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       # PUREDATA, LTD.
       
          SATISFAXTION MODEM/300
       
          Modem Type                  Data (asynchronous)/Fax            
          Maximum Data Rate           14.4Kbps                           
          Maximum Fax Rate            9600bps                            
          Data Bus                    8-bit ISA                          
          Fax Class                   Class I                            
          Data Modulation Protocol    Bell 103A/212A                     
                                                                         
                                      ITU-T V.22, V.22bis, V.32, V.32bis 
          Fax Modulation Protocol     ITU-T V.27ter, V.29                
          Error                       MNP5, V.42, V.42bis                
          Correction/Compression      
       
   IMG IMG 1
          
       
          +------------------------------------------------------------+
          |                        CONNECTIONS                         |
          |------------------------------------------------------------|
          |      Purpose      | Location |     Purpose      | Location |
          |-------------------+----------+------------------+----------|
          | Line out          |   CN1    | Line in          |   CN2    |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                 BASE I/O ADDRESS SELECTION                 |
          |------------------------------------------------------------|
          |        Port        |       SW1/A       |       SW1/B       |
          |--------------------+-------------------+-------------------|
          | COM1: (3F8h)       |        On         |        On         |
          |--------------------+-------------------+-------------------|
          | » COM2: (2F8h)     |        Off        |        On         |
          |--------------------+-------------------+-------------------|
          | COM3: (3E8h)       |        On         |        Off        |
          |--------------------+-------------------+-------------------|
          | COM4: (2E8h)       |        Off        |        Off        |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                    INTERRUPT SELECTION                     |
          |------------------------------------------------------------|
          |   IRQ    |   SW1/C    |   SW1/D    |   SW1/E   |   SW1/F   |
          |----------+------------+------------+-----------+-----------|
          | 2        |     On     |    Off     |    Off    |    Off    |
          |----------+------------+------------+-----------+-----------|
          | » 3      |    Off     |     On     |    Off    |    Off    |
          |----------+------------+------------+-----------+-----------|
          | 4        |    Off     |    Off     |    On     |    Off    |
          |----------+------------+------------+-----------+-----------|
          | 5        |    Off     |    Off     |    Off    |    On     |
          +------------------------------------------------------------+
       
                            Proprietary AT Command Set
       
          +------------------------------------------------------------+
          |                    ACCEPT RELIABLE MODE                    |
          |------------------------------------------------------------|
          | Type:        | Immediate                                   |
          |--------------+---------------------------------------------|
          | Format:      | AT [cmds] \Un                               |
          |--------------+---------------------------------------------|
          | Example:     | AT \U<CR>                                   |
          |--------------+---------------------------------------------|
          | Description: | Accepts remote modem’s request for reliable |
          |              | link.                                       |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |            AUTO-RETRAIN - FALLBACK/FALLFORWARD             |
          |------------------------------------------------------------|
          | Type:        | Configuration                               |
          |--------------+---------------------------------------------|
          | Format:      | AT [cmds] %En [cmds]                        |
          |--------------+---------------------------------------------|
          | Example:     | AT %E1 <CR>                                 |
          |--------------+---------------------------------------------|
          | Description: | Controls auto-retrain mode and              |
          |              | fallback/fall forward.                      |
          |--------------+---------------------------------------------|
          | Command      |                  Function                   |
          |--------------+---------------------------------------------|
          | %E0          | Auto-retrain disabled.                      |
          |--------------+---------------------------------------------|
          | » %E1        | Auto-retrain enabled.                       |
          |--------------+---------------------------------------------|
          | %E2          | Fallback/fall forward enabled.              |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                  BIT-MAPPED REGISTER S14                   |
          |------------------------------------------------------------|
          | Format          | AT [cmds] S14? [cmds]                    |
          |-----------------+------------------------------------------|
          | Example:        | ATS14?<CR>                               |
          |-----------------+------------------------------------------|
          | Default:        | Read only                                |
          |-----------------+------------------------------------------|
          | Range:          | 0-255                                    |
          |-----------------+------------------------------------------|
          | Unit:           | Bit-mapped.                              |
          |-----------------+------------------------------------------|
          | Description:    | Displays echo, result codes, result code |
          |                 | display, dial mode, and answer/originate |
          |                 | mode.                                    |
          |------------------------------------------------------------|
          |   Bit    | Value      |              Function              |
          |----------+------------+------------------------------------|
          |    0     | 1          | Not used.                          |
          |----------+------------+------------------------------------|
          |    1     | 0 » 1      | Command echo disabled.             |
          |          |            |                                    |
          |          |            | Command echo enabled.              |
          |----------+------------+------------------------------------|
          |    2     | » 0 1      | Result codes enabled.              |
