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# QUADRANT COMPONENTS, INC.
CHOICE 33.6 VOICE
Card Type Modem (asynchronous)
Chipset U.S. Robotics
I/O Options Microphone in, speaker out, voice,
speakerphone
Maximum Data Rate 33.6Kbps
Maximum Fax Rate 14.4Kbps
Data Modulation Bell 103A, 212A
ITU-T V.21, V.22, V.22bis, V.32,
V.32bis, V.34
Fax Modulation Unidentified
Error MNP5, V.42, V.42bis
Correction/Compression
Fax Class Class I & II
Data Bus 8-bit ISA
Card Size Full height, half length
(IMG) IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Function | Label | Function | Label |
|--------------------+----------+------------------+---------|
| Telephone line | CN1 | Speaker out or | CN3 |
| | | microphone in | |
|--------------------+----------+------------------+---------|
| Telephone line | CN2 | Speaker out or | CN4 |
| | | microphone in | |
|------------------------------------------------------------|
| Note: It is not known which one of CN3 and CN4 is the |
| speaker out and which is the microphone in. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Setting | Label | Position |
|----------------------------------------+-------+-----------|
| Speaker out connector is stereo | JP5 | Closed |
|----------------------------------------+-------+-----------|
| Speaker out connector is mono | JP5 | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SERIAL PORT ADDRESS SELECTION |
|------------------------------------------------------------|
| Setting | JP1/A | JP1/B | JP1/C |
|---------------+--------------+--------------+--------------|
| 3F8h (COM1:) | Closed | Closed | Closed |
|---------------+--------------+--------------+--------------|
| 2F8h (COM2:) | Open | Closed | Closed |
|---------------+--------------+--------------+--------------|
| 3E8h (COM3:) | Closed | Open | Closed |
|---------------+--------------+--------------+--------------|
| 2E8h (COM4:) | Open | Open | Closed |
|---------------+--------------+--------------+--------------|
| í Plug-N-Play | Open | Open | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| INTERRUPT SELECTION |
|------------------------------------------------------------|
| Setting | JP2/A | JP2/B | JP2/C | JP2/D | JP2/E |
|---------------+--------+--------+--------+--------+--------|
| 2 | Closed | Open | Open | Open | Open |
|---------------+--------+--------+--------+--------+--------|
| 3 | Open | Closed | Open | Open | Open |
|---------------+--------+--------+--------+--------+--------|
| 4 | Open | Open | Closed | Open | Open |
|---------------+--------+--------+--------+--------+--------|
| 5 | Open | Open | Open | Closed | Open |
|---------------+--------+--------+--------+--------+--------|
| 7 | Open | Open | Open | Open | Closed |
|---------------+--------+--------+--------+--------+--------|
| í Plug-N-Play | Open | Open | Open | Open | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SUPPORTED STANDARD COMMANDS |
|------------------------------------------------------------|
| Basic AT Commands |
|------------------------------------------------------------|
| +++, ‘comma’, A/ |
|------------------------------------------------------------|
| A, B, C, E, F, H, L, M, O, P, T, V, X |
|------------------------------------------------------------|
| &C, &D, &G, &P, &R, &S, &T, &W, &Z |
|------------------------------------------------------------|
| S-Registers |
|------------------------------------------------------------|
| S0, S1, S2, S3, S4, S5, S6, S7, S8, S9, S10, S11, S12, |
| S18, S25, S38 |
|------------------------------------------------------------|
| Note: See MHI help file for complete information. |
+------------------------------------------------------------+
Proprietary AT Command Set
+------------------------------------------------------------+
| DIAL |
|------------------------------------------------------------|
| Type: | Immediate |
|--------------+---------------------------------------------|
| Format: | AT [cmds] D<#>;[cmds] |
|--------------+---------------------------------------------|
| Description: | Dials the telephone number indicated |
| | according to any modifiers included in the |
| | string. |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| DL | Re-dial last number. |
|--------------+---------------------------------------------|
| DP | Pulse dialing enabled. |
|--------------+---------------------------------------------|
| DR | Answer mode enabled; originate mode |
| | disabled following handshake initiation. |
|--------------+---------------------------------------------|
| DSn | Dial stored telephone number n. |
|--------------+---------------------------------------------|
| DT | Tone dialing enabled. |
|--------------+---------------------------------------------|
| DW | Dialing resumed following dial tone |
| | detection. |
|--------------+---------------------------------------------|
| D, | Dialing paused for amount of time specified |
| | in S8 register. |
|--------------+---------------------------------------------|
| D/ | Dialing paused for 1/8 second. |
|--------------+---------------------------------------------|
| 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. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DISPLAY CHIPSET MANUFACTURER |
|------------------------------------------------------------|
| Type: | Immediate |
|--------------+---------------------------------------------|
| Format: | AT [cmds] #MFR? [cmds] |
|--------------+---------------------------------------------|
| Description: | Displays the voice chipset manufacturer’s |
| | name. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DISPLAY CHIPSET MODEL NAME |
