                   |
          |------------------------------------------------------------|
          | Type        | Register                                     |
          |-------------+----------------------------------------------|
          | Format      | AT [cmds] S169=n [cmds]                      |
          |-------------+----------------------------------------------|
          | Range       | 0-255                                        |
          |-------------+----------------------------------------------|
          | Unit        | 10                                           |
          |-------------+----------------------------------------------|
          | Description | Holds the number of charged units which can  |
          |             | still be used in the cost monitoring period. |
          |             | 0 disables                                   |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                   REMAINING TIME PERIOD                    |
          |------------------------------------------------------------|
          | Type        | Register                                     |
          |-------------+----------------------------------------------|
          | Format      | AT [cmds] S170=n [cmds]                      |
          |-------------+----------------------------------------------|
          | Range       | 0-255                                        |
          |-------------+----------------------------------------------|
          | Description | Holds the number of days remaining until the |
          |             | number of charged units is reset to the      |
          |             | maximum limit set in S167.                   |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                       REMOTE NUMBER                        |
          |------------------------------------------------------------|
          | Type        | Register                                     |
          |-------------+----------------------------------------------|
          | Format      | AT [cmds] S190=n [cmds]                      |
          |-------------+----------------------------------------------|
          | Range       | 36                                           |
          |-------------+----------------------------------------------|
          | Unit        | ASCII                                        |
          |-------------+----------------------------------------------|
          | Description | Contains ISDN number of current or last      |
          |             | remote system. 0 resets register             |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                     SERVICE INDICATOR                      |
          |------------------------------------------------------------|
          | Type:        | Register (read only)                        |
          |--------------+---------------------------------------------|
          | Format       | AT [cmds] S163=n [cmds]                     |
          |--------------+---------------------------------------------|
          | Description: | Shows service indicator of last incoming    |
          |              | call. 007 indicates a bit rate adaptation   |
          |              | to 56Kbps. Otherwise, the data transfer     |
          |              | occurred at 64Kbps.                         |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                     SERVICE INDICATOR                      |
          |------------------------------------------------------------|
          | Type:        | Register (read only)                        |
          |--------------+---------------------------------------------|
          | Format       | AT [cmds] S164=n [cmds]                     |
          |--------------+---------------------------------------------|
          | Description: | Shows service indicator of last incoming    |
          |              | call. 169 indicates a bit rate adaptation   |
          |              | to 56Kbps. Otherwise, the data transfer     |
          |              | occurred at 64Kbps.                         |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |              TIME PERIOD FOR COST MONITORING               |
          |------------------------------------------------------------|
          | Type        | Register                                     |
          |-------------+----------------------------------------------|
          | Format      | AT [cmds] S168=n [cmds]                      |
          |-------------+----------------------------------------------|
          | Range       | 0-255                                        |
          |-------------+----------------------------------------------|
          | Description | Sets the maximum number of days the charged  |
          |             | units set in S167 may be used                |
          +------------------------------------------------------------+