          |          |            |                                    |
          |          |            | Result codes disabled.             |
          |----------+------------+------------------------------------|
          |    3     | 0 » 1      | Display result codes in numeric    |
          |          |            | format.                            |
          |          |            |                                    |
          |          |            | Display result codes in verbose    |
          |          |            | format.                            |
          |----------+------------+------------------------------------|
          |    4     | 0          | Not used.                          |
          |----------+------------+------------------------------------|
          |    5     | » 0 1      | Tone dial enabled.                 |
          |          |            |                                    |
          |          |            | Pulse dial enabled.                |
          |----------+------------+------------------------------------|
          |    6     | 0          | Not used.                          |
          |----------+------------+------------------------------------|
          |    7     | 0 » 1      | Answer mode enabled.               |
          |          |            |                                    |
          |          |            | Originate mode enabled.            |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                  BIT-MAPPED REGISTER S21                   |
          |------------------------------------------------------------|
          | Format         | AT [cmds] S21? [cmds]                     |
          |----------------+-------------------------------------------|
          | Example:       | ATS21?<CR>                                |
          |----------------+-------------------------------------------|
          | Default:       | Read only                                 |
          |----------------+-------------------------------------------|
          | Range:         | 0 - 255                                   |
          |----------------+-------------------------------------------|
          | Unit:          | Bit-mapped                                |
          |----------------+-------------------------------------------|
          | Description:   | Displays low DTR action, DCD signal, DSR  |
          |                | signal, and the Long Space Disconnect     |
          |                | function.                                 |
          |------------------------------------------------------------|
          |   Bit    | Value |                Function                 |
          |----------+-------+-----------------------------------------|
          |  2 - 0   |  010  | Not used.                               |
          |----------+-------+-----------------------------------------|
          |   4, 3   | 00 01 | DTR signal ignored.                     |
          |          | » 10  |                                         |
          |          | 11    | Modem goes to command mode on low DTR.  |
          |          |       |                                         |
          |          |       | Modem disconnects on low DTR.           |
          |          |       | Auto-Answer is disabled.                |
          |          |       |                                         |
          |          |       | Modem is initialized on low DTR.        |
          |----------+-------+-----------------------------------------|
          |    5     | 0 » 1 | DCD forced high.                        |
          |          |       |                                         |
          |          |       | DCD normal.                             |
          |----------+-------+-----------------------------------------|
          |    6     | » 0 1 | DSR forced high.                        |
          |          |       |                                         |
          |          |       | DSR normal.                             |
          |----------+-------+-----------------------------------------|
          |    7     | » 0 1 | Long Space Disconnect function          |
          |          |       | disabled.                               |
          |          |       |                                         |
          |          |       | Long Space Disconnect function enabled. |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                  BIT-MAPPED REGISTER S22                   |
          |------------------------------------------------------------|
          | Format         | AT [cmds] S22? [cmds]                     |
          |----------------+-------------------------------------------|
          | Example:       | AT S22?<CR>                               |
          |----------------+-------------------------------------------|
          | Default:       | Read only                                 |
          |----------------+-------------------------------------------|
          | Range:         | 0 - 255                                   |
          |----------------+-------------------------------------------|
          | Unit:          | Bit-mapped.                               |
          |----------------+-------------------------------------------|
          | Description:   | Displays volume and speaker settings,     |
          |                | result codes, and make/break pulse ratio. |
          |------------------------------------------------------------|
          |    Bit    | Value |                Function                |
          |-----------+-------+----------------------------------------|
          |   1, 0    | 00 01 | Lowest volume setting.                 |
          |           | » 10  |                                        |
          |           | 11    | Low volume setting.                    |
          |           |       |                                        |
          |           |       | Medium volume setting                  |
          |           |       |                                        |
          |           |       | Highest volume setting.                |
          |-----------+-------+----------------------------------------|
          |   3, 2    | 00 »  | Speaker disabled.                      |
          |           | 01 10 |                                        |
          |           | 11    | Speaker enabled until carrier signal   |
          |           |       | detected                               |
          |           |       |                                        |
          |           |       | Speaker enabled.                       |
          |           |       |                                        |
          |           |       | Speaker enabled following dialing,     |
          |           |       | then disabled after carrier signal     |
          |           |       | detected.                              |
          |-----------+-------+----------------------------------------|
          |  6, 5 ,4  | 000   | Busy and dialtone detection disabled,  |
