Card Type	Modem (asynchronous)
Chip Set	Unidentified
Maximum Modem Rate	33.6Kbps
Maximum Fax Rate	14.4Kbps
Data Modulation Protocol	Bell 103/212A, ITU-T V.34, V.FC, V.32terbo, V.32bis, V.32, V.25, V.23, V.22bis, V.22, V.21
Fax Modulation Protocol	V.17, V.29, V.27ter, V.21
Error Correction/Compression	V.42, V.42bis, MNP5
Fax Class	Class I & II
Data Bus	External

CONNECTIONS
Function	Label		Function		Label
DC power		CN1		RJ-45 jack channel 2		CN12
RJ-11 jack channel 1		CN2		RJ-45 jack channel 3		CN13
RJ-11 jack channel 2		CN3		RJ-45 jack channel 4		CN14
RJ-11 jack channel 3		CN4		RJ-45 jack channel 5		CN15
RJ-11 jack channel 4		CN5		RJ-45 jack channel 6		CN16
RJ-11 jack channel 5		CN6		RJ-45 jack channel 7		CN17
RJ-11 jack channel 6		CN7		RJ-45 jack channel 8		CN18
RJ-11 jack channel 7		CN8		Unidentified		CN19
RJ-11 jack channel 8		CN9		Unidentified		CN20
Unidentified		CN10		Power switch		SW1
RJ-45 jack channel 1		CN11

USER CONFIGURABLE SETTINGS
Setting	Label	Position
DTR normal operation	SW2/1	Off
DTR always on	SW2/1	On
Verbal result codes	SW2/2	Off
Numeric result codes	SW2/2	On
Result codes disabled	SW2/3	Off
Result codes enabled	SW2/3	On
Command mode local echo enabled	SW2/4	Off
Command mode local echo disabled	SW2/4	On
Auto-answer enabled	SW2/5	Off
Auto-answer disabled	SW2/5	On
Carrier detect normal operation	SW2/6	Off
Carrier detect always on	SW2/6	On
Result codes in Originate and Answer mode	SW2/7	Off
Result codes in Originate mode only	SW2/7	On
Command recognition disabled	SW2/8	Off
Command recognition enabled	SW2/8	On
Modem hangs up and returns to command mode	SW2/9	Off
Modem maintains connection, returns to command mode	SW2/9	On
Load settings from NVRAM	SW2/10	Off
Load fail-safe settings from ROM	SW2/10	On
Factory configured - do not alter	SW3/3-10	Unidentified

CONSOLE PORT BAUD RATE
Rate	SW3/1	SW3/2
9600bps	Off	Off
19.2Kbps	Off	On
38.4Kbps	On	Off
57.6Kbps	On	On

DIAGNOSTIC LED(S)
LED	Color	Status	Condition
LED1	Off	Off	Power off
LED1	Green	On	Power on
LED1	Red	On	Critical failure
LED2	Off	Off	Channel 1 is idle
LED2	Green	On	Channel 1 is online
LED2	Orange	On	Channel 1 is dialing
LED2	Green	Flashing	Channel 1 is testing/SDL
LED2	Red	On	Channel 1 critical failure
LED3	Off	Off	Channel 2 is idle
LED3	Green	On	Channel 2 is online
LED3	Orange	On	Channel 2 is dialing
LED3	Green	Flashing	Channel 2 is testing/SDL
LED3	Red	On	Channel 2 critical failure

