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# DIAMOND MULTIMEDIA SYSTEMS, INC.
SUPRAEXPRESS 336SP (EXTERNAL)
Card Type Modem, Fax
Chip Set Unidentified
Maximum Modem Rate 33.6Kbps
Maximum Fax Rate 14.4Kbps
Data Modulation Bell 103A/212A
Protocol
ITU-T V.21, V.22, V.22bis, V.32,
V.32bis, V.34, V.FC
Fax Modulation ITU-T V.17, V.27ter, V.29
Protocol
Error MNP5, V.42, V.42bis
Correction/Compression
Fax Class Class I
Data Bus External
54929
+------------------------------------------------------------+
| SUPPORTED COMMAND SET |
|------------------------------------------------------------|
| Basic AT Commands |
|------------------------------------------------------------|
| AT, ‘+++’, A/ |
|------------------------------------------------------------|
| A, B, D, E, H, M, O, Q, S, V, W, X |
|------------------------------------------------------------|
| &C, &V |
|------------------------------------------------------------|
| Extended AT Commands |
|------------------------------------------------------------|
| \N |
|------------------------------------------------------------|
| %C |
|------------------------------------------------------------|
| S Registers |
|------------------------------------------------------------|
| S0, S1, S2, S3, S4, S5, S6, S7, S8, S9, S10, S11, S12, |
| S25, S38, S46 |
|------------------------------------------------------------|
| Voice Commands |
|------------------------------------------------------------|
| #VLS |
|------------------------------------------------------------|
| Special Commands |
|------------------------------------------------------------|
| +MS |
|------------------------------------------------------------|
| 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 |
|--------------+---------------------------------------------|
| í N1 | In originate mode, handshake begins at line |
| | speed designated by the S37 register. Modem |
| | can shift to a slower speed if necessary. |
| | |
| | In answer mode, handshake attempted with |
| | the following protocols in order - V.FC, |
| | V.32bis, V.32, V.22bis, V.22 or Bell 212, |
| | V.21, and Bell 103 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| COMMUNICATIONS MODE |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] &Qn [cmds] |
|--------------+---------------------------------------------|
| Description: | Selects communications mode options |
|--------------+---------------------------------------------|
| Command | Mode |
|--------------+---------------------------------------------|
| í &Q0 | Asynchronous mode, serial port speed |
| | follows connect speed. |
|--------------+---------------------------------------------|
| &Q5 | Error correction mode |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DATA TERMINAL READY (DTR) |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] &Dn [cmds] |
|--------------+---------------------------------------------|
| Description: | Selects modem response to DTR |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| í &D0 | Modem does not respond to DTR |
|--------------+---------------------------------------------|
| &D1 | Modem goes to command mode after DTR goes |
| | is off |
|--------------+---------------------------------------------|
| &D2 | Modem goes to command mode and disconnects |
| | (hangs up) after DTR goes off; Auto-Answer |
| | is disabled. |
|--------------+---------------------------------------------|
| &D3 | Modem is initialized after DTR goes off |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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 | Direct mode without flow control |
|--------------+---------------------------------------------|
| &F2 | Reliable mode |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| REPORT INFORMATION |
|------------------------------------------------------------|
| Type: | Immediate |
|--------------+---------------------------------------------|
| Format: | AT [cmds] In [cmds] |
|--------------+---------------------------------------------|
| Description: | Displays information requested |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| I0 | Reports maximum data carrier rate |
|--------------+---------------------------------------------|
| I1 | Reports ROM checksum |
|--------------+---------------------------------------------|
| I2 | Tests and reports ROM checksum |
|--------------+---------------------------------------------|
| I3 | Reports ROM code revision number |
|--------------+---------------------------------------------|
| I4 | Report supported protocols in encrypted |
| | format |
|--------------+---------------------------------------------|
| I5 | Reports firmware copyright information |
|--------------+---------------------------------------------|
| I7 | Reports data pump model |
|--------------+---------------------------------------------|
| I10 | Reports optional features |
|--------------+---------------------------------------------|
| I92 | Reports product ID code |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SPEAKER VOLUME |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] Ln [cmds] |
|--------------+---------------------------------------------|