          |           | 100   | result codes 0-4 enabled.              |
          |           | 101   |                                        |
          |           | 110 » | Busy and dialtone detection disabled,  |
          |           | 111   | result codes 0-5, 10 enabled.          |
          |           |       |                                        |
          |           |       | Busy tone detection disabled, dialtone |
          |           |       | detection enabled, result codes 0-6,   |
          |           |       | 10 enabled.                            |
          |           |       |                                        |
          |           |       | Busy tone detection enabled, dialtone  |
          |           |       | detection disabled, result codes 0-5,  |
          |           |       | 7, 10 enabled.                         |
          |           |       |                                        |
          |           |       | Busy and dialtone detection enabled,   |
          |           |       | result codes 0-7, 10 enabled.          |
          |-----------+-------+----------------------------------------|
          |     7     | » 0 1 | 39/61ms at 10pps (North America)       |
          |           |       |                                        |
          |           |       | 33/67ms at 10pps (Europe)              |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                  BIT-MAPPED REGISTER S23                   |
          |------------------------------------------------------------|
          | Format          | AT [cmds] S23? [cmds]                    |
          |-----------------+------------------------------------------|
          | Example:        | ATS23?<CR>                               |
          |-----------------+------------------------------------------|
          | Default:        | Read only                                |
          |-----------------+------------------------------------------|
          | Range:          | 0-255                                    |
          |-----------------+------------------------------------------|
          | Unit:           | Bit-mapped                               |
          |-----------------+------------------------------------------|
          | Description:    | Displays DTE rate and parity.            |
          |------------------------------------------------------------|
          |    Bit    | Value   |               Function               |
          |-----------+---------+--------------------------------------|
          |     0     | 1       | Not used.                            |
          |-----------+---------+--------------------------------------|
          |  3, 2, 1  |   000   | Sets serial port speed to 0-300bps.  |
          |           |         |                                      |
          |           |   001   | Sets serial port speed to 600bps.    |
          |           |         |                                      |
          |           |   010   | Sets serial port speed to 1200bps.   |
          |           |         |                                      |
          |           |   011   | Sets serial port speed to 2400bps.   |
          |           |         |                                      |
          |           |   100   | Sets serial port speed to 4800bps.   |
          |           |         |                                      |
          |           |   101   | Sets serial port speed to 9600bps.   |
          |           |         |                                      |
          |           |   110   | Sets serial port speed to 19200bps.  |
          |           |         |                                      |
          |           |   111   | Sets serial port speed to 38400bps.  |
          |-----------+---------+--------------------------------------|
          |    5,4    | » 00 10 | Parity even.                         |
          |           |         |                                      |
          |           |         | Parity odd.                          |
          |-----------+---------+--------------------------------------|
          |   7, 6    | 0       | Not used.                            |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                  BIT-MAPPED REGISTER S27                   |
          |------------------------------------------------------------|
          | Format         | AT [cmds] S27? [cmds]                     |
          |----------------+-------------------------------------------|
          | Example:       | ATS27?<CR>                                |
          |----------------+-------------------------------------------|
          | Default:       | Read only                                 |
          |----------------+-------------------------------------------|
          | Range:         | 0 - 255                                   |
          |----------------+-------------------------------------------|
          | Unit:          | Bit-mapped                                |
          |----------------+-------------------------------------------|
          | Description:   | Displays protocol type.                   |
          |------------------------------------------------------------|
          |   Bit    | Value |                Function                 |
          |----------+-------+-----------------------------------------|
          |  1 - 0   | 0     | Not used.                               |
          |----------+-------+-----------------------------------------|
          |  5 - 3   | 0     | Not used.                               |
          |----------+-------+-----------------------------------------|
          |    6     | 0 » 1 | Select CCITT protocols.                 |
          |          |       |                                         |
          |          |       | Select Bell protocols.                  |
          |----------+-------+-----------------------------------------|
          |   7, 2   | 0     | Not used.                               |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                         BREAK SEND                         |
          |------------------------------------------------------------|
          | Type:        | Configuration                               |
          |--------------+---------------------------------------------|
          | Format:      | AT [cmds] \Bn [cmds]                        |
          |--------------+---------------------------------------------|
          | Example:     | AT \B3 &W<CR>                               |
          |--------------+---------------------------------------------|
          | Default:     | 3                                           |
          |--------------+---------------------------------------------|
          | Range:       | 1-9                                         |
          |--------------+---------------------------------------------|
          | Unit:        | .1 second                                   |
          |--------------+---------------------------------------------|