DIAGNOSTIC LED(S) (CONT.)
LED	Color	Status	Condition
LED4	Off	Off	Channel 3 is idle
LED4	Green	On	Channel 3 is online
LED4	Orange	On	Channel 3 is dialing
LED4	Green	Flashing	Channel 3 is testing/SDL
LED4	Red	On	Channel 3 critical failure
LED5	Off	Off	Channel 4 is idle
LED5	Green	On	Channel 4 is online
LED5	Orange	On	Channel 4 is dialing
LED5	Green	Flashing	Channel 4 is testing/SDL
LED5	Red	On	Channel 4 critical failure
LED6	Off	Off	Channel 5 is idle
LED6	Green	On	Channel 5 is online
LED6	Orange	On	Channel 5 is dialing
LED6	Green	Flashing	Channel 5 is testing/SDL
LED6	Red	On	Channel 5 critical failure
LED7	Off	Off	Channel 6 is idle
LED7	Green	On	Channel 6 is online
LED7	Orange	On	Channel 6 is dialing
LED7	Green	Flashing	Channel 6 is testing/SDL
LED7	Red	On	Channel 6 critical failure
LED8	Off	Off	Channel 7 is idle
LED8	Green	On	Channel 7 is online
LED8	Orange	On	Channel 7 is dialing
LED8	Green	Flashing	Channel 7 is testing/SDL
LED8	Red	On	Channel 7 critical failure
LED9	Off	Off	Channel 8 is idle
LED9	Green	On	Channel 8 is online
LED9	Orange	On	Channel 8 is dialing
LED9	Green	Flashing	Channel 8 is testing/SDL
LED9	Red	On	Channel 8 critical failure
LED10	Green	On	Management station status normal
LED10	Red	On	Management station has suffered a critical SNMP agent failure
LED10	Green	Flashing	Management station is testing/SDL
LED10	Green/Red	Flashing	Management station has suffered a non-critical failure
LED10	Off	Off	Management station power is off
LED11	Green	On	Management station status normal
LED11	Red	On	Management station has suffered a critical MP/8 failure
LED11	Off	Off	Management station power is off
LED12	Green	On	Management station is transmitting on LAN port
LED12	Off	Off	Management station is not transmitting on LAN port
LED13	Green	On	Management station is receiving on LAN port
LED13	Orange	On	Rate of incoming Ethernet data exceeds processing capability of system
LED13	Red	On	Rate of incoming Ethernet data exceeds memory resources of system
LED13	Off	Off	Rate of incoming data within processing/memory resources of system

DIAGNOSTIC LED(S) (CONT.)
LED	Color	Status	Condition
LED14	Green	On	Management station is transmitting on WAN port
LED14	Off	Off	Management station is not transmitting on WAN port
LED15	Green	On	Management station is receiving on WAN port
LED15	Off	Off	Management station is not receiving on WAN port

SUPPORTED COMMAND SET

Basic AT Commands

AT, ‘+++’, A/

A, B, C, E, F, H, M, O, V

&C, &G, &L, &X, &Z

S Registers

S0, S1, S2, S3, S4, S5, S6, S7, S8, S9, S10, S11, S12, S18, S26

Note: See MHI Help File for full command documentation.

HELP
Type:	Immediate
Format:	AT [cmds] $ [cmds]
Description:	Displays the help screen

REPEAT LAST COMMAND
Type:	Immediate
Format:	AT [cmds] A> [cmds]
Description:	Repeat last command until canceled by pressing any key.

DIAL
Type:	Immediate
Format:	AT [cmds] D<#> [cmds]
Description:	Dials telephone number according to any modifiers included in the string
Note:	Any combination of modifiers can be used to produce the desired dial functions in sequence.
Command	Function
DL	Re-dial last number
DP	Pulse dialing enabled
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"WXY"	Optional method of denoting telephone numbers. Letters enclosed in quotes are interpreted as numbers according to the system found on a telephone keypad.
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.
D$	Wait for prompt tone detection function enabled. Waits for prompt tone for amount of time specified by the S7 command.
D;	Modem returned to idle state after dialing. The semicolon can only be placed at the end of the dial command.
D"	Dial the letters that follow
D/	Pause for 125 milliseconds

REPORT INFORMATION
Type:	Immediate
Format:	AT [cmds] In [cmds]
Description:	Displays information requested
Command	Function
I0	Reports 4 digit product code
I1	Reports results of ROM checksum
I2	Reports results of RAM test
I3	Reports the product name
I4	Reports the current modem settings
I5	Reports the settings stored in NVRAM
I6	Reports statistics for the last call
I7	Reports product configuration
I10	Reports dial security account status information
I11	Displays high speed connection report
I15	Reports caller ID information