|------------------------------------------------------------|
| Type: | Immediate |
|--------------+---------------------------------------------|
| Format: | AT [cmds] #MDL? [cmds] |
|--------------+---------------------------------------------|
| Description: | Displays the model name of the modem's |
| | voice chipset. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DISPLAY CHIPSET REVISION |
|------------------------------------------------------------|
| Type: | Immediate |
|--------------+---------------------------------------------|
| Format: | AT [cmds] #REV? [cmds] |
|--------------+---------------------------------------------|
| Description: | Displays the revision level of the modem's |
| | voice chipset. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| FLOW CONTROL - MODEM-TO-MODEM |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] &In [cmds] |
|--------------+---------------------------------------------|
| Description: | Selects the type of modem-to-modem flow |
| | control used. |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| &I0 | Software flow control disabled. |
|--------------+---------------------------------------------|
| &I1 | XON/XOFF pass-through enabled. |
|--------------+---------------------------------------------|
| &I2 | XON/XOFF pass-through disabled. |
|--------------+---------------------------------------------|
| &I3 | Hewlett-Packard ENQ/ACK host mode enabled. |
|--------------+---------------------------------------------|
| &I4 | Hewlett-Packard ENQ/ACK terminal mode |
| | enabled. |
|--------------+---------------------------------------------|
| &I5 | XON/XOFF pass-through enabled in normal |
| | mode and disabled in error-correcting mode. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| MODE SELECTION |
|------------------------------------------------------------|
| Type: | Immediate |
|--------------+---------------------------------------------|
| Format: | AT [cmds] #CLS=n [cmds] |
|--------------+---------------------------------------------|
| Description: | Selects which mode the modem will operate |
| | in. |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| #CLS=0 | Modem will operate in data mode. |
|--------------+---------------------------------------------|
| #CLS=1 | Modem will operate in fax class I mode. |
|--------------+---------------------------------------------|
| #CLS=2 | Modem will operate in fax class II mode. |
|--------------+---------------------------------------------|
| #CLS=8 | Modem will operate in voice mode. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| PROFILE ON POWER-UP |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] Yn [cmds] |
|--------------+---------------------------------------------|
| Description: | Selects the profile that the modem will |
| | reset to on power-up. |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| í Y0 | Modem resets to user profile 0 on power-up. |
|--------------+---------------------------------------------|
| Y1 | Modem resets to user profile 1 on power-up. |
|--------------+---------------------------------------------|
| Y2 | Modem resets to factory generic profile on |
| | power-up. |
|--------------+---------------------------------------------|
| Y3 | Modem resets to factory hardware flow |
| | control profile on power-up. |
|--------------+---------------------------------------------|
| Y4 | Modem resets to factory software flow |
| | control profile on power-up. |
|--------------+---------------------------------------------|
| Y6 | Displays link diagnostics. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| STATUS REGISTER BIT |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | Write: AT [cmds] Sn.m=0 or 1 [cmds] |
| | |
| | Read: AT [cmds] Sn.m? [cmds] |
|--------------+---------------------------------------------|
| Description: | Sets/clears or reads bit m of register n. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| TONE DETECTION |
|------------------------------------------------------------|
| Format: | AT [cmds] #VTD=x,y,z [cmds] |
|----------------+-------------------------------------------|
| Default: | x,y,z 63 |
|----------------+-------------------------------------------|
| Range: | 0 - 63 |
|----------------+-------------------------------------------|
| Description: | Sets which tones the tone detection will |
| | report. |
|----------------+-------------------------------------------|
| Note: | The value of x sets the tone detection |
| | modes in voice transmit mode, y sets them |
| | in voice receive mode, and z sets them in |
| | voice command mode. |
|------------------------------------------------------------|
| Bit | Value | Function |
|---------+-------+------------------------------------------|
| 0 | 0 | DTMF tones are not detected. |
| | | |
| | í 1 | DTMF tones are detected. |
|------------------------------------------------------------|
| 1 | 0 | V.25 1300Hz calling tone is not |
| | | detected. |
| | í | |
| | 1 | V.25 1300Hz calling tone is detected. |
|-------------+----+-----------------------------------------|
| 2 | 0 | T.30 1100Hz fax tone is not detected. |
| | | |
| | í | T.30 1100Hz fax tone is detected. |
| | 1 | |
|-------------+----+-----------------------------------------|
| 3 | 0 | V.25/T.30 2100Hz answer tone is not |
| | | detected. |
| | í | |
| | 1 | V.25/T.30 2100Hz answer tone is |
| | | detected. |
|-------------+----+-----------------------------------------|
| 4 | 0 | Bell 2225Hz answer tone is not |
| | | detected. |
| | í | |
| | 1 | Bell 2225Hz answer tone is detected. |
|-------------+----+-----------------------------------------|
| 5 | 0 | Call progress tones are not detected. |
