Card Type	Fax, Modem (synchronous/asynchronous)
Chip Set	Unidentified
Maximum Data Rate	28.8Kbps
Maximum Fax Rate	14.4Kbps
Data Bus	External
Fax Class	Class I
Data Modulation Protocol	Bell 103/212A ITU-T V.21, V.22, V.22bis, V.32, V.32bis, V.34 Rockwell V.FC
Fax Modulation Protocol	ITU-T V.17, V.27ter, V.29
Error Correction/Compression	MNP5, V.42, V.42bis

CONNECTIONS
Function	Label		Function		Label
Line out/in - Unidentified		CN1		DC power		CN4
Line in/out - Unidentified		CN2		Power switch		SW1
RS-232/422		CN3

DIAGNOSTIC LED(S)
LED	Color	Status	Condition
OH	Red	On	Modem is off-hook
OH	Red	Off	Modem is on-hook
RD	Red	On	Modem is receiving data
RD	Red	Off	Modem is not receiving data
SD	Red	On	Modem is transmitting data
SD	Red	Off	Modem is not transmitting data
PWR	Red	On	Power is on
PWR	Red	Off	Power is off

ACCEPT MNP RELIABLE MODE
Type:	Immediate
Format:	AT [cmds] \U [cmds]
Description:	Accept remote modem’s request for MNP reliable mode

AUTO-FALLBACK/FALL-FORWARD
Type:	Configuration
Format:	AT [cmds] %Gn [cmds]
Description:	Selects auto-fallback/fall-forward
Command	Function
%G0	Auto-fallback/fall-forward disabled
í %G1	Auto-fallback/fall-forward enabled

AUTO-RETRAIN
Type:	Configuration
Format:	AT [cmds] %En [cmds]
Description:	Controls auto-retrain mode
Command	Function
í %E0	Auto-retrain disabled
%E1	Auto-retrain enabled

AUXCTL OUTPUT LINE CONTROL
Type:	Configuration
Format:	AT [cmds] %Mn [cmds]
Description:	Controls AUXCTL output line level
Note: Function varies by model
Command		Function
í %M0		Line high only while modem in synchronous data mode
%M1		Line low only while modem in synchronous data mode

BIT-MAPPED REGISTER S14
Format:		AT [cmds] S14=n [cmds]
Default:		Unidentified
Range:		0-174
Unit:		Bit-mapped
Description:		Controls echo, result codes and display, dial mode, and answer/originate mode.
Bit	Value	Function
0	í 0	Not used
1	0 í 1	Command echo disabled Command echo enabled
2	í 0 1	Result codes enabled Result codes disabled
3	0 í 1	Display result codes in numeric format Display result codes in verbose format
4	í 0	Not used
5	í 0 1	Tone dial enabled Pulse dial enabled
6	í 0	Not used
7	0 1	Answer mode enabled Originate mode enabled

BIT-MAPPED REGISTER S21
Format		AT [cmds] S21=n [cmds]
Default:		4
Range:		0-253
Unit:		Bit-mapped
Description:		Selects jack type, CTS/DCD/DSR signals, low DTR action, and the long space disconnect function.
Bit	Value	Function
0	í 0 1	Selects RJ-11, RJ-41S, or RJ45S jack Selects RJ-12 or RJ-13 jack
1	í 0	Not used
2	0 í 1	CTS forced high CTS follows RTS
4, 3	í 00 01 10 11	Modem does not respond to DTR Modem hangs-up and sends "OK" result code Modem goes to command mode after DTR goes is off Modem goes to command mode and disconnects (hangs up) after DTR goes off; Auto-Answer is disabled.
5	í 0 1	DCD forced high DCD normal
6	í 0 1	DSR forced high DSR normal
7	í 0 1	Long space disconnect function disabled Long space disconnect function enabled

