Card Type	Modem, fax
Chip Set	Unidentified
I/O Options	Microphone, speaker out,
Maximum Modem Rate	28.8Kbps
Maximum Fax Rate	14.4Kbps
Data Modulation Protocol	Unidentified
Fax Modulation Protocol	Unidentified
Error Correction/Compression	MNP5, V.42, V.42bis
Fax Class	Unidentified
Data Bus	External

CONNECTIONS
Function	Label		Function		Label
Serial port		CN1		Line in		CN4
Microphone		CN2		Line out		CN5
Speaker out		CN3		Power switch		SW1

DIAGNOSTIC LED(S)
LED	Color	Status	Condition
AA	Unidentified	On	Auto-answer enabled
AA	Unidentified	Off	Auto-answer disabled
RXD	Unidentified	On	Modem is receiving data
RXD	Unidentified	Off	Modem is not receiving data
TDX	Unidentified	On	Modem is transmitting data
TDX	Unidentified	Off	Modem is not transmitting data
CD	Unidentified	On	Carrier signal detected
CD	Unidentified	Off	Carrier signal not detected
V34	Unidentified	On	Modem connected at V34
V34	Unidentified	Off	Modem not connected at V34
V32B	Unidentified	On	Modem connected at V32bis
V32B	Unidentified	Off	Modem not connected at V32bis
OH	Unidentified	On	Modem is off-hook
OH	Unidentified	Off	Modem is on-hook
EC	Unidentified	On	Error correction enabled
EC	Unidentified	Off	Error correction disabled
SQ	Blinking	Off	Failed self test

SUPPORTED COMMAND SET

Basic AT Commands

AT, ‘+++’, A/

A, B, E, M, O, T, V

&C, &F, &J, &M, &R, &T, &X, &Z

S Registers

S0, S1, S2, S3, S4, S5, S6, S7, S8, S9, S10, S11, S16, S18

BREAK HANDLING
Type:	Configuration
Format:	AT [cmds] &Yn [cmds]
Description:	Break handling
Command	Function
í &Y0	Break sent to remote modem immediately
&Y1	Break sent to remote modem and buffer cleared
&Y2	Send break with transmitted data

CONFIGURATION PROFILES
Type:	Immediate
Format:	AT [cmds] &Vn [cmds]
Description:	Displays active and stored configuration profiles
Command	Function
&V0	View current active settings
&V1	View user profile 1
&V2	View user profile 2
&V3	View user profile 3
&V4	View user profile 4
&V5	View factory default settings

DATA RATE
Type:	Configuration
Format:	AT [cmds] &Bn [cmds]
Description:	Controls the DTE rate
Command	Function
í &B0	Serial speed follows connect speed
&B1	Serial speed locked

DATA SET READY (DSR)
Type:	Configuration
Format:	AT [cmds] &Sn [cmds]
Description:	Selects DSR options
Command	Function
í &S0	DSR forced high
&S1	DSR according to CCITT (ITU-TSS)

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
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

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
DP	Pulse dialing enabled
DR	Answer mode enabled; originate mode disabled following handshake initiation.
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 Quite 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.
DL	Repeat last ATD command
D;	Modem returned to idle state after dialing. The semicolon can only be placed at the end of the dial command.

DOWNLOAD FIRMWARE
Type:	Configuration
Format:	AT [cmds] UPX [cmds]
Description:	Download firmware to the Flash EPROM using Xmodem protocol

ERROR CONTROL
Type:	Configuration
Format:	AT [cmds] &Kn [cmds]
Description:	Enables error control options
Command	Function
&K0	Error control disabled
&K1	Error control enabled
&K2	MNP4 and MNP5 error control enabled
í &K3	V.42 and MNP4 error control enabled
&K4	V.42 and V.42bis error control enabled