          | Description: | Sends break to modem.                       |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                         BREAK TYPE                         |
          |------------------------------------------------------------|
          | Type:        | Configuration                               |
          |--------------+---------------------------------------------|
          | Format:      | AT [cmds] \Kn [cmds]                        |
          |--------------+---------------------------------------------|
          | Example:     | AT \K1 <CR>                                 |
          |--------------+---------------------------------------------|
          | Description: | Configures action of break signal.          |
          |------------------------------------------------------------|
          |    Command    |  Break from  |  Break from  |    Modem     |
          |               |     DTE      | remote modem | receives \B  |
          |---------------+--------------+--------------+--------------|
          | \K0           | Enter        | Buffers      | Send break   |
          |               | command      | cleared and  | to remote    |
          |               | mode, do not | break sent   | modem        |
          |               | send break   | to DTE.      | immediately, |
          |               | to remote    |              | then enter   |
          |               | modem.       |              | command      |
          |               |              |              | mode.        |
          |---------------+--------------+--------------+--------------|
          | \K1           | Buffers      | Buffers      | Send break   |
          |               | cleared and  | cleared and  | to remote    |
          |               | break sent   | break sent   | modem        |
          |               | to remote    | to DTE.      | immediately. |
          |               | modem.       |              |              |
          |---------------+--------------+--------------+--------------|
          | \K2           | Enter        | Send break   | Send break   |
          |               | command      | to DTE       | to remote    |
          |               | mode, do not | immediately. | modem        |
          |               | send break   |              | immediately, |
          |               | to remote    |              | then enter   |
          |               | modem.       |              | command      |
          |               |              |              | mode.        |
          |---------------+--------------+--------------+--------------|
          | \K3           | Send break   | Send break   | Send break   |
          |               | to remote    | to DTE       | to remote    |
          |               | modem        | immediately. | modem        |
          |               | immediately. |              | immediately. |
          |---------------+--------------+--------------+--------------|
          | \K4           | Enter        | Break sent   | Send break   |
          |               | command      | with         | to remote    |
          |               | mode, do not | received     | modem        |
          |               | send break   | data to the  | immediately, |
          |               | to remote    | DTE.         | then enter   |
          |               | modem.       |              | command      |
          |               |              |              | mode.        |
          |---------------+--------------+--------------+--------------|
          | » \K5         | Send break   | Break sent   | Send break   |
          |               | with         | with         | to remote    |
          |               | transmitted  | received     | modem        |
          |               | data.        | data to the  | immediately. |
          |               |              | DTE.         |              |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                        COMPRESSION                         |
          |------------------------------------------------------------|
          | Type:        | Configuration                               |
          |--------------+---------------------------------------------|
          | Format:      | AT %Cn                                      |
          |--------------+---------------------------------------------|
          | Example:     | AT *EC0 %C1 *AP0<CR>                        |
          |--------------+---------------------------------------------|
          | Description: | Selects data compression.                   |
          |--------------+---------------------------------------------|
          |   Command    |                  Function                   |
          |--------------+---------------------------------------------|
          | %C0          | Data compression disabled.                  |
          |--------------+---------------------------------------------|
          | » %C1        | Data compression enabled.                   |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                        CONNECT MODE                        |
          |------------------------------------------------------------|
          | Type:        | Configuration                               |
          |--------------+---------------------------------------------|
          | Format:      | AT [cmds] \Nn [cmds]                        |
          |--------------+---------------------------------------------|
          | Example:     | AT \N1 DT555-1212<CR>                       |
          |--------------+---------------------------------------------|
          | Description: | Sets connect mode.                          |
          |--------------+---------------------------------------------|
          |   Command    |                  Function                   |
          |--------------+---------------------------------------------|
          | \N0          | Normal mode enabled.                        |
          |--------------+---------------------------------------------|
          | \N1          | Diagnostic mode, select this before         |
          |              | selecting &T commands.                      |
          |--------------+---------------------------------------------|
          | \N2          | Reliable mode enabled.                      |
          |--------------+---------------------------------------------|
          | » \N3        | Auto-reliable mode enabled.                 |
          |--------------+---------------------------------------------|
          | \N4          | LAPM mode enabled.                          |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                  CONVERT TO RELIABLE MODE                  |
          |------------------------------------------------------------|
          | Type:        | Immediate                                   |
          |--------------+---------------------------------------------|
          | Format:      | AT [cmds] \Y  [cmds]                        |
          |--------------+---------------------------------------------|