BIT-MAPPED REGISTER S22
Format		AT [cmds] S22=n [cmds]
Default:		118
Range:		0-127
Unit:		Bit-mapped
Description:		Controls speaker volume and controls, and limits results codes.
Bit	Value	Function
1, 0	00 01 í 10 11	Low level volume Low level volume Medium level volume High level volume
3, 2	00 í 01 10 11	Speaker off Speaker off on carrier Speaker always on Speaker on during handshake
6 - 4	000 100 101 110 í 111	Basic result codes only enabled Basic and connection speed result codes enabled Basic and connection speed result codes and dialtone detection enabled All result codes except dialtone detection enabled All result codes enabled

BIT-MAPPED REGISTER S23
Format		AT [cmds] S23=n [cmds]
Default:		55
Range:		0-189
Unit:		Bit-mapped
Description:		Grants/denies remote digital loopback, controls DTE rate and parity, and sets guard tone.
Bit	Value	Function
0	0 í 1	Remote digital loopback denied Remote digital loopback allowed
3 - 1	000 001 010 í 011 100 101 110	Sets serial port speed to 0-300bps Sets serial port speed to 600bps Sets serial port speed to 1200bps Sets serial port speed to 2400bps Sets serial port speed to 4800bps Sets serial port speed to 9600bps Sets serial port speed to 19200bps
5, 4	00 01 10 í 11	Parity even Not Used Parity odd No Parity
7, 6	í 00 01 10	Guard tone disabled Guard tone 550Hz enabled Guard tone 1800Hz enabled

BIT-MAPPED REGISTER S27
Format		AT [cmds] S27=n [cmds]
Default:		73
Range:		0-11
Unit:		Bit-mapped
Description:		Selects synchronous/asynchronous mode, line type, clock source, and ITU-T/Bell modes.
Bit	Value	Function
3, 1, 0	000 001 010 011 100 í 101 110	Asynchronous Direct mode Asynchronous off-line command mode and synchronous connect mode Asynchronous off-line command mode - modem autodials first number in directory, then synchronous connect mode. Asynchronous off-line command mode on low DTR, synchronous connect mode on high DTR. Not Used Asynchronous Reliable Mode Asynchronous Normal Mode
2	í 0 1	Switched line (PSTN/Dial-up) Leased line
5, 4	í 00 01 10	Modem generates clock DTE generates clock Modem generates clock from the receive carrier signal
6	0 í 1	ITU/T mode Bell mode

BIT-MAPPED REGISTER S28
Format		AT [cmds] S28=n [cmds]
Default:		Unidentified
Range:		0-31
Unit:		Bit-mapped
Description:		Controls V.23 split speed, transmit/receive speed, half duplex; and pulse dialing.
Bit	Value	Function
0	í 0 1	V.23 split speed operation disabled V.23 split speed operation enabled
1	0 1	75bps transmit, 1200bps receive enabled 1200bps transmit, 75bps receive enabled
2	0 1	V.23 half-duplex disabled 1200bps transmit, 1200bps receive enabled
4, 3	í 00 01 10 11	39ms make/61ms break at 10pps 33ms make/67ms break at 10pps 39ms make/61ms break at 20pps 33ms make/67ms break at 20pps

BIT-MAPPED REGISTER S31
Format:		AT [cmds] S31=n [cmds]
Default:		2
Range:		0-10
Description:		Select automode and extended result code format.
Bit	Value		Function
0	í 0		Not used
1	0 í 1		Auto-mode disabled Auto-mode ensabled
3, 2	í 00 01 10		Enables CONNECT result codes to report DTE speed Full reporting of CONNECT result codes Enables CONNECT result codes to report DCE speed

BIT-MAPPED REGISTER S40
Format		AT [cmds] S40=n [cmds]
Default:		Unidentified
Range:		0-239
Unit:		Bit-mapped
Description:		Controls power level and break handling; selects MNP extended services, link negotiation, and block size.
Bit	Value	Function
0	0 1	V.42 LAPM to MNP 10 connection disabled V.42 LAPM to MNP 10 connection enabled
1	0 í 1	Power level adjustment disabled Power level adjustment enabled
2	í 0 1	Link will be negotiated at highest possible speed Link will be negotiated at 1200bps
5, 4, 3	000 001 010 011 100 í 101	\K0 \K1 \K2 \K3 \K4 \K5
7, 6	00 01 í 10 11	MNP block size is 64 characters MNP block size is 128 characters MNP block size is 192 characters MNP block size is 256 characters