| Description: | Controls speaker volume |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| L0 | Low volume setting |
|--------------+---------------------------------------------|
| í L2 | Medium volume setting |
|--------------+---------------------------------------------|
| L3 | Highest volume setting |
+------------------------------------------------------------+
Extended AT Commands
+------------------------------------------------------------+
| AUTO-RETRAIN - AUTO-FALLBACK/FALL-FORWARD |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] %En [cmds] |
|--------------+---------------------------------------------|
| Description: | Controls auto-retrain mode and |
| | fallback/fall-forward |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| %E0 | Auto-retrain disabled |
|--------------+---------------------------------------------|
| %E1 | Auto-retrain enabled |
+------------------------------------------------------------+
+------------------------------------------------------------+
| RATE NEGOTIATION |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] %Gn [cmds] |
|--------------+---------------------------------------------|
| Description: | Controls rate negotiation |
|------------------------------------------------------------|
| Command | Function |
|----------------+-------------------------------------------|
| %G0 | Rate negotiation disabled |
|----------------+-------------------------------------------|
| %G1 | Rate negotiation enabled |
+------------------------------------------------------------+
Audiospan Command Set
+------------------------------------------------------------+
| AUDIOSPAN MODE SELECTION |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] -SMS=x,y,z,t [cmds] |
|--------------+---------------------------------------------|
| Description: | Sets the various options for Audiospan |
|------------------------------------------------------------|
| Command | Function |
|---------------------+--------------------------------------|
| x=0 | Data mode |
|---------------------+--------------------------------------|
| x=1 | DSVD mode |
|---------------------+--------------------------------------|
| x=2 | Audiospan mode |
|---------------------+--------------------------------------|
| x=3 | Automatic mode select |
|------------------------------------------------------------|
| y=4800 | Minimum data speed 4800bps |
|--------------+---------------------------------------------|
| y=7200 | Minimum data speed 7200bps |
|--------------+---------------------------------------------|
| y=9600 | Minimum data speed 9600bps |
|--------------+---------------------------------------------|
| y=12000 | Minimum data speed 12000bps |
|--------------+---------------------------------------------|
| y=14400 | Minimum data speed 14400bps |
|--------------+---------------------------------------------|
| y=16800 | Minimum data speed 16800bps |
|--------------+---------------------------------------------|
| y=21600 | Minimum data speed 21600bps |
|--------------+---------------------------------------------|
| y=24000 | Minimum data speed 24000bps |
|--------------+---------------------------------------------|
| y=26400 | Minimum data speed 26400bps |
|--------------+---------------------------------------------|
| y=28800 | Minimum data speed 28800bps |
|------------------------------------------------------------|
| z=4800 | Maximum data speed 4800bps |
|---------------------+--------------------------------------|
| z=7200 | Maximum data speed 7200bps |
|---------------------+--------------------------------------|
| z=9600 | Maximum data speed 9600bps |
|---------------------+--------------------------------------|
| z=12000 | Maximum data speed 12000bps |
|---------------------+--------------------------------------|
| z=14400 | Maximum data speed 14400bps |
|---------------------+--------------------------------------|
| z=16800 | Maximum data speed 16800bps |
|---------------------+--------------------------------------|
| z=21600 | Maximum data speed 21600bps |
|---------------------+--------------------------------------|
| z=24000 | Maximum data speed 24000bps |
|---------------------+--------------------------------------|
| z=26400 | Maximum data speed 26400bps |
|---------------------+--------------------------------------|
| z=28800 | Maximum data speed 28800bps |
+------------------------------------------------------------+
+------------------------------------------------------------+
| AUDIOSPAN MODULATION |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] -SQS=x,y [cmds] |
|--------------+---------------------------------------------|
| Description: | Selects Audiospan modulation |
|------------------------------------------------------------|
| Command | Function |
|---------------+--------------------------------------------|
| x=0 | V.61 |
|---------------+--------------------------------------------|
| x=1 | ML144 |
|---------------+--------------------------------------------|
| x=2 | ML288 |
|---------------+--------------------------------------------|
| y=0 | Disable Audiospan automodulation |
|---------------+--------------------------------------------|