MODEM CLOCK
Type:	Configuration
Format:	AT [cmds] Kn [cmds]
Description:	Controls the modem clock
Command	Function
í K0	If on-line, display current call duration; if off-line, display the last call’s duration
K1	Display the actual time (set clock using ATI3=HH:MM:SS K1)

SPEAKER VOLUME
Type:	Configuration
Format:	AT [cmds] Ln [cmds]
Description:	Controls speaker volume
Command	Function
L0	Low volume setting
L1	Low volume setting
í L2	Medium volume setting
L3	Highest volume setting

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	Suppress result codes when answering

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	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.
í X4	Busy and dial tone detection enabled; result codes 0 - 7 & 10 enabled.
X5	Busy tone detection enabled; dial tone detection disabled; all result codes enabled
X6	All result codes enabled
X7	Voice detection disabled; all result codes enabled

RESET
Type:	Configuration
Format:	AT [cmds] &Zn [cmds]
Description:	Reset the modem. If SW2/10 is set to off, revert to the settings in NVRAM. If SW2/10 is set to on, reset to the &F0 configuration template.

ADDITIONAL RESULT CODES
Type:	Configuration
Format:	AT [cmds] &An [cmds]
Description:	Controls the display of the additional result codes
Command	Function
í &A0	Do not display ARQ result codes
&A1	Display ARQ result codes
&A2	Display ARQ result codes, HST, V.32, V.FC or V.34 modulation indicator
&A3	Display ARQ result codes and error control indicator LAPM, HST, MNP, SYNC, or NONE

SERIAL PORT RATE
Type:	Configuration
Format:	AT [cmds] &Bn [cmds]
Description:	Controls the serial port rate
Command	Function
í &B0	Variable serial port rate
&B1	Fixed serial port rate
&B2	In answer mode use fixed rate for ARQ calls and variable rate for non ARQ calls.

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.

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
í &F0	Load No Flow Control template settings
&F1	Load Hardware Flow Control template settings
&F2	Load Software Flow Control template settings

TRANSMIT DATA FLOW CONTROL
Type:	Configuration
Format:	AT [cmds] &Hn [cmds]
Description:	Controls the transmit data flow
Command	Function
í &H0	Flow control disabled
&H1	Hardware flow control enabled
&H2	Software flow control enabled
&H3	Hardware and software flow control enabled

RECEIVE DATA FLOW CONTROL
Type:	Configuration
Format:	AT [cmds] &In [cmds]
Description:	Controls the receive data flow control
Command	Jack Type
í &I0	Disables XON/XOFF flow control
&I1	Modem acts on typed XON/XOFF commands, Ctrl -S, or Ctrl -Q and passes them to remote device
&I2	Modem acts on typed XON/XOFF commands but removes them from data stream
&I3	Hewlett Packard host mode
&I4	Hewlett Packard terminal mode
&I5	Enable flow control on the phone link when the connection is not under error control

DATA COMPRESSION
Type:	Configuration
Format:	AT [cmds] &Kn [cmds]
Description:	Controls the data compression
Command	Function
&K0	Data compression disabled
í &K1	Use auto enable/disable data compression
&K2	Data compression always enabled
&K3	Selective data compression

ERROR CONTROL
Type:	Configuration
Format:	AT [cmds] &Mn [cmds]
Description:	Selects the error control protocol
Command	Mode
í &M0	Normal mode, no error control
&M4	Normal/ARQ mode
&M5	ARQ asynchronous mode
&M6	V.25bis synchronous mode

CONNECTION RATE
Type:	Configuration
Format:	AT [cmds] &Nn [cmds]
Description:	Controls the connection rate
Command	Function
í &N0	Variable rate
&N1	300bps
&N2	1200bps
&N3	2400bps
&N4	4800bps
&N5	7200bps
&N6	9600bps
&N7	12Kbps
&N8	14.4Kbps
&N9	16.8Kbps
&N10	19.2Kbps
&N11	21.6Kbps
&N12	24Kbps
&N13	26.4Kbps
&N14	28.8Kbps
&N15	31.2Kbps
&N16	33.6Kbps

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)