BIT-MAPPED REGISTER S41
Format		AT [cmds] S41=n [cmds]
Default:		Unidentified
Range:		0-31
Unit:		Bit-mapped
Description:		Selects compression, auto-retrain, flow control, and MNP mode.
Bit	Value	Function
1 - 0	00 01 10 11	Data compression disabled MNP5 enabled V.42bis enabled MNP5 and V.42bis enabled
2	í 0 1	Auto-retrain disabled Auto-retrain enabled
3	í 0 1	Flow control disabled Flow control enabled
4	í 0 1	Stream mode for MNP Block mode for MNP

BREAK SEND
Type:	Configuration
Format:	AT [cmds] \Bn [cmds]
Default:	Unidentified
Range:	1-9
Unit:	.1 second
Description:	Sends break to modem in non-error correction state

BREAK TYPE
Type:		Configuration
Format:		AT [cmds] \Kn [cmds]
Description:		Configures action of break signal
Command	Break from DTE		Modem receives \B	Break received from remote modem
\K0	Online command mode enabled, send no break to remote modem		Break sent to remote modem and buffers cleared	Buffers cleared, break sent to DTE
\K1	Break sent to remote modem and buffers cleared		Break sent to remote modem and buffers cleared	Buffers cleared, break sent to DTE
\K2	Online command mode enabled, send no break to remote modem		Send break to remote modem immediately	Break sent immediately to DTE
\K3	Send break to remote modem immediately		Send break to remote modem immediately	Break sent immediately to DTE
\K4	Online command mode enabled, send no break to remote modem		Send break with transmitted data	Break sent with received data to the DTE
í \K5	Send break with transmitted data		Send break with transmitted data	Break sent with received data to the DTE

BUSY DETECT WATERMARK
Type:			Register
Format:			AT [cmds] SCn=x [cmds]
Description:			Sets the way the modem accepts a busy signal by FCC specifications
Command	Value			Function
SC0=x	30			Minimum BUSY ON Time
SC1=x		0			Minimum BUSY ON Time
SC2=x		75			Maximum BUSY ON Time
SC3=x		0			Maximum BUSY ON Time
SC4=x		30			Minimum BUSY OFF Time
SC5=x		0			Minimum BUSY OFF Time
SC6=x		75			Maximum BUSY OFF Time
SC7=x		0			Maximum BUSY OFF Time
Note: Each register "pair" holds the value for each setting. To set a value, divide the setting by 256. The integer goes in the second register, while the remained goes in the first. (A setting of 516 would convert to 2 Remainder 4, and could be set by sending ATSC0=4SC1=2 to the modem.) Settings are in 1/100ths of a second. Setting SC0=25 & SC4=25 allows FAST BUSY to also be detected as BUSY.

BUSY PULSES
Type:	Register
Format	AT [cmds] SC8=n [cmds]
Default:	4
Range:	Unidentified
Unit:	1 pulse
Description:	Set number of valid BUSY Pulses before reporting BUSY

CALLER ID
Type:	Configuration
Format:	AT [cmds] #CID=n [cmds]
Description:	Controls the Caller ID function
Command	Function
#CID?	Displays current Caller ID mode
#CID=?	Returns Caller ID modes supported
#CID=0	Caller ID disabled
#CID=1	Caller ID displays formatted data
#CID=2	Caller ID displays raw hexadecimal data

CARRIER CONTROL SELECTION
Type:	Configuration
Format:	AT [cmds] C1 [cmds]
Description:	Provided for backward compatibility only. Does nothing but return "OK"

COMMUNICATIONS MODE
Type:	Configuration
Format:	AT [cmds] &Mn [cmds]
Description:	Selects communications mode
Note: Same function as &Q(0-3) settings.
Command	Mode
í &M0	Asynchronous Direct mode
&M1	Asynchronous off-line command mode and synchronous connect mode.
&M2	Asynchronous off-line command mode - modem autodials first number in directory, then synchronous connect mode.
&M3	Asynchronous off-line command mode on low DTR, synchronous connect mode on high DTR.