GUARD TONE
Type:	Configuration
Format:	AT [cmds] &Gn [cmds]
Description:	Commands the modem to transmit a guard tone in V.22/V.22bis
Note: Used primarily for international data transmission
Command	Function
í &G0	Guard tone disabled
&G2	1800Hz guard tone enabled

HELP
Type:	Immediate
Format:	AT [cmds] $ [cmds]
Description:	Display help screen
Command	Function
$	Basic command summary
&$	Extended command summary
*$	Extended command summary

LINE TYPE
Type:	Configuration
Format:	AT [cmds] &Ln [cmds]
Description:	Selects line type
Command	Line Type
í &L0	Switched line (PSTN/Dial-up)
&L1	2W leased-line
&L2	4W leased-line

RE-EXECUTE
Type:	Immediate
Format:	A> <CR>
Description:	Re-executes the last command once or the last call up to 9 times.
Note: Do not precede this command with AT. This version of the escape sequence is used in non-Hayes modems.

REPORT INFORMATION
Type:	Immediate
Format:	AT [cmds] In [cmds]
Description:	Displays information requested
Command	Function
I0	Reports modem model and speed
I1	Reports ROM checksum
I2	Report modem link status
I12	Report physical layer status

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	Modem returns result code but quiet after answering on a RING

RING VOLUME
Type:	Configuration
Format:	AT [cmds] Nn [cmds]
Default:	5
Range:	0-7
Description:	Ring volume control. ‘NO’ will disable the audio ring function

MODEM LINK MODE
Type:	Configuration
Format:	AT [cmds] &Nn [cmds]
Description:	Modem link mode options
Command	Mode
í &N0	Multi-Auto, auto negotiate highest possible link rate
&N1	V.33 14400/12000
&N2	V.33 12000
&N3	V.32 9600T/9600/7200T/4800
&N4	V.32 9600/7200/4800
&N5	V.32 4800
&N12	V.23 1200/75
&N13	V.23 600/75
&N14	V.22bis 2400/1200
&N15	V.22 1200
&N16	V.21 300
&N17	V.32bis 14400/12000/9600/7200/4800
&N18	V.32bis 12000/9600/7200/4800
&N19	V.32bis 7200/4800
&N24	BELL 212A 1200
&N25	BELL 103 300
&N32	G3 Fax V.17/V.29/V.27ter 14400/12000/9600/7200/4800/2400
&N34	ZyXEL 19200
&N35	ZyXEL 16800
&N36	ZyXEL 14400
&N37	ZyXEL 12000
&N38	ZyXEL 9600
&N39	ZyXEL 7200
&N42	CELL 14400
&N43	CELL 12000
&N44	CELL 9600
&N45	CELL 7200
&N46	CELL 4800T
&N62	V.34 28800
&N63	V.34 26400
&N64	V.34 24000
&N65	V.34 21600
&N66	V.34 19200
&N67	V.34 16800
&N68	V.34 14400
&N69	V.34 12000
&N70	V.34 9600
&N71	V.34 7200
&N72	V.34 4800
&N73	V.34 2400

PULSE DIALING RATIO
Type:	Configuration
Format:	AT [cmds] &Pn [cmds]
Description:	Selects pulse dial make/break ratio
Command	Function
í &P0	39/61ms at 10pps (North America)
&P1	33/67ms at 10pps (Europe)

SELECT CALL PROGRESS RESULT CODES
Type:	Immediate
Format:	AT [cmds] Xn [cmds]
Description:	Enables selection of tone detection and associated result code format options
Command	Function
X0	Busy and dial tone detection disabled; result codes 0 - 4 enabled.
X1	Busy and dial tone detection disabled; result codes 0 - 5 & 10 enabled.
X2	Busy tone detection disabled, dial tone detection enabled; result codes 0 - 6 & 10 enabled.
X3	Busy tone detection enabled, dial tone detection disabled; result codes 0 - 5, 7 & 10 enabled.
X4	Busy and dial tone detection enabled; result codes 0 - 7 & 10 enabled.
X5	Busy and dial tone detection enabled: result codes 0 - 7 & 10 enabled. Reports DTE speed, all CARRIER & PROTOCOL extended result codes enabled
X6	Busy and dial tone detection enabled; result codes 0 - 7 & 10 enabled. Reports DCE speed, all extended result codes disabled
X7	Busy and dial tone detection enabled; result codes 0 - 7 & 10 enabled. Reports DCE speed, all CARRIER & PROTOCOL extended result codes enabled

