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# MULTI-TECH SYSTEMS, INC.
MT5600DSVD
Card Type Modem
Chip Set Unidentified
I/O Options 25-pin serial port, power, line in,
line out, microphone in, speaker jack
Maximum Modem Rate 56Kbps
Maximum Fax Rate 14.4Kbps
Data Modulation Bell 103/212A
Protocol
ITU-T V.22, V.22bis, V.32ter, V.32bis,
V.34, K56flex
Fax Modulation ITU-T V.17, V.27ter, V.29
Protocol
Error MNP5, V.42, V.42bis
Correction/Compression
Fax Class Unidentified
Data Bus External
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Function | Label | Function | Label |
|------------------------------------------------------------|
| Line in (RJ-11) | CN1 | Microphone in | CN5 |
|---------------------------+---------+---------------+------|
| Line out (RJ-11) | CN2 | Speaker jack | CN6 |
|---------------------------+---------+---------------+------|
| 25-pin serial port | CN3 | Power switch | SW1 |
|---------------------------+---------+---------------+------|
| Power jack | CN4 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Label | Position |
|----------------------------------------+-------+-----------|
| í Stereo speaker mode enabled | J10 | Closed |
|----------------------------------------+-------+-----------|
| Mono speaker mode enabled | J10 | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DIAGNOSTIC LED(S) |
|------------------------------------------------------------|
| LED | Color | Status | Condition |
|-----+----------------+----------+--------------------------|
| TD | Unidentified | Blinking | Modem transmitting data |
|-----+----------------+----------+--------------------------|
| TD | Unidentified | Off | Modem not transmitting |
| | | | data |
|-----+----------------+----------+--------------------------|
| RD | Unidentified | Blinking | Modem is receiving data |
|-----+----------------+----------+--------------------------|
| RD | Unidentified | Off | Modem is not receiving |
| | | | data |
|-----+----------------+----------+--------------------------|
| CD | Unidentified | On | Carrier signal detected |
|-----+----------------+----------+--------------------------|
| CD | Unidentified | Off | Carrier signal not |
| | | | detected |
|-----+----------------+----------+--------------------------|
| 56 | Unidentified | On | Modem connected in |
| | | | K56flex or V.PCM mode |
|-----+----------------+----------+--------------------------|
| 56 | Unidentified | Off | Modem is not connected |
| | | | in K56flex or V.PCM mode |
|-----+----------------+----------+--------------------------|
| 33 | Unidentified | On | Modem connected in V.34 |
| | | | mode at speeds up to |
| | | | 33.6Kbps |
|-----+----------------+----------+--------------------------|
| 33 | Unidentified | Off | Modem is not connected |
| | | | in V.34 mode at speeds |
| | | | up to 33.6Kbps |
|-----+----------------+----------+--------------------------|
| 14 | Unidentified | On | Modem connected in |
| | | | V.32bis mode at 14.4Kbps |
|-----+----------------+----------+--------------------------|
| 14 | Unidentified | Off | Modem is not connected |
| | | | in V.32bis mode at |
| | | | 14.4Kbps |
|-----+----------------+----------+--------------------------|
| OH | Unidentified | On | Modem is on-hook |
|-----+----------------+----------+--------------------------|
| OH | Unidentified | Off | Modem is off-hook |
|-----+----------------+----------+--------------------------|
| TR | Unidentified | On | DTR signal is high |
|-----+----------------+----------+--------------------------|
| TR | Unidentified | Off | DTR signal is low |
|-----+----------------+----------+--------------------------|
| EC | Unidentified | On | Modem is set for V.42 |
| | | | error compression |
|-----+----------------+----------+--------------------------|
| EC | Unidentified | Off | Modem is not set for |
| | | | V.42 error compression |
|-----+----------------+----------+--------------------------|
| EC | Unidentified | Blinking | Data compression enabled |
|-----+----------------+----------+--------------------------|
| FX | Unidentified | On | Modem is in Fax mode |
|-----+----------------+----------+--------------------------|
| FX | Unidentified | Off | Modem is not in Fax mode |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SUPPORTED COMMAND SET |
|------------------------------------------------------------|
| Basic AT Commands |
|------------------------------------------------------------|
| AT, ‘+++’, A/ |
|------------------------------------------------------------|
| A, B, E, H, M, O, P, Q, T, V, W, X, Y, Z |
|------------------------------------------------------------|
| &C, &F, &G, &T, &W, &Y, &Z |
|------------------------------------------------------------|
| Extended AT Commands |
|------------------------------------------------------------|
| \A, \B, \J, \K, \N, \V |
|------------------------------------------------------------|
| %C, %E, %L, %Q |
|------------------------------------------------------------|
| Special Commands |
|------------------------------------------------------------|
| -K, #CID |
|------------------------------------------------------------|
| S Registers |
|------------------------------------------------------------|
| S0, S1, S2, S3, S4, S5, S6 S7, S8, S9, S10, S11, S12, S18, |
| S24, S25, S29, S32, S33, S38 |
|------------------------------------------------------------|
| Voice Commands |
|------------------------------------------------------------|
| #CLS, #MDL?, #MFR?, #REV? |
|------------------------------------------------------------|
| Note: See MHI Help File for full command documentation. |
+------------------------------------------------------------+
Proprietary AT Command Set
+------------------------------------------------------------+