COMMUNICATIONS MODE
Type:	Configuration
Format:	AT [cmds] &Qn [cmds]
Description:	Selects communications mode options
Command	Mode
í &Q0	Asynchronous Direct mode
&Q1	Asynchronous off-line command mode and synchronous connect mode.
&Q2	Asynchronous off-line command mode - modem autodials first number in directory, then synchronous connect mode.
&Q3	Asynchronous off-line command mode on low DTR, synchronous connect mode on high DTR.
&Q4	Not Used
í &Q5	Asynchronous Reliable Mode
&Q6	Asynchronous Normal Mode
&Q7	Not used
&Q8	Asynchronous Reliable Mode w/o v.42/v.42bis
&Q9	Asynchronous Reliable Mode w/o MNP 2-5
Note: Be VERY careful when issuing these commands! Once you enter &Q(1-3) and save it to memory, there are only two known ways to return to Asynchronous Mode: 1. Issue AT &Q(0,5-9) &W from a Synchronous Terminal to restore the modem to Asynchronous Mode. 2. Connect modem to an Asynchronous Terminal with the DTR signal (line 20) disabled (a "break-out" box works very nicely for this) and issue the configuration you want or AT &Q(0,5-9) &W to return the modem to Asynchronous Mode.

COMMUNICATION PROTOCOLS
Type:	Configuration
Format:	AT [cmds] Bn [cmds]
Description:	Selects the communication protocol for data calls
Note: The B command allows the simultaneous selection of more than one suffix, enabling multiple protocols.
Command		Function
B0		V.21 (1200bps) and/or V.22 (1200 bps)
B1		Bell 103 (300 bps)Band/or Bell 212A (1200 bps)
B15		V.21 (300 bps) only
B16		Bell 103 (300 bps) only

COMPRESSION
Type:	Configuration
Format:	AT [cmds] %Cn [cmds]
Description:	Selects data compression
Command	Function
%C0	Data compression disabled
%C1	MNP5 enabled
%C2	V.42bis enabled
%C3	MNP5 and V.42bis enabled

CONNECT MODE
Type:	Configuration
Format:	AT [cmds] \Nn [cmds]
Description:	Controls the type of connection the modem will operate in
Command	Function
\N0	Normal mode enabled
\N1	Direct mode enabled
\N2	MNP reliable mode enabled
í \N3	Auto-reliable mode enabled
Note: To force LAPM only connections use AT\N3S36=0

CONVERT TO MNP RELIABLE MODE
Type:	Immediate
Format:	AT [cmds] \Y [cmds]
Description:	Converts to MNP reliable mode from normal or direct mode

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, &Q8, &Q9		NONE	Command 2	Command 3	Command 4
&Q1		Command 0	Command 2	Command 3	Command 4
&Q2		Command 3	Command 3	Command 3	Command 3
&Q3		Command 3	Command 3	Command 3	Command 3
&Q4		Command 1	Command 2	Command 3	Command 4
Command	Function
Command 0	Modem does not respond to DTR
Command 1	Modem hangs-up and sends "OK" result code
Command 2	Modem goes to command mode after DTR goes is off
Command 3	Modem goes to command mode and disconnects (hangs up) after DTR goes off; Auto-Answer is 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
- ( ) i	These symbols and spaces are ignored
J	Do MNP 10 link negotiation at highest rate (this call only, see *H)
K	Enable power level adj. during MNP 10 link neg. (this call only, see Mn)
L	Dial the last dialing string (limitted to the first 40 characters).
P	Pulse dial the following digits
R	Dial with answer rather than originate carrier. (Some models accept, but do not support, this command.) Normal Mode: Calling Side: ATDTn Answering Side: ATA Reverse Mode: Calling Side: ATDTnR Answering Side: ATXD
Sn	Dial stored in non-volitile memory location n. n=0-3
T	Tone dial enabled
W	Wait for second dialtone
*	DTMF code for "star"
#	DTMF code for "gate"
@	Wait for quiet answer, a 5 second silence.
,	Pause before finishing dial string, time set in S8.
!	Hook flash, go on-hook for time set in S29.
^	Enabled 1300Hz call originating pulse
;	Return to command state after dialing
>	Generate a grounding pulse on the EARTH relay output. If country code setting supports it.