          | Example:     | AT \Y<CR>                                   |
          |--------------+---------------------------------------------|
          | Description: | Initiates reliable mode link.               |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                   EXTENDED RESULT CODES                    |
          |------------------------------------------------------------|
          | Type:        | Configuration                               |
          |--------------+---------------------------------------------|
          | Format:      | AT [cmds] \Vn [cmds]                        |
          |--------------+---------------------------------------------|
          | Example:     | AT \V1 %C1<CR>                              |
          |--------------+---------------------------------------------|
          | Description: | Selects extended result codes.              |
          |--------------+---------------------------------------------|
          | Command      |                  Function                   |
          |--------------+---------------------------------------------|
          | \V0          | Extended result codes disabled.             |
          |--------------+---------------------------------------------|
          | \V1          | Reliable result codes enabled.              |
          |--------------+---------------------------------------------|
          | » \V2        | Error correction and compression result     |
          |              | codes enabled.                              |
          |--------------+---------------------------------------------|
          | \V3          | DTE speed result codes enabled.             |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                     FLOW CONTROL TYPE                      |
          |------------------------------------------------------------|
          | Type:        | Configuration                               |
          |--------------+---------------------------------------------|
          | Format:      | AT [cmds] \Qn [cmds]                        |
          |--------------+---------------------------------------------|
          | Example:     | AT \Q3 A <CR>                               |
          |--------------+---------------------------------------------|
          | Description: | Sets type of flow control used by modem.    |
          |--------------+---------------------------------------------|
          | Command      |                  Function                   |
          |--------------+---------------------------------------------|
          | \Q0          | Flow control disabled.                      |
          |--------------+---------------------------------------------|
          | \Q1          | XON/XOFF flow control enabled.              |
          |--------------+---------------------------------------------|
          | » \Q3        | RTS/CTS flow control enabled.               |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                      INACTIVITY TIMER                      |
          |------------------------------------------------------------|
          | Type:        | Configuration                               |
          |--------------+---------------------------------------------|
          | Format:      | AT [cmds] \Tn [cmds]                        |
          |--------------+---------------------------------------------|
          | Example:     | AT\T5<CR>                                   |
          |--------------+---------------------------------------------|
          | Default:     | 0                                           |
          |--------------+---------------------------------------------|
          | Range:       | 0-42                                        |
          |--------------+---------------------------------------------|
          | Unit:        | 1 minute                                    |
          |--------------+---------------------------------------------|
          | Description: | Sets the length of time that the modem does |
          |              | not receive information before it           |
          |              | disconnects.                                |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |            MAXIMUM BLOCK SIZE FOR TRANSMISSION             |
          |------------------------------------------------------------|
          | Type:        | Configuration                               |
          |--------------+---------------------------------------------|
          | Format:      | AT [cmds] \An [cmds]                        |
          |--------------+---------------------------------------------|
          | Example:     | AT \A3 &MB28800<CR>                         |
          |--------------+---------------------------------------------|
          | Description: | Sets the maximum transmittable block size.  |
          |--------------+---------------------------------------------|
          |   Command    |                  Function                   |
          |--------------+---------------------------------------------|
          | \A0          | Maximum MNP block size is 64 characters.    |
          |--------------+---------------------------------------------|
          | \A1          | Maximum MNP block size is 128 characters.   |
          |--------------+---------------------------------------------|
          | » \A2        | Maximum MNP block size is 192 characters.   |
          |--------------+---------------------------------------------|
          | \A3          | Maximum MNP block size is 256 characters.   |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                  ON-LINE IN RELIABLE MODE                  |
          |------------------------------------------------------------|
          | Type:        | Immediate                                   |
          |--------------+---------------------------------------------|
          | Format:      | AT [cmds] \O                                |
          |--------------+---------------------------------------------|
          | Example:     | AT \O <CR>                                  |
          |--------------+---------------------------------------------|
          | Description: | Returns to on-line and requests reliable    |
          |              | mode connection.                            |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                       PROTOCOL/SPEED                       |
          |------------------------------------------------------------|
          | Type:        | Register                                    |
          |--------------+---------------------------------------------|
          | Format:      | AT [cmds] S31=n [cmds]                      |
          |--------------+---------------------------------------------|
          | Example:     | AT S31=0 <CR>                               |
          |--------------+---------------------------------------------|
          | Description: | Selects the maximum DCE speed.              |