SOFT RESET
Type:	Immediate
Format:	AT [cmds] Zn [cmds]
Description:	Restores modem profiles previously saved in non-volatile RAM using the &W command.
Command	Function
Z0	Restore setting 0
Z1	Restore setting 1
Z2	Restore setting 2
Z3	Restore setting 3
Z4	Restore factory settings

SPEAKER VOLUME
Type:	Configuration
Format:	AT [cmds] Ln [cmds]
Default:	4
Range:	0-7
Description:	Controls speaker volume

STORE ACTIVE PROFILE
Type:	Configuration
Format:	AT [cmds] &Wn [cmds]
Description:	Writes the values for the user profile n into the non-volatile RAM

TERMINATE CONNECTION
Type:	Immediate
Format:	<any key> <CR>
Description:	Terminate current connection attempt when enter in handshaking state.
Note: Do not precede this command with AT. This version of the escape sequence is used in non-Hayes modems.

AUTO HANDSHAKE MODE
Type:	Configuration
Format:	AT [cmds] *Mn [cmds]
Description:	Leased line auto-handshake mode selection
Command	Function
*M0	Set to Originate mode
*M1	Set to Answer mode

CALLER ID
Type:	Configuration
Format:	AT [cmds] *T [cmds]
Description:	Recall the last CND (Caller ID) information

CHARACTER LENGTH
Type:	Configuration
Format:	AT [cmds] *Cn [cmds]
Description:	Controls the character length, including start, stop and parity bit
Command	Function
*C0	10-bit character length
*C1	11-bit character length
*C2	9-bit character length
*C3	8-bit character length

COMMAND SET
Type:	Configuration
Format:	AT [cmds] *In [cmds]
Description:	Command set selection
Command	Function
*I0	AT command set
*I1	V.25bis command set
*I2	Dumb mode

CONFIGURATION PROFILE
Type:	Configuration
Format:	AT [cmds] *Wab [cmds]
Description:	Write local configuration profile a to remote user profile b and reset modem from profile b
Command	Function
a=0	Assign local user profile 0 to "a"
a=1	Assign local user profile 1 to "a"
a=2	Assign local user profile 2 to "a"
a=3	Assign local user profile 3 to "a"
b=0	Assign local user profile 0 to "b"
b=0	Assign local user profile 1 to "b"
b=0	Assign local user profile 2 to "b"
b=0	Assign local user profile 3 to "b"
a=4	Local active configuration
a=5	Local factory default configuration

DEFAULT DIAL POINTER
Type:	Configuration
Format:	AT [cmds] *Dn [cmds]
Range:	0-49
Description:	Set default dial pointer at telephone directory location n

LINE QUALITY
Type:	Configuration
Format:	AT [cmds] *Qn [cmds]
Description:	Action taken when line quality changes
Command	Function
*Q0	No action to poor signal quality
*Q1	Retrain action taken in signal quality is poor
*Q2	Adaptive rate, automatic fall-back or forward
*Q3	Disconnect if signal quality is poor

MODEM ERROR CONTROL NEGOTIATION
Type:	Configuration
Format:	AT [cmds] *En [cmds]
Description:	Modem error control negotiation
Command	Function
*E0	If error control negotiation fails, keep the non-error control connection
*E1	If error control negotiation fails, disconnect the call (hang-up)

PASSWORD TABLE
Type:	Immediate
Format:	AT [cmds] *V [cmds]
Description:	View the Password table