DISPLAY STORED NUMBER
Type:	Immediate
Format:	AT [cmds] \F [cmds]
Description:	Display telephone directory stored in non-volatile memory

DTR CHANGE THRESHOLD
Type:	Register
Format	AT [cmds] S25=n [cmds]
Default:	5
Range:	0-255
Unit:	.01 second
Description:	Sets maximum time a change in the DTR signal will be ignored

ECHO DATA
Type:	Configuration
Format:	AT [cmds] \En [cmds]
Description:	Enables modem to echo received data
Note: Accepted, but not functional on some models
Command	Function
\E1	One shot that minimizes local echo to try to match local network

ECHOPLEX VALIDITY
Type:	Configuration
Format:	AT [cmds] Fn [cmds]
Description:	Selects whether commands sent while in data mode are echoed
Note: This command is only supported on older modems.
Command	Function
F0	Not Supported (Returns "ERROR")
í F1	Provided for backward compatibility only. (Returns "OK")

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		No flow control, No error correction, No data compression
&F1		MAC hardware flow control, correction & compression active
&F2		Hardware flow control, correction & compression active

FLASH DIAL MODIFIER TIME
Type:	Register
Format	AT [cmds] S29=n [cmds]
Default:	7
Range:	0-255
Unit:	.1 second
Description:	Time the modem will go on-hook upon receiving the ! dial modifier in dial string.

FLOW CONTROL
Type:	Configuration
Format:	AT [cmds] \Gn [cmds]
Description:	Selects modem port flow control for Normal and Direct modes
Command	Function
í \G0	Flow control disabled
\G1	Flow control enabled

FLOW CONTROL CHARACTER - XON
Type:	Register
Format:	AT [cmds] S32=n [cmds]
Default:	17
Range:	0-255
Unit:	ASCII
Description:	Sets the character used to represent XON

FLOW CONTROL CHARACTER - XOFF
Type:	Register
Format:	AT [cmds] S33=n [cmds]
Default:	19
Range:	0-255
Unit:	ASCII
Description:	Sets the character used to represent XOFF

INACTIVITY TIMER
Type:	Configuration
Format:	AT [cmds] \Tn [cmds]
Default:	0
Range:	0-42
Unit:	1 second
Description:	Sets the length of time that the modem does not receive information before it disconnects. \T=0 will disable timer

INACTIVITY TIMER
Type:	Register
Format	AT [cmds] S30=n [cmds]
Default:	0
Range:	0-255
Unit:	10 seconds
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. In Reliable mode any data transfer resets timer. In Normal mode only sent data resets timer.

INITIATE MNP RELIABLE MODE
Type:	Immediate
Format:	AT [cmds] \O [cmds]
Description:	Initiates MNP reliable mode from normal or direct mode

LINE SELECT MODULATION
Type:	Configuration
Format:	AT [cmds] Fn [cmds]
Description:	Selects the speed/protocol the modem will operate in
Note: Use either ATFn or a combination of ATS37=n and ATN0, but DO NOT try to USE BOTH at the same time.
Command		Function
F0		AutoMode Selection (try rates in order from fast to slow).
F1		300 bps only (protocol according to Bn setting)
F2		Not Used (return "OK")
F3		v.23 only 75TX/1200RX (originate) or 1200TX/75RX (answer)
F4		1200 bps only (protocol according to Bn setting)
F5		2400 bps only (v.22bis)
F6		4800 bps only (v.32/v.32bis)
F7		7200 bps only (v.32bis)
F8		9600 bps only (v.32/v.32bis)
F9		12000 bps only (v.32bis)
F10		14400 bps only (v.32bis)