| y=1 | Enable Audiospan automodulation |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DATA BURST |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] -SMC=x [cmds] |
|--------------+---------------------------------------------|
| Description: | Controls the ML144 data burst |
|------------------------------------------------------------|
| Command | Function |
|---------------------+--------------------------------------|
| x=0 | Disable data burst |
|---------------------+--------------------------------------|
| x=1 | Enable data burst |
+------------------------------------------------------------+
Synchronous Access Command Set
+------------------------------------------------------------+
| DATA COMPRESSION |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] +DS=w,x,y,z [cmds] |
|--------------+---------------------------------------------|
| Description: | Enables synchronous access mode |
|------------------------------------------------------------|
| Command | Function |
|---------------+--------------------------------------------|
| w=0 | Negotiated, no compression |
|---------------+--------------------------------------------|
| w=1 | Transmit only |
|---------------+--------------------------------------------|
| w=2 | Receive only |
|---------------+--------------------------------------------|
| w=3 | Transmit and receive |
|---------------+--------------------------------------------|
| x=0 | Do not disconnect if V.42bis is not |
| | negotiated by the remote DCE as specified |
| | in the Direction parameter |
|---------------+--------------------------------------------|
| x=1 | Disconnect if V.42bis is not negotiated by |
| | the remote DCE as specified in the |
| | Direction parameter |
|------------------------------------------------------------|
| y= | Specifies the maximum number of dictionary |
| | entries which should be negotiated. |
| | Range=512 - 6553 |
|------------------------------------------------------------|
| z= | Specified the maximum string length to be |
| | negotiated. Range=6 - 250 Default=6 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SYNCHRONOUS ACCESS MODE |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] +ES=x,y,z [cmds] |
|--------------+---------------------------------------------|
| Description: | Enables synchronous access mode |
|------------------------------------------------------------|
| Command | Function |
|---------------+--------------------------------------------|
| x=0 | Direct mode |
|---------------+--------------------------------------------|
| x=1 | Initiate call with buffered mode only |
|---------------+--------------------------------------------|
| x=2 | Initiate V.42 withput detection phase. If |
| | V.8 is in use, disable V.42 detection |
| | phase |
|---------------+--------------------------------------------|
| x=3 | Initiate V.42 with detection phase |
|---------------+--------------------------------------------|
| x=4 | Initiate alternative protocol |
|------------------------------------------------------------|
| y=0 | Error control optional; if error control is |
| | not established, maintain DTE-DCE data rate |
| | and use buffered mode with flow control |
| | during non-error-control operation |
|--------------+---------------------------------------------|
| y=1 | Error control optional; if error control is |
| | not established, change DTE-DCE data rate |
| | to match line rate and use direct mode |
|--------------+---------------------------------------------|
| y=2 | Error control optional; if error control is |
| | not established, disconnect |
|--------------+---------------------------------------------|
| y=3 | Error control optional; if error control is |
| | not established, disconnect |
|--------------+---------------------------------------------|
| y=4 | Error control required; if error control is |
| | not established, disconnect |
|------------------------------------------------------------|
| z=0 | Direct mode |
|---------------+--------------------------------------------|
| z=1 | Error control disabled, use buffered mode |
|---------------+--------------------------------------------|
| z=2 | Error control optional; if error control |
| | is not established, maintain DTE-DCE data |
| | rate and use local buffering and flow |
| | control during non-error-control operation |
|---------------+--------------------------------------------|
| z=3 | Error control optional; if error control |
| | is not established, change DTE-DCE data |
| | rate to match line rate and use direct |
| | mode |
|---------------+--------------------------------------------|
| z=4 | Error control optional; if error control |
| | is not established, disconnect |
|---------------+--------------------------------------------|
| z=5 | Error control optional; if error control |
| | is not established, disconnect |
|---------------+--------------------------------------------|
| z=6 | Error control required; if error control |
| | is not established, disconnect |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SYNCHRONOUS ACCESS SUBMODE |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] +ESA=a,b,c,d,e,f,g,h [cmds] |
|--------------+---------------------------------------------|