REMOTE CONFIGURATION
Type:	Configuration
Format:	AT [cmds] *Fn [cmds]
Description:	Remoter configuration enable
Command	Function
*F0	Deny remote configuration
*F1	Accept remote configuration

REMOTE PROFILE
Type:	Configuration
Format:	AT [cmds] *Rab [cmds]
Description:	Read the remote profile "b" to local user profile "a"
Options	Function
a=0	Assign local user profile 0 to "a"
a=1	Assign local user profile 1 to "a"
a=2	Assign local user profile 2 to "a"
a=3	Assign local user profile 3 to "a"
b=0	Assign local user profile 0 to "b"
b=0	Assign local user profile 1 to "b"
b=0	Assign local user profile 2 to "b"
b=0	Assign local user profile 3 to "b"
b=4	Remote active configuration
b=5	Remote factory default configuration

SECURITY FUNCTION
Type:	Configuration
Format:	AT [cmds] *Gn [cmds]
Description:	Security function selection
Command	Function
*G0	Disable security functions
*G1	Enable type 1 security, with password check
*G2	Enable type 1 security, with password check and call back
*G3	Enable type 2 security, with password check
*G4	Enable type 2 security, with password check and call back
*G5	Enable type 2 security, with password check and call back, remote user enters the call back number.

SUPERVISOR PASSWORD
Type:	Configuration
Format:	AT [cmds] *HS [cmds]
Description:	Modify supervisory password (default: "ZyXEL")

TRANSMISSION POWER LEVEL
Type:	Configuration
Format:	AT [cmds] *Pn [cmds]
Default:	9
Range:	0-15
Description:	Set leased line transmission power level

USER PASSWORD
Type:	Configuration
Format:	AT [cmds] *Hn [cmds]
Range:	0-49
Description:	Modify user password table at location n

BIT-MAPPED REGISTER S13
Format:	AT [cmds] S13=n [cmds]
Default:	170
Unit:	Bit-mapped
Description:	Capture modem information

BIT-MAPPED REGISTER S14
Format:		AT [cmds] S14=n [cmds]
Default:		170
Unit:		Bit-mapped
Description:		Controls auto-handshake
Bit	Value	Function
0	í 0 1	Modem auto-handshake on Originate mode Modem auto-handshake on Answer mode
1	0 í 1	Grant remote Digital Loop-back test request Deny remote Digital Loop-back test request
3,2	í 0 1 8	Dial-up line 2-wire leased line 4-wire leased line
5,4	í 0 16 32	Internal clock External clock Remote clock
7,6	í 0 64 128 192	Asynchronous data with buffering Asynchronous command, synchronous data Direct asynchronous, no data buffering Synchronous

BIT_MAPPED REGISTER S15
Type:		Register
Format:		AT [cmds] S15=n [cmds]
Description:		Controls parity
Bit	Value	Function
0,1	í 0 1 2	Even parity Odd parity No parity
2	í 0 4	1 stop bit 2 stop bits
4,3	í 0 8 16 24	10 bit character length 11 bit character length 9 bit character length 8 bit character length
7-5	í 0 32 64 96 128	Profile 0 as active settings after power on Profile 1 as active settings after power on Profile 2 as active settings after power on Profile 3 as active settings after power on Factory default as active settings after power on

BIT-MAPPED REGISTER S17
Type:		Register
Format:		AT [cmds] S17=n [cmds]
Unit:		Bit-mapped
Description:		Controls dialing
Bit	Value	Function
0	0	Disable secondary channel
4-1	í 0-30	Set leased line transmit power level from 0 to 15 dBn.
5	í 0 32	Normal dial Reverse dial, go on-line in answer mode
7,6	í 0 64 128	AT command set V.25bis command set Dumb mode

BAUD RATE
Type:		Register
Format		AT [cmds] S18=n [cmds]
Description:		Force modem to fix baud rate when answering
Bit	Value	Function
0	0	Disable fixed baud rate
1-46	1-2E	Enable baud rate to be fixed when answering. Baud rate value settings (n) the same as S20