LINE SIGNAL LEVEL
Type:	Immediate
Format	AT [cmds] %L [cmds]
Default:	Unidnetified
Range:	9-43
Unit:	-dBm
Description:	Returns a value which indicates the received line signal level

LINE SIGNAL QUALITY
Type:	Immediate
Format	AT [cmds] %Q [cmds]
Default:	Unidentified
Range:	0-127
Unit:	Unidentified
Description:	Returns a value which indicates line signal quality

LOCK SERIAL PORT
Type:	Configuration
Format:	AT [cmds] \Jn [cmds]
Description:	Sets operation of serial port speed
Command	Function
\J0	Serial speed locked
\J1	Serial speed follows connect speed

MAXIMUM BLOCK SIZE FOR TRANSMISSION
Type:	Configuration
Format:	AT [cmds] \An [cmds]
Description:	Sets the maximum transmittable block size
Command	Function
\A0	MNP block size is 64 characters
\A1	MNP block size is 128 characters
í \A2	MNP block size is 192 characters
\A3	MNP block size is 256 characters

MNP - EXTENDED SERVICES
Type:	Configuration
Format:	AT [cmds] -Kn [cmds]
Description:	Selects MNP extended services (MNP10)
Command	Function
-K0	V.42 LAPM to MNP 10 connection disabled
-K1	V.42 LAPM to MNP 10 connection enabled

MNP - STREAM/BLOCK MODE
Type:	Configuration
Format:	AT [cmds] \Ln [cmds]
Description:	Selects the transfer mode for MNP link
Command	Function
í \L0	Stream mode for MNP enabled
\L1	Block mode for MNP enabled

MNP10 - FALLBACK
Type:	Configuration
Format:	AT [cmds] -Qn [cmds]
Description:	Allows MNP10 to fall back to speeds slower than 4800bps

MNP10 - LINK NEGOTIATION
Type:	Configuration
Format:	AT [cmds] *Hn [cmds]
Description:	Sets the speed at which MNP10 link negotiation will occur
Command	Function
í *H0	Link will be negotiated at highest possible speed
*H1	Link will be negotiated at 1200bps
*H2	Link will be negotiated at 4800bps

MNP10 - POWER LEVEL ADJUST
Type:	Configuration
Format:	AT [cmds] )Mn [cmds]
Description:	Controls automatic transmit power level adjustment during MNP 10 link negotiation
Command	Function
í )M0	Power level adjustment disabled
)M1	Power level adjustment enabled

REPORT INFORMATION
Type:	Immediate
Format:	AT [cmds] In [cmds]
Description:	Displays requested information
Command		Function
I0		SupraFAXModem product ID code
I1		ROM checksum
I2		Test Checksum (OK if correct, ERROR if not)
I3		ROM revision code
I4		Encrypted report of supported protocols
I5		Supra Copyright information
I10		Supported Features
I99		Electronic Serial Number

RESULT CODES
Type:	Configuration
Format:	AT [cmds] Qn [cmds]
Description:	Enables modem to send result codes to the DTE
Command	Function
í Q0	Result code sending enabled
Q1	Result code sending disabled
Q2	Enable result code sending when Originating, disable when answering

RTS TO CTS DELAY
Type:	Register
Format	AT [cmds] S26=n [cmds]
Default:	1
Range:	0-255
Unit:	.01 second
Description:	Sets the duration of delay for CTS to respond to RTS status change (sync mode only)

SELECT CALL PROGRESS RESULT CODES
Type:	Configuration
Format:	AT [cmds] Xn [cmds]
Description:	Enables selection of tone detection and associated result code format options
Command	Function
X0	Basic result codes only enabled
X1	Basic and connection speed result codes enabled
X2	Basic and connection speed result codes and dialtone detection enabled
X3	All result codes except dialtone detection enabled
í X4	All result codes enabled

SLEEP TIMER
Type:	Register
Format	AT [cmds] S24=n [cmds]
Default:	0
Range:	0-255
Unit:	1 second
Description:	Maximum duration of DTE and DCE inactivity allowed prior to initiating low-power sleep mode.