| Description: | Sets the synchronous access submode |
|------------------------------------------------------------|
| Command | Function |
|---------------+--------------------------------------------|
| a=0 | In transparent sub-mode, modem transmits |
| | 8-bit SYN sequence on idle. Modem receiver |
| | does not hunt for synchronized sequence. |
|---------------+--------------------------------------------|
| A=1 | In transparent sub-mode, modem transmits |
| | 8-bit SYN sequence on idle. Modem receiver |
| | hunts for 8-bit sequence |
|---------------+--------------------------------------------|
| a=2 | In transparent sub-mode, modem transmits |
| | 16-bit SYN sequence on idle. Modem |
| | receiver hunts for 16-bit sequence |
|------------------------------------------------------------|
| b=0 | In framed sub-mode, modem transmits HDLC |
| | flags on idle. |
|--------------+---------------------------------------------|
| B=1 | In framed sub-mode, DCE transmits marks on |
| | idle |
|------------------------------------------------------------|
| c=0 | In framed sub-mode, modem transmits abort |
| | on underrun in middle of frame |
|---------------+--------------------------------------------|
| c=1 | In framed sub-mode, DCE transmits a flag |
| | on underrun in middle of frame, and |
| | notifies DTE of underrun of overrun |
|---------------+--------------------------------------------|
| d=0 | When switching between primary and |
| | secondary channel operation in V.34 half |
| | duplex, the DCE only executes those |
| | procedures difined in section 12/V.34 |
|---------------+--------------------------------------------|
| d=1 | When switching between primary and |
| | secondary channel operation in V.34 half |
| | duplex, the DCE executes additional |
| | procedures as described in section 8.8.5 |
| | besides those difined in section 12/V.34 |
|---------------+--------------------------------------------|
| e=0 | CRC generation and checking disabled |
|---------------+--------------------------------------------|
| e=1 | In framed mode, the 16-bit CRC is |
| | generated by the modem in the transmit |
| | direction, and checked by the modem in the |
| | receive direction |
|---------------+--------------------------------------------|
| e=2 | In framed sub-mode, the 32-bit CRC is |
| | generated by the DCE in the transmit |
| | direction, and checked by the DCE in the |
| | receive direction |
|---------------+--------------------------------------------|
| f=0 | NRZI encoding and decoding disabled |
|---------------+--------------------------------------------|
| f=1 | NRZI encoding enabled in the DCE in the |
| | transmit direction, and NRZI decoding |
| | enabled in the DCE in the receive |
| | direction. |
|---------------+--------------------------------------------|
| G | Specifies the octet value to be used while |
| | performing character-oriented framing. |
|---------------+--------------------------------------------|
| H | Specifies the octet value to be used while |
| | performing character-oriented framing. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SYNCHRONOUS ACCESS SUBMODE |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] +ESR=a [cmds] |
|--------------+---------------------------------------------|
| Description: | Sets the synchronous access submode |
|------------------------------------------------------------|
| Command | Function |
|---------------+--------------------------------------------|
| a=0 | Do not use SREJ |
|---------------+--------------------------------------------|
| a=1 | Use SREJ if available in remote DCE; |
| | continue without it if not |
|---------------+--------------------------------------------|
| a=2 | Use SREJ if available in remote DCE, |
| | continue id SREJ is not available |
+------------------------------------------------------------+
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 |
|--------------+---------------------------------------------|
| 6 | Remote modem failed to respond to feature |
| | negotiation |
|--------------+---------------------------------------------|
| 7 | Local modem is asynchronous-only, remote |
| | modem is synchronous-only |
|--------------+---------------------------------------------|
| 8 | No common framing technique found |
|--------------+---------------------------------------------|
| 9 | No common protocol found |
|--------------+---------------------------------------------|
| 10 | Remote modem sent erroneous feature |
| | negotiation message |
|--------------+---------------------------------------------|
| 11 | Remote modem failed to send synchronous |
| | information |
|--------------+---------------------------------------------|
| 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 |
|--------------+---------------------------------------------|
| 15 | Negotiated compression failed |
|--------------+---------------------------------------------|
| 16 | Line speeds selected in S37 and S109 did |
| | not match |
|--------------+---------------------------------------------|
| 17 | Time limit reached according to parameters |
| | set in S116 |
|--------------+---------------------------------------------|