MODEM CONNECTION MODE
Type:		Register
Format		AT [cmds] S19=n [cmds]
Description:		MODEM CONNECTION MODE
Note: S18=0 disables the timer and allows an indefinite duration.
Value	Function
0-73	Setting value as ‘AT&Nn’ command

BIT-MAPPED REGISTER S20
Format	AT [cmds] S20=n [cmds]
Default:	Unidentified
Unit:	Bit-mapped
Description:	DTE speed (bps). Auto detect from AT Command
Value	Function
S20=0	230400bps
S20=1	115200bps
S20=2	76800bps
S20=3	57600bps
S20=4	38400bps
S20=5	19200bps
S20=6	16800bps
S20=7	14400bps
S20=8	12000bps
S20=9	9600bps
S20=10	7200bps
S20=11	4800bps
S20=12	2400bps
S20=13	1200bps
S20=14	460800bps
S20=15	300bps
S20=16	307200bps
S20=17	153600bps
S20=18	102400bps
S20=20	61440bps
S20=21	51200bps
S20=22	62400bps
S20=24	124800bps
S20=25	62400bps
S20=26	41600bps
S20=27	31200bps
S20=28	24960bps
S20=29	20800bps
S20=46	92160bps

BIT-MAPPED REGISTER S21
Format		AT [cmds] S21=n [cmds]
Default:		Unidentified
Unit:		Bit-mapped
Description:		Auto speed detection
Bit	Value	Function
0	0 1	Maintain non-error control connection when modem error control handshake fails Drop connection when modem error control handshake fails
1-2	0 2 4 6	Speaker always off Speaker on until carrier is detected Speaker always on Speaker on after last digit is dialed out until carrier is detected
3	0 8	DSR always on According to CCITT
4	0 16	CD always on CD tracks presence of data carrier
5	0	CTS follows RTS in synchronous mode. Response delay set in S26.
	32	Ignore RTS (CTS always on) in synchronous mode.
6-7	0 64 128 192	Assume DTR always on 108.1 DTR off-on transition causes dial of the default number 108.2 Data Terminal Ready. DTR off causes the modem to hang up and return to command mode 108.2 DTR off causes the modem to hang up and reset the modem to profile #0 after DTR dropped

BIT-MAPPED REGISTER S23
Format		AT [cmds] S23=n [cmds]
Default:		Unidentified
Unit:		Bit-mapped
Description:		Bit mapped register
Bit	Value	Function
0	0 1	Command echo disabled Command echo enabled
1	0 2	Tone dial Tone dial
2	0 4	Pulse dial make/break ratio = 39% / 61% Pulse dial make/break ratio = 33% / 67%
3-5	0 8 16 24 32 40 48 56	ATX0 ATX1 ATX2 ATX3 ATX4 ATX5 ATX5, error control result code enabled ATX6, error control result code enabled
6	0 64	Display result code in verbose format (see S35.7) Display result code in verbose format
7	0 128	Modem returns result state Modem does not return result code

BIT MAPPED REGISTER S24
Type:		Register
Format		AT [cmds] S24=n [cmds]
Default:		Unidentified
Unit:		Unidentified
Description:		Bit mapped register
Bit	Value	Function
2-0	0-7	Ring volume control
6-4	16-112	Speaker volume control

DTR TIME DELAY
Type:	Register
Format	AT [cmds] S25=n [cmds]
Default:	0
Range:	Unidentified
Unit:	.1 second
Description:	Specify the time delay that DTR signal needs to be off before it will be recognizedIf S25=0, the delay time is set to 4ms.

RTS/CTS DELAY
Type:	Register
Format	AT [cmds] S26=n [cmds]
Default:	0
Range:	0 - 255
Unit:	.1 second
Description:	Set the delay, in 10ms units between the RTS and modem’s CTS response in synchronous mode.