RTS/CTS
Type:	Configuration
Format:	AT [cmds] &Rn [cmds]
Description:	Selects RTS/CTS options
Command	Function
í &R0	CTS follows RTS in data mode; RTS is ignored in command mode.
&R1	CTS forced high, RTS is ignored.
&R2	Enable hardware flow control of received data

DATA SET READY (DSR)
Type:	Configuration
Format:	AT [cmds] &Sn [cmds]
Description:	Selects DSR options
Command	Function
&S0	DSR forced high
í &S1	DSR high only while modem is handshaking or connected
&S2	DSR & CTS follows CD when carrier is lost
&S3	DSR follows CD when carrier is lost
&S4	Send the computer a DSR signal at the same time as the CD
&S5	Send DSR normally, and follow CTS with CD

TEST MODES
Type:	Immediate
Format:	AT [cmds] &Tn
Description:	Selects test options
Command	Function
&T0	End current test
&T3	Begin local digital loopback
&T4	Grant remote digital loopback request
&T5	Deny remote digital loopback request
&T6	Request remote digital loopback
&T7	Request remote digital loopback and self-test

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

BREAK HANDLING
Type:	Configuration
Format:	AT [cmds] &Yn [cmds]
Description:	Controls the break handling
Command	Function
í &Y0	Destructive, don’t send break
&Y1	Destructive, expedited break sent
&Y2	Nondestructive, expedited break sent
&Y3	Nondestructive, un-expedited break sent

STORE COMMAND STRING
Type:	Configuration
Format:	AT [cmds] &ZCn=(phone # & modifiers)
Description:	Writes selected command string into the non-volatile memory at location n
Note: The command string can be up to 30 characters long; spaces do not count.

SECURITY ACCOUNTS
Type:	Configuration
Format:	AT [cmds] %An [cmds]
Description:	Create and configure security accounts

SERIAL PORT RATE
Type:	Configuration
Format:	AT [cmds] %Bn [cmds]
Description:	Remotely configure a modem’s serial port rate
Command	Function
%B0	110bps
%B1	300bps
%B2	600bps
%B3	1200bps
%B4	2400bps
%B5	4800bps
%B6	9600bps
%B7	19200bps
%B8	38400bps
%B9	57600bps
%B10	115200bps

REMOTE CONFIGURATION
Type:	Configuration
Format:	AT [cmds] %Cn [cmds]
Description:	Controls the remote configuration
Command	Function
%C0	Defer configuration changes until the call is ended
%C1	Cancel configuration changes and restore the original configuration
%C2	Force configuration changes to take effect immediately

ERASE SECURITY SETTINGS
Type:	Configuration
Format:	AT [cmds] %En [cmds]
Description:	Erases selected security settings
Command	Function
%E1	Erase local access password
%E2	Erase autopass password
%E3	Erase passwords in accounts 0-9
%E4	Erase phone numbers in accounts 0-9
%E5	Disable account, dialback, and new number fields in accounts 0-9

REMOTE CONFIGURATION
Type:	Configuration
Format:	AT [cmds] %Fn [cmds]
Description:	Configure another device’s data remotely
Command	Function
%F0	No parity, 8 data bits
%F1	Mark parity, 7 data bits
%F2	Odd parity, 7 data bits
%F3	Even parity, 7 data bits

LOCAL ACCESS PASSWORD
Type:	Configuration
Format:	AT [cmds] %Ln [cmds]
Description:	Set local access password

PASSWORD SECURITY
Type:	Immediate
Format:	AT [cmds] %P [cmds]
Description:	Disable password security

SECURITY ACCOUNTS
Type:	Configuration
Format:	AT [cmds] %Sn [cmds]
Description:	Access security accounts

TONE FREQUENCIES
Type:	Configuration
Format:	AT [cmds] %Tn [cmds]
Description:	Enalbes recognition of the tone frequencies

ASSIGN PASSWORD
Type:	Immediate
Format:	AT [cmds] %V=PWn [cmds]
Description:	Assign the password in account n in security account as autopass password

HELP
Type:	Configuration
Format:	AT [cmds] #$ [cmds]
Description:	Display the help pannels for the octothorpe (#) command set