| AUTO-MODE DETECTION |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] Nn [cmds] |
|--------------+---------------------------------------------|
| Description: | Selects various options for the automatic |
| | detection and negotiation of protocols |
| | during the handshake process if the modem |
| | is communicating with a remote modem of |
| | dissimilar speed. |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| N0 | Auto-mode detection disabled. Handshake |
| | begins at line speed designated by the S37 |
| | register. If S37=0 handshake follows |
| | interface speed |
|--------------+---------------------------------------------|
| í N1 | Auto-mode detection enabled. Handshake |
| | begins at line speed designated by the S37 |
| | register. If S37=0 handshake at highest |
| | possible speed with fallback to lower speed |
| | if necessary |
+------------------------------------------------------------+
+------------------------------------------------------------+
| COMMUNICATIONS MODE |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] &Mn [cmds] |
|--------------+---------------------------------------------|
| Description: | Selects communications mode |
|--------------+---------------------------------------------|
| Command | Mode |
|--------------+---------------------------------------------|
| &M0 | Asynchronous mode |
+------------------------------------------------------------+
+------------------------------------------------------------+
| COMMUNICATIONS MODE |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] &Qn [cmds] |
|--------------+---------------------------------------------|
| Description: | Selects communications mode options |
|--------------+---------------------------------------------|
| Command | Mode |
|--------------+---------------------------------------------|
| &Q0 | Asynchronous mode, serial port speed |
| | follows connect speed. |
|--------------+---------------------------------------------|
| í &Q5 | Error correction mode |
|--------------+---------------------------------------------|
| &Q6 | Buffered asynchronous mode |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CONFIGURATION PROFILES & CALL STATISTICS |
|------------------------------------------------------------|
| Type: | Immediate |
|--------------+---------------------------------------------|
| Format: | AT [cmds] &V [cmds] |
|--------------+---------------------------------------------|
| Description: | Displays active and stored configuration |
| | profiles & statistics for last connection |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| &V0 | Displays the active configuration, the two |
| | stored user profiles, and the first four |
| | phone numbers |
|--------------+---------------------------------------------|
| &V1 | Displays statistics for last connection |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DATA SET READY (DSR) |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] &Sn [cmds] |
|--------------+---------------------------------------------|
| Description: | Selects DSR options |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| &S0 | DSR forced high |
|--------------+---------------------------------------------|
| &S1 | DSR high only while modem is connected |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DATA TERMINAL READY (DTR) |
|------------------------------------------------------------|
| Type: | Configuration |
|---------------+--------------------------------------------|
| Format: | AT [cmds] &Dn [cmds] |
|---------------+--------------------------------------------|
| Description: | Selects modem response to DTR |
|------------------------------------------------------------|
| Note: The action each variant of &D causes depends |
| on the setting of &Q |
|------------------------------------------------------------|
| &Q Setting | &D0 | &D1 | &D2 | &D3 |
|------------------+----------+----------+---------+---------|
| &Q0, &Q5, &Q6 | Command | Command | Command | Command |
| | 0 | 1 | 2 | 4 |
|------------------+----------+----------+---------+---------|
| &Q1, &Q4 | Command | Command | Command | Command |
| | 3 | 1 | 2 | 2 |
|------------------+----------+----------+---------+---------|
| &Q2, &Q3 | Command | Command | Command | Command |
| | 2 | 2 | 2 | 2 |
|------------------------------------------------------------|
| Command | Function |
|---------------+--------------------------------------------|
| Command 0 | Modem does not respond to DTR |
|---------------+--------------------------------------------|
| Command 1 | Modem goes to command mode after DTR goes |
| | is off |
|---------------+--------------------------------------------|
| Command 2 | Modem goes to command mode and disconnects |
| | (hangs up) after DTR goes off; Auto-Answer |
| | is disabled. |
|---------------+--------------------------------------------|
| Command 3 | Modem goes to command mode and disconnects |
| | (hangs up) after DTR goes off; Auto-Answer |
| | is not disabled |
|---------------+--------------------------------------------|
| Command 4 | Modem is initialized after DTR goes off |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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 |
|--------------+---------------------------------------------|
| DP | Pulse dialing enabled |
|--------------+---------------------------------------------|
| DS=n | Dial stored telephone number n |
|--------------+---------------------------------------------|
| DT | Tone dialing enabled/Pulse dialing disabled |
|--------------+---------------------------------------------|
| DW | Dialing resumed following dial tone |
| | detection |
|--------------+---------------------------------------------|