| | | |
| | í | Call progress tones are detected. |
| | 1 | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| TONE GENERATOR - DIRECT ENTRY |
|------------------------------------------------------------|
| Type: | Immediate |
|--------------+---------------------------------------------|
| Format: | AT [cmds] #VTS=[m, n, x] |
|--------------+---------------------------------------------|
| Range: | m 200-3000, n 200-3000, x 0-255 |
|--------------+---------------------------------------------|
| Unit: | m 1 Hz, n 1 Hz, x .1 second |
|--------------+---------------------------------------------|
| Description: | Generates a dual-frequency tone for |
| | duration x at frequencies m and n. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| TONE GENERATOR - TIMED PHONE KEYS |
|------------------------------------------------------------|
| Type: | Immediate |
|--------------+---------------------------------------------|
| Format: | AT [cmds] #VTS={a, n} |
|--------------+---------------------------------------------|
| Range: | a 0-9, A-D, #, *; x 0-255 |
|--------------+---------------------------------------------|
| Unit: | x .1 second |
|--------------+---------------------------------------------|
| Description: | Generates the DTMF tone for duration x for |
| | the character a. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| TONE GENERATOR - PHONE KEYS |
|------------------------------------------------------------|
| Type: | Immediate |
|--------------+---------------------------------------------|
| Format: | AT [cmds] #VTS=a |
|--------------+---------------------------------------------|
| Range: | 0-9, A-D, #, * |
|--------------+---------------------------------------------|
| Description: | Generates the DTMF tones for the characters |
| | in the string for the duration set with |
| | +VBT. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| TONE GENERATOR LENGTH |
|------------------------------------------------------------|
| Format | AT [cmds] #VBT=n [cmds] |
|--------------+---------------------------------------------|
| Default: | 10 |
|--------------+---------------------------------------------|
| Range: | 0 - 40 |
|--------------+---------------------------------------------|
| Unit: | 0.1 second |
|--------------+---------------------------------------------|
| Description: | Sets the length of DTMF tones that are |
| | generated. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| VOICE BUFFER SPACE |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] #VSK=n [cmds] |
|--------------+---------------------------------------------|
| Default: | 255 |
|--------------+---------------------------------------------|
| Range: | 0 - 255 |
|--------------+---------------------------------------------|
| Unit: | 1 byte |
|--------------+---------------------------------------------|
| Description: | Sets the amount of data the modem can send |
| | into the buffer after the XOFF signal is |
| | sent. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| VOICE DEVICE |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] #VLS=n [cmds] |
|--------------+---------------------------------------------|
| Description: | Selects the I/O device for the DSP chip. |
|--------------+---------------------------------------------|
| Note: | This modem may not support all options |
| | listed below. The #VLS? command will |
| | display the available options. |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| í #VLS=0 | Telephone line and handset used for voice |
| | I/O. |
|--------------+---------------------------------------------|
| #VLS=1 | Telephone handset used for voice I/O. |
|--------------+---------------------------------------------|
| #VLS=2 | Internal speaker only used for voice I/O. |
|--------------+---------------------------------------------|
| #VLS=3 | External microphone only used for voice |
| | I/O. |
|--------------+---------------------------------------------|
| #VLS=4 | Telephone line and handset used for voice |
| | I/O; internal speaker enabled. |
|--------------+---------------------------------------------|
| #VLS=5 | Headset used for voice I/O. |
|--------------+---------------------------------------------|
| #VLS=6 | Speakerphone used for voice I/O. |
|--------------+---------------------------------------------|
| #VLS=7 | Handset muted by disconnecting handset or |
| | speakerphone from telephone line. |
|--------------+---------------------------------------------|
| #VLS=8 | Connects caller ID relay for recording of |
| | conversation over handset. |
|--------------+---------------------------------------------|
| #VLS=9 | Connects handset (or speakerphone) to DSP |
| | chip for recording or playback. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| VOICE - DISPLAY BUFFER SIZE |
|------------------------------------------------------------|
| Type: | Immediate |
|--------------+---------------------------------------------|
| Format: | AT [cmds] #VBQ? [cmds] |
|--------------+---------------------------------------------|
| Description: | Displays the size of the voice buffer. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| VOICE - DISPLAY COMPRESSION TYPE |
|------------------------------------------------------------|
| Type: | Immediate |
|--------------+---------------------------------------------|
| Format: | AT [cmds] #VCI? [cmds] |
|--------------+---------------------------------------------|
| Description: | Displays the type of compression currently |
| | in use. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| VOICE - LOCAL SERIAL PORT SPEED |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] #BDR=n [cmds] |