CALLER ID
Type:	Configuration
Format:	AT [cmds] #CID=n [cmds]
Description:	Controls the Caller ID function
Command	Function
#CID=0	Caller ID disabled
#CID=1	Caller ID displays formatted data
#CID=2	Caller ID displays raw hexadecimal data
#CID=3	Enable caller ID with formatted output and name suppressed
#CID=4	Enable caller ID but do not transmit the information to computer

BIT-MAPPED REGISTER S13
Format:		AT [cmds] S13=n [cmds]
Default:		170
Range:		0-174
Unit:		Bit-mapped
Description:		Controls echo, result codes and display, dial mode, and answer/originate mode.
Bit	Value	Function
0	1	Reset when DTR drops
1	2	Reverse normal auto answer mode
2	4	Disable 250 msec pause before result code display
3	8	On DTR signal, Autodial the number stored in NVRAM at position 0
4	16	At power on/reset, auto dial number stored in NVRAM at position 0
5	32	Disable HST
6	64	Disable MNP level 3
7	128	Hardware reset

BIT-MAPPED REGISTER S14
Format:		AT [cmds] S14=n [cmds]
Default:		170
Range:		0-174
Unit:		Bit-mapped
Description:		Controls echo, result codes and display, dial mode, and answer/originate mode.
Bit	Value	Function
0	í 1	Disconnect on escape code
1	2	Send result codes only when originating a call

BIT MAPPED REGISTER
Type:		Register
Format:		AT [cmds] S15=n [cmds]
Unit:		Bit-mapped
Description:		Controls fallback
Bit	Value	Function
0	1	Disable the modem’s extra high frequency equalization if it causes problems on shorter -link calls- for HST modulation only
1	2	Disable online fallback
2	4	Disable 450bps back channel ---HST only
3	8	Reset non-ARQ mode transmit buffer from 1.5Kbytes to 128
4	16	Disable MNP level 4
5	32	Set backspace key to delete
6	64	Alternate MNP setting for some 2400bps MNP modems not made by U.S. Robotics of Microcom.
7	128	Custom applications only

BIT MAPPED REGISTER S16
Type:		Register
Format:		AT [cmds] S16=n [cmds]
Unit:		Bit-mapped
Description:		Controls loopback tests and test pattern
Bit	Value	Function
2	4	Test pattern
3	8	Remote digital loopback

INACTIVITY TIMER
Type:	Register
Format	AT [cmds] S19=n [cmds]
Default:	Unidentified
Range:	Unidentified
Unit:	Minute
Description:	Sets the duration in minutes for the inactivity timer, S19=0 disables the timer

BREAK LENGTH
Format	AT [cmds] S21=n [cmds]
Default:	Unidentified
Range:	Unidentified
Unit:	10msec
Description:	Sets the duration of breaks sent from the modem to the computer or terminal

XON CHARACTER
Format	AT [cmds] S22=n [cmds]
Default:	17
Range:	Unidentified
Unit:	ASCII
Description:	Stores the ASCII code for XON character

FLOW CONTROL CHARACTER - XOFF
Format	AT [cmds] S23=n [cmds]
Default:	19
Range:	Unidentified
Unit:	ASCII
Description:	Stores the ASCII code for the XOFF character

DSR SIGNAL
Type:	Register
Format	AT [cmds] S24=n [cmds]
Default:	150
Range:	Unidentified
Unit:	.02 sec
Description:	Sets the duration between pulsed DSR signals when the modem is set to &S2 or &S3.

DSR RECOGNITION
Type:	Register
Format	AT [cmds] S25=n [cmds]
Default:	5
Range:	Unidentified
Unit:	.1 second
Description:	Sets DTR recognition time

BITMAPPED REGISTER S27
Format		AT [cmds] S27=n [cmds]
Default:		Unidentified
Range:		0
Unit:		Bit-mapped
Description:		Selects modulation
Bit	Value	Function
0	1	Enable ITU-T V.21
1	2	Enable unencoded modulation in V.32 mode
2	4	Disable V.32 modulation
3	8	Disabl;e 2100Hz answer tone
4	0 16 32 48	Complete handshaking sequence:V.42 detection, LAPM error control, MNP Disable MNP Disable V.42 detection and LAPM Disable detection phase
5	0 16 32 48	Complete handshaking sequence:V.42 detection, LAPM error control, MNP Disable MNP Disable V.42 detection and LAPM Disable detection phase
7	128	Unusual software incompatibility

BIT-MAPPED REGISTER S28
Format	AT [cmds] S28=n [cmds]
Default:	Unidentified
Range:	8
Unit:	.1 second
Description:	Sets the duration of the extra 3000/600 Hz answer tones sent during handshaking.