          |--------------+---------------------------------------------|
          |   Command    |                  Function                   |
          |--------------+---------------------------------------------|
          | » S31=0      | Select last speed at AT command.            |
          |--------------+---------------------------------------------|
          | S31=3        | Select 300bps speed.                        |
          |--------------+---------------------------------------------|
          | S31=5        | Select 1200bps speed.                       |
          |--------------+---------------------------------------------|
          | S31=6        | Select 2400bps speed.                       |
          |--------------+---------------------------------------------|
          | S31=7        | Select 4800bps speed.                       |
          |--------------+---------------------------------------------|
          | S31=8        | Select 7200bps speed.                       |
          |--------------+---------------------------------------------|
          | S31=9        | Select 9600bps speed.                       |
          |--------------+---------------------------------------------|
          | S31=10       | Select 12Kbps speed.                        |
          |--------------+---------------------------------------------|
          | S31=11       | Select 14.4Kbps speed.                      |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                  RETURN TO RELIABLE MODE                   |
          |------------------------------------------------------------|
          | Type:        | Immediate                                   |
          |--------------+---------------------------------------------|
          | Format:      | AT [cmds] \Z  [cmds]                        |
          |--------------+---------------------------------------------|
          | Example:     | AT \Z <CR>                                  |
          |--------------+---------------------------------------------|
          | Description: | Ends reliable mode link, initiate return to |
          |              | normal mode.                                |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                         TEST MODES                         |
          |------------------------------------------------------------|
          | Format         | AT [cmds] S16=n [cmds]                    |
          |----------------+-------------------------------------------|
          | Example:       | ATS16=40<CR>                              |
          |----------------+-------------------------------------------|
          | Default:       | 0                                         |
          |----------------+-------------------------------------------|
          | Range:         | 0-125                                     |
          |----------------+-------------------------------------------|
          | Unit:          | Bit-mapped                                |
          |----------------+-------------------------------------------|
          | Description:   | Controls loopback tests, analog, digital, |
          |                | remote digital, and self tests.           |
          |------------------------------------------------------------|
          |   Bit    | Value  |                Function                |
          |----------+--------+----------------------------------------|
          |    0     | » 0 1  | Local analog loopback not in progress. |
          |          |        |                                        |
          |          |        | Local analog loopback in progress.     |
          |----------+--------+----------------------------------------|
          |    1     | » 0    | Not used.                              |
          |----------+--------+----------------------------------------|
          |  5 - 1   | 0      | Not used.                              |
          |----------+--------+----------------------------------------|
          |    6     | » 0 1  | Local analog loopback w/ self-test not |
          |          |        | in progress.                           |
          |          |        |                                        |
          |          |        | Local analog loopback w/ self-test in  |
          |          |        | progress.                              |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                V.42bis COMPRESSION CONTROL                 |
          |------------------------------------------------------------|
          | Type:        | Configuration                               |
          |--------------+---------------------------------------------|
          | Format:      | AT [cmds] "Hn [cmds]                        |
          |--------------+---------------------------------------------|
          | Example:     | AT "H3 &W<CR>                               |
          |--------------+---------------------------------------------|
          | Description: | Controls V.42bis data compression           |
          |--------------+---------------------------------------------|
          | Command      |                  Function                   |
          |--------------+---------------------------------------------|
          | "H0          | V.42bis disabled.                           |
          |--------------+---------------------------------------------|
          | "H1          | V.42bis when transmitting enabled.          |
          |--------------+---------------------------------------------|
          | "H2          | V.42bis when receiving enabled.             |
          |--------------+---------------------------------------------|
          | » "H3        | V.42bis when transmitting/receiving         |
          |              | enabled.                                    |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                   XON/XOFF PASS-THROUGH                    |
          |------------------------------------------------------------|
          | Type:        | Configuration                               |
          |--------------+---------------------------------------------|
          | Format:      | AT [cmds] \Xn [cmds]                        |
          |--------------+---------------------------------------------|
          | Example:     | AT \X1 O<CR>                                |
          |--------------+---------------------------------------------|
          | Description: | Selects whether XON/XOFF signals are sent   |
          |              | to remote modem.                            |
          |--------------+---------------------------------------------|
          | Command      |                  Function                   |
          |--------------+---------------------------------------------|
          | » \X0        | XON/XOFF signals trapped by local modem.    |
          |--------------+---------------------------------------------|
          | \X1          | XON/XOFF passed through local modem.        |
          +------------------------------------------------------------+