BIT-MAPPED REGISTER S27
Format			AT [cmds] S27=n [cmds]
Default:			Unidentified
Unit:			Bit-mapped
Description:			Bit mapped register
Bit	Value		Function
0-2	0 1 2 3 4	No error control MNP4 and MNP3 error control MNP4 and MNP5 error control V.42 and MNP4 error control V.42 and V.42bis error control
3-5	0 24 32 40		Flow control disabled Hardware (RTS/CTS) flow control Software (XON/XOFF) flow control Reserved
6-7	0 64 128 192		No response to poor signal quality Retrain action taken if signal quality *Q1 is poor Adaptive rate (auto fall back/forward) when signal quality changes Disconnect when signal quality is poor

BIT-MAPPED REGISTER S28
Format		AT [cmds] S28=n [cmds]
Default:		unidentified
Unit:		Bit-mapped
Description:		Bit mapped register
Bit	Value	Function
0	0 1	Reserved Multiple phone/modem line
1	0 1	Panel key is normal Panel key is locked
2-3	0 1 10	Destructive, expedited break Non-destructive expedited break Non-destructive, un-expedited break
4-5	0 16 32	No guard tone Reserved 1800Hz guard tone
6	0 1	DTE/DCE rate follows link rate DTE/DCE rate is fixed at the DTE setting
7	0 128	Select V.22 for 1200bps communications Select Bell 212A for 1200bps communication

PHONE NUMBER POINTER
Type:	Register
Format	AT [cmds] S29=n [cmds]
Default:	0
Range:	0-49
Description:	Set default dial phone number pointer, use AT&Zn=s to store phone numbers

XON VALUE
Type:	Register
Format	AT [cmds] S31=n [cmds]
Default:	0
Range:	0-255
Description:	Holds the ASCII decimal value of the XON

XOFF VALUE
Type:	Register
Format:	AT [cmds] S32=n [cmds]
Default:	0
Range:	0-255
Description:	Holds the ASCII decimal value of the XOFF

BIT MAPPED REGISTER S35
Type:		Register
Format:		AT [cmds] S35=n [cmds]
Description:		Bit mapped register
Bit	Value	Function
0	1	Use CELL 4800T trellis coded 4800 for V.32 4800 (available with cellular mode only)
1	2	Disable aborting from terminal during modem handshaking
2	4	V.26 alternative A.
3	8	Add 12dBm attenuation to the leased line
4	16	When Data/Voice with is pressed, modem will dial the default number
5	32	Enable Selective Reject in V.42
6	64	Enable password protection to profile saving. When ‘AT&W0’ is issued, and profile 0 in the NVRAM has this bit set, the supervisory password will be requested. This bit in profile 0 also protects the supervisory password from a hardware reset.
7	128	Enable extended numerical result codes from 50-71 when an error corrected connection is made. Use with ATV0.

BIT MAPPED REGISTER
Type:		Register
Format		AT [cmds] S36=n [cmds]
Description:		Bit mapped register
Bit	Value	Function
0	0 1	Deny remote request for configuration Grant remote request for configuration
1	0 2	Write from local profile to remote profile Read from local profile to remote profile
7-5	0 32 64 96 128 160	Disable security function Enable type 1 security with password check Enable type 1 security with password check and call-back (ZyXEL to ZyXEL only) Enable type 2 security with password check Enable type 2 security with password check and call-back Enable type 2 security with password check and call-back, remote site enters the call-back number

BIT MAPPED REGISTER S37
Type:		Register
Format		AT [cmds] S37=n [cmds]
Description:		Bit mapped register for remote configuration using panel menu control
Bit	Value	Function
3-0	0-5	Remote profile number
7-4	0-80	Local profile number