|--------------+---------------------------------------------|
| Default: | 0 |
|--------------+---------------------------------------------|
| Range: | 0 - 48 |
|--------------+---------------------------------------------|
| Unit: | 2400bps |
|--------------+---------------------------------------------|
| Description: | Sets the speed of the local serial port |
| | when in voice mode. A value of 0 indicates |
| | that the modem should auto-detect the |
| | correct serial port speed. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| VOICE RE-RING DETECT TIME |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] #VRA=n [cmds] |
|--------------+---------------------------------------------|
| Default: | 70 |
|--------------+---------------------------------------------|
| Range: | 0-255 |
|--------------+---------------------------------------------|
| Unit: | 10 mS |
|--------------+---------------------------------------------|
| Description: | Sets the maximum time the modem will wait |
| | for the remote station to ring again before |
| | it assumes that it has gone off-hook. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| VOICE RECEIVE |
|------------------------------------------------------------|
| Type: | Immediate |
|--------------+---------------------------------------------|
| Format: | AT [cmds] #VRX |
|--------------+---------------------------------------------|
| Description: | Commands the modem to begin receiving voice |
| | data. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| VOICE RING DETECT TIME |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] #VRN=n [cmds] |
|--------------+---------------------------------------------|
| Default: | Unidentified |
|--------------+---------------------------------------------|
| Range: | Unidentified |
|--------------+---------------------------------------------|
| Unit: | Unidentified |
|--------------+---------------------------------------------|
| Description: | Sets the maximum time the modem will wait |
| | for the remote station to ring before it |
| | assumes that it went off-hook before it |
| | rang. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| VOICE SAMPLE QUALITY |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] #VBS=n [cmds] |
|--------------+---------------------------------------------|
| Description: | Selects the number of bits per sample that |
| | the modem records. |
|--------------+---------------------------------------------|
| Note: | This modem may not support all options |
| | listed below. The #VBS? command will |
| | display the available options. |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| #VBS=2 | Modem records 2 bits per sample in ADPCM |
| | encoding. |
|--------------+---------------------------------------------|
| #VBS=3 | Modem records 3 bits per sample in ADPCM |
| | encoding. |
|--------------+---------------------------------------------|
| í #VBS=4 | Modem records 4 bits per sample in ADPCM |
| | encoding. |
|--------------+---------------------------------------------|
| #VBS=8 | Modem records 8 bits per sample in PCM |
| | encoding. |
|--------------+---------------------------------------------|
| #VBS=16 | Modem records 16 bits per sample in PCM |
| | encoding. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| VOICE SAMPLING RATE |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] #VSR=n [cmds] |
|--------------+---------------------------------------------|
| Description: | Sets the sampling rate used when recording |
| | voice signals. |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| í #VSR=7200 | Selects a sampling rate of 7.2KHz. |
|--------------+---------------------------------------------|
| #VSR=11025 | Selects a sampling rate of 11.025KHz in PCM |
| | encoding only. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| VOICE SILENCE DETECTION TIME |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] #VSP=n [cmds] |
|--------------+---------------------------------------------|
| Default: | Unidentified |
|--------------+---------------------------------------------|
| Range: | 0 - 255 |
|--------------+---------------------------------------------|
| Unit: | .1 second |
|--------------+---------------------------------------------|
| Description: | Sets the minimum amount of silence that the |
| | modem will detect. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| VOICE SILENCE DETECTION THRESHOLD |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] #VSS=n [cmds] |
|--------------+---------------------------------------------|
| Description: | Sets the threshold of sensitivity that the |
| | modem uses to determine silence detection. |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| #VSS=0 | Silence detection disabled. |
|--------------+---------------------------------------------|
| #VSS=1 | Minimum silence detection sensitivity. |
|--------------+---------------------------------------------|
| #VSS=2 | Standard silence detection sensitivity. |
|--------------+---------------------------------------------|
| #VSS=3 | Maximum silence detection sensitivity. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| VOICE TRANSMIT |
|------------------------------------------------------------|
| Type: | Immediate |
|--------------+---------------------------------------------|
| Format: | AT [cmds] #VTX |
|--------------+---------------------------------------------|
| Description: | Commands the modem to begin transmitting |
| | voice data. |
+------------------------------------------------------------+
Proprietary AT Command Set
See QUADRANT COMPONENTS, INC. CHOICE 33.6 for a full command
summary.