| D, | Dialing paused for amount of time specified |
| | in S8 register |
|--------------+---------------------------------------------|
| D! | Flash function initiated. Modem commanded |
| | to go off-hook for specified time before |
| | returning on-hook. |
|--------------+---------------------------------------------|
| D@ | Wait for quiet Answer function enabled. |
| | Modem waits until a "quiet answer," a |
| | ring-back signal followed by silence up to |
| | the time specified in S7, is received prior |
| | to executing the rest of the dial string. |
|--------------+---------------------------------------------|
| D; | Modem returned to idle state after dialing. |
| | The semicolon can only be placed at the end |
| | of the dial command. |
|--------------+---------------------------------------------|
| D$ | Calling card "Bong" detection enabled |
|--------------+---------------------------------------------|
| D^ | Data calling tone transmission disabled |
+------------------------------------------------------------+
+------------------------------------------------------------+
| FACTORY DEFAULT PROFILE |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] &F [cmds] |
|--------------+---------------------------------------------|
| Description: | Sets values in active profile to values |
| | found in the default profile |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| &F0 | Load factory configuration 0 |
|--------------+---------------------------------------------|
| &F1 | Load factory configuration 1 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| FLOW CONTROL |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] &Kn [cmds] |
|--------------+---------------------------------------------|
| Description: | Enables flow control options |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| &K0 | Flow control disabled |
|--------------+---------------------------------------------|
| &K3 | RTS/CTS flow control enabled |
|--------------+---------------------------------------------|
| &K4 | XON/XOFF flow control enabled |
|--------------+---------------------------------------------|
| &K5 | Transparent XON/XOFF flow control enabled |
|--------------+---------------------------------------------|
| &K6 | Both RTS/CTS & XON/XOFF flow control |
| | enabled |
+------------------------------------------------------------+
+------------------------------------------------------------+
| PULSE DIALING RATIO |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] &Pn [cmds] |
|--------------+---------------------------------------------|
| Description: | Selects pulse dial make/break ratio |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| &P0 | 39/61ms at 10pps (North America) |
+------------------------------------------------------------+
+------------------------------------------------------------+
| REPORT INFORMATION |
|------------------------------------------------------------|
| Type: | Immediate |
|--------------+---------------------------------------------|
| Format: | AT [cmds] In [cmds] |
|--------------+---------------------------------------------|
| Description: | Displays information requested |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| I0 | Reports default speed and controller |
| | firmware code |
|--------------+---------------------------------------------|
| I1 | Reports ROM checksum |
|--------------+---------------------------------------------|
| I2 | Tests and reports ROM checksum |
|--------------+---------------------------------------------|
| I3 | Reports default speed and controller |
| | firmware code |
|--------------+---------------------------------------------|
| I4 | Reports OEM identifier string in either |
| | binary or ASCII format |
|--------------+---------------------------------------------|
| I5 | Reports country code |
|--------------+---------------------------------------------|
| I6 | Reports data pump model and internal code |
|--------------+---------------------------------------------|
| I7 | Reports country code |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SPEAKER VOLUME |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] Ln [cmds] |
|--------------+---------------------------------------------|
| Description: | Controls speaker volume |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| L0 | Low volume setting |
|--------------+---------------------------------------------|
| L1 | Low volume setting |
|--------------+---------------------------------------------|
| L2 | Medium volume setting |
|--------------+---------------------------------------------|
| L3 | Highest volume setting |
+------------------------------------------------------------+
+------------------------------------------------------------+
| TRANSMIT CARRIER |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] Cn [cmds] |
|--------------+---------------------------------------------|
| Description: | Controls the transmit carrier switching |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| C1 | Transmit carrier enabled |
+------------------------------------------------------------+
Extended AT Commands
+------------------------------------------------------------+
| FLOW CONTROL |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] \Gn [cmds] |
|--------------+---------------------------------------------|
| Description: | Command nonfunctional; for compatibility |
| | purposes only |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| \G0 | Returns OK for backward compatibility |
+------------------------------------------------------------+
+------------------------------------------------------------+
| PCM CODE SELECTION |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] %Un [cmds] |