| 18 | Incompatible speeds |
|--------------+---------------------------------------------|
| 19 | BREAK disconnect |
|--------------+---------------------------------------------|
| 20 | Key abort |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DCE LINE SPEED |
|------------------------------------------------------------|
| Type: | Register |
|--------------+---------------------------------------------|
| Format | AT [cmds] S37=n [cmds] |
|--------------+---------------------------------------------|
| Description: | Sets the maximum allowable data exchange |
| | rate attempted during handshake process. |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| í S37=0 | Speed of last connection |
|--------------+---------------------------------------------|
| S37=1 | 300bps |
|--------------+---------------------------------------------|
| S37=5 | 1200bps |
|--------------+---------------------------------------------|
| S37=6 | 2400bps |
|--------------+---------------------------------------------|
| S37=8 | 4800bps |
|--------------+---------------------------------------------|
| S37=9 | 9600bps |
|--------------+---------------------------------------------|
| S37=10 | 12.0Kbps |
|--------------+---------------------------------------------|
| S37=11 | 14.4Kbps |
|--------------+---------------------------------------------|
| S37=12 | 7200bps |
+------------------------------------------------------------+
+------------------------------------------------------------+
| ERROR CORRECTION NEGOTIATION |
|------------------------------------------------------------|
| 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. |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| S36=0 | Hang up |
|--------------+---------------------------------------------|
| S36=1 | Attempt a direct connection |
|--------------+---------------------------------------------|
| S36=3 | Attempt a buffered connection |
|--------------+---------------------------------------------|
| S36=4 | Attempt a connection at MNP2-4; if that |
| | fails, hang up. |
|--------------+---------------------------------------------|
| S36=5 | Attempt a connection at MNP2-4; if that |
| | fails, attempt a direct connection. |
|--------------+---------------------------------------------|
| Í S36=7 | Attempt a connection at MNP2-4; if that |
| | fails, attempt a buffered connection. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| EXTENDED RESULT CODES |
|------------------------------------------------------------|
| Type: | Register |
|--------------+---------------------------------------------|
| Format | AT [cmds] S95=n [cmds] |
|--------------+---------------------------------------------|
| Default: | 0 |
|--------------+---------------------------------------------|
| Range: | 0-255 |
|--------------+---------------------------------------------|
| Unit: | Bit-mapped |
|--------------+---------------------------------------------|
| Description: | Works in combination with the Wn command to |
| | enable extended result codes. Features |
| | enabled by S95 take precedence over the |
| | options selected by Wn. |
|--------------+---------------------------------------------|
| Bit | Value | Function |
|------+-------+---------------------------------------------|
| 1 | í 0 | Verbose CONNECT result codes display DTE or |
| | | line speed only. |
| | 1 | |
| | | Adds "/ARQ" to all verbose CONNECT result |
| | | codes except "NONE." |
|------+-------+---------------------------------------------|
| 2 | í 0 | CARRIER result codes disabled. |
| | | |
| | 1 | CARRIER result codes enabled. |
|------+-------+---------------------------------------------|
| 4 | 0 | Enable CARRIER XXXX result code |
|------+-------+---------------------------------------------|
| 8 | 0 | Enable PROTOCOL XXXX result code |
|------+-------+---------------------------------------------|
| 16 | 0 | Reserved |
|------+-------+---------------------------------------------|
| 32 | 0 | Compression result code |
|------+-------+---------------------------------------------|
| 64 | 0 | Enable TX and RX V.34 CARRIER result code |
| | | if in asymetric carrier mode |
|------+-------+---------------------------------------------|
| 128 | 0 | Reserved |
+------------------------------------------------------------+
+------------------------------------------------------------+
| FEATURE NEGOTIATION OPTIONS |
|------------------------------------------------------------|
| Type: | Register |
|------------------------------------------------------------|
| Format: | AT [cmds] S48=n [cmds] |
|--------------+---------------------------------------------|
| Description: | Selects active error correction and |
| | compression protocols |
|------------------------------------------------------------|
| Command | Function |
|---------------+--------------------------------------------|
| S48=0 | Detection negotiation disabled, XID |
| | negotiation disabled |
|---------------+--------------------------------------------|
| í S48=7 | Detection negotiation and XID negotiation |
| | enabled |
|---------------+--------------------------------------------|
| S48=128 | Fall-back to options set in S36 |