STATUS-REGISTER
Type:	Configuration
Format:	AT [cmds] (see below) [cmds]
Description:	Gives options to read or write to a specified register
Command		Function
=n		Write value n to the last S register viewed
?		Displays current setting for the last S register accessed
Sr?		Reports value in S register r
SCr?		Reports value is SC register r
Sr=n		Write value n into S register r
SCr=n		Write value n into SC register r

SWITCH TO NORMAL MODE
Type:	Immediate
Format:	AT [cmds] \Z [cmds]
Description:	Switches to normal mode from MNP mode

TEST MODES
Type:		Register
Format:		AT [cmds] S16=n [cmds]
Default:		0
Range:		0-125
Unit:		Bit-mapped
Description:		Controls loopback tests, analog, digital, remote digital, and self tests.
Bit	Value	Function
0	í 0 1	Local analog loopback not in progress Local analog loopback in progress
1	í 0	Not used
2	í 0 1	Local digital loopback not in progress Local digital loopback in progress
3	í 0 1	Modem not in remote digital loopback Remote digital loopback in progress
4	í 0 1	Remote digital loopback not requested Remote digital loopback requested
5	í 0 1	Remote digital loopback w/ self-test not in progress Remote digital loopback w/ self-test in progress
6	í 0 1	Local analog loopback w/ self-test not in progress Local analog loopback w/ self-test in progress

TRANSMISSION LEVEL - CELLULAR
Type:	Configuration
Format:	AT [cmds] @Mn [cmds]
Default:	Unidentified
Range:	0-1
Unit:	Unidentified
Description:	Sets the signal level for transmission while in cellular mode (MNP10)

V.23 MODE
Type:	Configuration
Format:	AT [cmds] %Fn [cmds]
Description:	Selects V.23 split-speed and half-duplex
Command		Function
%F1		75bps transmit, 1200bps receive (split-speed)
%F2		1200bps transmit, 75bps receive (split-speed)
%F3		1200bps transmit, 1200bps receive (half-duplex)

V.23 - SPLIT-SPEED
Type:	Configuration
Format:	AT [cmds] \Wn [cmds]
Description:	Controls V.23 split-speed mode
Command	Function
í \W0	V.23 split-speed mode disabled
\W1	V.23 split-speed mode enabled

V.42bis - CLEAR DICTIONARY
Type:	Immediate
Format:	AT [cmds] %P [cmds]
Description:	Clears both modems' V.42bis dictionaries

V.42bis - COMPRESSION CONTROL
Type:	Configuration
Format:	AT [cmds] %Mn [cmds]
Description:	Controls V.42bis data compression
Note: Function varies by model
Command	Function
%M0	V.42bis disabled
%M1	V.42bis when transmitting enabled
%M2	V.42bis when receiving enabled
í %M3	V.42bis when transmitting/receiving enabled

V.42bis - DICTIONARY SIZE
Type:	Configuration
Format:	AT [cmds] %Dn [cmds]
Description:	Select V.42 dictionary size
Command	Function
%D0	Select 512 bytes
%D1	Select 1024 bytes
í %D2	Select 2048 bytes
%D3	Select 4096 bytes on one-way compression; 2048 bytes on two-way compression

V.42bis - MAXIMUM STRING LENGTH
Type:	Immediate
Format:	AT [cmds] %Sn [cmds]
Default:	32
Range:	6-250
Unit:	Characters
Description:	Selects string size for V.42bis compression