BITMAPPED REGISTER S29
Type:	Register
Format	AT [cmds] S29=n [cmds]
Default:	20
Range:	Unidentified
Unit:	.1 sec
Description:	Sets the duration of the V.21 answer tone

VOICE/DATA SWITCH
Type:	Register
Format	AT [cmds] S32=n [cmds]
Default:	9
Range:	Unidentified
Unit:	Unidentified
Description:	Assign voice/data switch function
Value	Function
0	Disabled
1	Voice/data - originate mode
2	Voice/data - answer mode
3	Radial last number
4	Dial number stored at position 0
5	Auto answer on/off toggle
6	Reset modem
7	Initiate remote digital loopback
8	Busy out the phone line toggle
9	Execute stored command

BIT-MAPPED REGISTER S34
Type:		Register
Format:		AT [cmds] S34n [cmds]
Default:		0
Range:		Unidentified
Unit:		Unidentified
Description:		Controls V.32bis
Bit	Value	Function
0	1	Disable V.32bis
1	2	Disable modem’s enhanced proprietary V.32bis modulation
2	4	Disable the faster retrains that occure during proprietary V.32terbo modulation
3	8	Enable V.23
4	16	Force the MR LED to show DSR
5	32	Enable MI/MIC
6	64	Disable the remote access busy message
7	128	Disable V.32terbo

TRANSMIT BUFFER
Type:	Register
Format	AT [cmds] S38n [cmds]
Description:	Sets the time before a forced hang up and clearing of the transmit buffer when DTR drops during an ARQ call.

REMOTE ACCESS
Type:	Register
Format	AT [cmds] S41=n [cmds]
Description:	Sets the number of allowable remote access login attempts, thus enabling or disabling remote access.

REMOTE ACCESS ESCAPE CHARACTER
Type:	Register
Format	AT [cmds] S42=n [cmds]
Default:	126
Range:	Unidentified
Unit:	Unidentified
Description:	Stores the ASCII decimal code for the remote access escape character.

GUARD TIME DURATION
Type:	Register
Format	AT [cmds] S43=n [cmds]
Default:	200
Unit:	.02 sec
Description:	Sets the duration of the guard time for the remote access sequence

REESTABLISHING CONNECTION INTERVAL
Format	AT [cmds] S44=n [cmds]
Default:	15
Description:	Sets the duration of the interval between losing carrier and reestablishing a connection

BIT-MAPPED REGISTER S51
Format		AT [cmds] S51=n [cmds]
Default:		0
Range:		Unidentified
Unit:		Bit-mapped
Description:		MNP/V.42 control
Bit	Value	Function
0	1	Disable MNP/V.42 for V.22
1	2	Disable MNP/V.42 for V.22bis
2	4	Disable MNP/V.42 for V.32/V.32bis/V.32terbo
6	64	Disable selective reject
7	128	Enable handset exclusion delay

BIT MAPPED REGISTER S53
Type:			Register
Format:		AT [cmds] S53=n [cmds]
Description:		Bit mapped register
Bit	Value		Function
0	1		Dial security enabled
1	2		Prompting enabled
2	4		Local access password protection enabled

BIT MAPPED REGISTER S54
Type:			Register
Format:		AT [cmds] S54=n [cmds]
Description:		Bit mapped register
Bit	Value		Function
0	1		Disable 2400 symbol rate
1	2		Disable 2743 symbol rate
2	4		Disable 2800 symbol rate
3	8		Disable 3000 symbol rate
4	16		Disable 3200 symbol rate
5	32		Disable 3429 symbol rate
6	64		Disable Call Indicate
7	128		Disable V.8