BIT MAPPED REGISTER S38
Type:		Register
Format		AT [cmds] S38=n [cmds]
Description:		Bit mapped register
Bit	Value	Function
0	1	Repeatedly dialing default number
3	8	DCD ON/OFF sequence follows UNIX standard, DCD high before connect message is sent, DCD off after last DCE response is sent.
4	16	Auto-mode fax receiving disabled
5	32	Disable MNP5

BIT MAPPED RIGESTER S39
Type:		Register
Format		AT [cmds] S39=n [cmds]
Description:		Bit mapped register
Bit	Value	Function
2	4	Answer in originating mode
3	8	Class 2 Fax Bitfax compatibility: +FCON at 2400 next phase at 19200
4	16	Class 2 Fax mode DTE shifting: +FCON at current DTE, shift to 19,200 when entering into the next phase
5	32	Disable scrambler/descrambler in V.26bis mode.

BIT-MAPPED REGISTER S40
Format		AT [cmds] S40=n [cmds]
Default:		Unidentified
Unit:		Bit-mapped
Description:		Bit mapped register
Bit	Value	Function
1	2	No result code displayed in answer mode
2	4	Enables caller ID detection
3	8	Enables type 1 ring detection
4	16	Enables type 2 ring detection
5	32	Enables type 3 ring detection
6	64	Enables type 4 ring detection

BIT-MAPPED REGISTER S41
Format		AT [cmds] S41=n [cmds]
Default:		Unidentified
Unit:		Bit-mapped
Description:		Bit mapped register
Bit	Value	Function
0	1	Special MNP compatibility.
2	4	Disable retrain abort, up to 5 min. for special satellite line condition
3	8	Enable CCITT signals 140 and 141 on EIA232D interface
4	16	In X2-X7 setting, modem waits for S6 seconds before dialing and ignors dial tone detection
5	32	DSR follows DCD and pulses
6	64	Force S0>=2
7	128	Ignore calling tone, not to be used as fax detection

BIT MAPPED REGISTER S42
Type:				Register
Format:		AT [cmds] S42=n [cmds]
Description:		Bit mapped register
Bit	Value		Function
1	2		Enable throughput averaging
2	4		CND message will be forced on even if AT02 is set
3	8		Disable escape sequence code in answer mode
4	16		Disable V.17, 14,400 fax in calling made, no effect to answering mode &N32
5	32		Disable Data/Voice button
6	64		Disable ‘RINGING’ result code
7	128		DCD forced on but pulse off for 0.5 seconds at carrier loss

BIT MAPPED REGISTER S43
Type:				Register
Format:		AT [cmds] S43=n [cmds]
Description:		Bit mapped register
Bit	Value		Function
0	1		Disable ZyXEL 16800 in Multi-Auto mode
1	2		Disable ZyXEL 19200 in Multi-Auto mode
2	4		Disable cellular mode automatic transmit power adjustment
3	0		Enable cellular mode in Multi-Auto mode
	8		Disable cellular mode in Multi-Auto mode
6	64		Enable 1.5sec., p[ause between off-hook and modem answering
7	128		Modem hang-up if the line condition does not permit modem to run highest speed set by ‘&Nn’ command

BIT MAPPED REGISTER S44
Type:				Register
Format:		AT [cmds] S44=n [cmds]
Description:		Bit mapped register
Bit	Value		Function
3	8		ATDSn initiates auto-dial of the stored numbers consecutively until connection is made
4	16		DSR follows DTR
5	32		Enable V.13 half-duplex simulation in synchronous mode
6	64		When selected with ‘&Bo’. DTE speed fixed at 38400 when the link speed is above 9600. DTE speed fixed at 9600 if link speed is 7200, DTE speed follows link speed. When selected with &B1, DTE speed fixed at current rate when an ARQ connection is made, when a non-ARQ connection is made, DTE speed follows the link speed. (see also S18)
7	128		Enable UK type short-to-short ring-back detection.

CND SILENCE
Type:		Register
Format:	AT [cmds] S45=n [cmds]
Range:	0-255
Units:	20ms
Description:	Delay during which the CND silence detection is disabled