|--------------+---------------------------------------------|
| Description: | Determines the PCM code type for 56K |
| | modulation |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| í %U0 | m -law encoding enabled (North America & |
| | Japan) |
|--------------+---------------------------------------------|
| %U1 | A -law encoding enabled (Europe) |
+------------------------------------------------------------+
SPECIAL COMMANDS
+------------------------------------------------------------+
| DISTINCTIVE RING |
|------------------------------------------------------------|
| Type: | Immediate |
|--------------+---------------------------------------------|
| Format: | AT [cmds] -SDR=n [cmds] |
|--------------+---------------------------------------------|
| Description: | Selects the distinctive ring settings |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| -SDR=0 | Distinctive ring disabled |
|--------------+---------------------------------------------|
| -SDR=1 | Type 1 enabled |
|--------------+---------------------------------------------|
| -SDR=2 | Type 2 enabled |
|--------------+---------------------------------------------|
| -SDR=3 | Type 1 and 2 enabled |
|--------------+---------------------------------------------|
| -SDR=4 | Type 3 enabled |
|--------------+---------------------------------------------|
| -SDR=5 | Type 1 and 3 enabled |
|--------------+---------------------------------------------|
| -SDR=6 | Type 2 and 3 enabled |
|--------------+---------------------------------------------|
| -SDR=7 | Type 1, 2, and 3 enabled |
+------------------------------------------------------------+
+------------------------------------------------------------+
| MODULATION SELECTION |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] +MS=x,y,z,a [cmds] |
|--------------+---------------------------------------------|
| Description: | Sets options for active protocol; the |
| | transfer rates specified by z and a must be |
| | valid for the protocol selected. +MS? |
| | queries setting |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| x=0 | V.21 |
|--------------+---------------------------------------------|
| x=1 | V.22 |
|--------------+---------------------------------------------|
| x=2 | V.22bis |
|--------------+---------------------------------------------|
| x=3 | V.23 |
|--------------+---------------------------------------------|
| x=9 | V.32 |
|--------------+---------------------------------------------|
| x=10 | V.32bis |
|--------------+---------------------------------------------|
| x=11 | V.34 |
|--------------+---------------------------------------------|
| í x=12 | V.90, fallback to K56flex. .V.34 . |
| | .V.32bis, etc.. |
|--------------+---------------------------------------------|
| x=13 | K56flex, fallback to V.90. .V.34. .V.32bis, |
| | etc.. |
|--------------+---------------------------------------------|
| x=64 | Bell 103 |
|--------------+---------------------------------------------|
| x=69 | Bell 212A |
+------------------------------------------------------------+
VOICE COMMANDS
+------------------------------------------------------------+
| DATA/DSVD MODE |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] -SMS=n [cmds] |
|--------------+---------------------------------------------|
| Description: | Selects data or DSVD mode |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| í -SMS=0 | Data mode |
|--------------+---------------------------------------------|
| -SMS=1 | DSVD mode |
|--------------+---------------------------------------------|
| -SMS=3 | Automatic mode selection |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DSVD MODE |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] -SSE=n [cmds] |
|--------------+---------------------------------------------|
| Description: | Select whether the modem will use DSVD |
| | mode. |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| í -SSE=0 | DSVD mode disabled. |
|--------------+---------------------------------------------|
| -SSE=1 | DSVD mode enabled. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| VOICE DEVICE |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] #VLS=n [cmds] |
|--------------+---------------------------------------------|
| Description: | Selects the I/O device for the DSP chip. |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| í #VLS=5 | Headset used for voice I/O. |
|--------------+---------------------------------------------|
| #VLS=6 | Speakerphone used for voice I/O. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| VOICE - LOCAL SERIAL PORT SPEED |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] #BDR=n [cmds] |
|--------------+---------------------------------------------|
| Range: | 0-48 |
|--------------+---------------------------------------------|
| Unit: | 2400bps |
|--------------+---------------------------------------------|
| Description: | Sets the speed of the local serial port |
| | when in voice mode. |
+------------------------------------------------------------+
S(STATUS) -REGISTERS
+------------------------------------------------------------+
| CONNECTION FAILURE CODES |
|------------------------------------------------------------|
| Type: | Register |
|--------------+---------------------------------------------|
| Format | AT [cmds] S86? [cmds] |
|--------------+---------------------------------------------|
| Description: | Reports codes which correspond to the |
| | possible causes of a connection failure |
|--------------+---------------------------------------------|
| Value | Meaning |
|--------------+---------------------------------------------|
| 0 | Normal hang up |
|--------------+---------------------------------------------|
| 4 | Carrier signal lost |
|--------------+---------------------------------------------|
| 5 | No error-control detected for remote modem |
| | during feature negotiation |
|--------------+---------------------------------------------|
| 9 | No common protocol found |
|--------------+---------------------------------------------|
| 12 | No failure - remote modem disconnected |
| | normally |
|--------------+---------------------------------------------|
| 13 | Remote modem failed to respond after 10 |
| | re-transmissions same message |
|--------------+---------------------------------------------|
| 14 | Violation of negotiated protocol caused |
| | failure |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DCE LINE SPEED |
|------------------------------------------------------------|
| Type: | Register |
|--------------+---------------------------------------------|
| Format | AT [cmds] S37=n [cmds] |
|--------------+---------------------------------------------|
| Description: | Sets the maximum allowable data exchange |
| | rate attempted during handshake process. |
| | For compatibility only, use +MS to set line |
| | speed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| ERROR CORRECTION NEGOTIATION |
|------------------------------------------------------------|
| Type: | Register |
|------------------------+-----------------------------------|
| Format | AT [cmds] S36=n [cmds] |
|------------------------+-----------------------------------|
| Description: | Selects the action of the modem |
| | if it fails to connect when error |
| | control is selected. |
|------------------------------------------------------------|
| Command | S48=7 | S48=128 |
|-----------+-----------------------+------------------------|
| S36=0 | LAPM or hang-up | Not used |
|-----------+-----------------------+------------------------|
| S36=1 | LAPM or Asynchronous | Asynchronous |
|-----------+-----------------------+------------------------|
| S36=2 | LAPM or hang-up | Not used |
|-----------+-----------------------+------------------------|
| S36=3 | LAPM or Asynchronous | Asynchronous |
|-----------+-----------------------+------------------------|
| S36=4 | LAPM, MNP, or hang-up | MNP or hang-up |
|-----------+-----------------------+------------------------|
| S36=5 | LAPM, MNP, or | MNP or Asynchronous |
| | Asynchronous | |
|-----------+-----------------------+------------------------|
| S36=6 | LAPM, MNP, or hang-up | MNP or hang-up |
|-----------+-----------------------+------------------------|
| S36=7 | LAPM, MNP, or | MNP or Asynchronous |
| | Asynchronous | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| ERROR CORRECTION/COMPRESSION |
|------------------------------------------------------------|
| Type: | Register |
|------------------------------------------------------------|
| Format: | AT [cmds] S46=n [cmds] |
|--------------+---------------------------------------------|
| Description: | Selects active error correction and |
| | compression protocols |
|------------------------------------------------------------|
| Command | Function |
|---------------+--------------------------------------------|
| S46=136 | Error correction only, no compression |
|---------------+--------------------------------------------|
| S46=138 | Error correction with V.42bis data |
| | compression |
+------------------------------------------------------------+
+------------------------------------------------------------+
| FEATURE NEGOTIATION |
|------------------------------------------------------------|
| Type: | Register |
|------------------------------------------------------------|
| Format: | AT [cmds] S48=n [cmds] |
|--------------+---------------------------------------------|
| Description: | Selects active error correction and |
| | compression protocols. See S36, error |
| | correction negotiation table |
|------------------------------------------------------------|
| Command | Function |
|-----------------+------------------------------------------|
| S48=0 | Detection negotiation disabled |
|-----------------+------------------------------------------|
| S48=7 | Detection negotiation enabled |
|-----------------+------------------------------------------|
| S48=128 | Fall-back to options set in S36 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| INACTIVITY TIMER |
|------------------------------------------------------------|
| Type: | Register |
|--------------+---------------------------------------------|
| Format | AT [cmds] S30=n [cmds] |
|--------------+---------------------------------------------|
| Range: | 0-255 |
|--------------+---------------------------------------------|
| Unit: | 10 ms |
|--------------+---------------------------------------------|
| Description: | Maximum duration of DTE and DCE inactivity |
| | allowed prior to initiating hang-up |
| | process. |
|------------------------------------------------------------|
| Note: S30=0 disables the timer and allows indefinite |
| inactivity. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| V.25 CALLING TONE |
|------------------------------------------------------------|
| Type: | Register |
|--------------+---------------------------------------------|
| Format | AT [cmds] S35=n [cmds] |
|--------------+---------------------------------------------|
| Range: | 0-1 |
|--------------+---------------------------------------------|
| Unit: | Decimal |
|--------------+---------------------------------------------|
| Description: | Enables V.25 data calling tone, which |
| | allows remote data/fax/voice discrimination |
|------------------------------------------------------------|
| Note: S35=0 disables V.25 data calling tone. |
+------------------------------------------------------------+