CONNECTIONS
Purpose	Location	Purpose	Location
RETURN button	BT1	Leased line out	CN3
DOWN button	BT2	120VAC power	CN4
ACROSS button	BT3	RS-232/422	CN5
ENTER button (Talk/Data)	BT4	Network control out	CN6
Switched line out	CN1	Network control in	CN7
Line in	CN2	Power switch	SW1

ELECTRICAL INTERFACE SELECTION
Interface	SW2/1
» EIA/TIA 232-D	On
ITU-T V.35	Off

TEST/BUSY OUT ON PIN 25
Mode	SW2/2
» Enable busy out when pin 25 is high	Off
Self test is in progress when pin 25 is high	On

FRONT PANEL CONFIGURATION
Mode	SW2/3
» Front panel enabled	Off
Front panel disabled	On

RESET MEMORY
Mode	SW2/4
» Normal operation	Off
Reset modem to factory settings	On

COMMAND SETS
Mode	SW2/5
» Command sets enabled	Off
Command sets disabled	On

FACTORY CONFIGURED - DO NOT ALTER
Switch	Position
SW2/6	Off

DIAGNOSTIC LED(S)
LED	Color	Status	Condition
RD	Red	On	Modem is receiving data
RD	Red	Off	Modem is not receiving data
TR	Red	On	DTR signal is high
TR	Red	Off	DTR signal is low
RI/OH	Red	On	Switched line is off-hook or is ringing
RI/OH	Red	Off	Switched line is on-hook and is not ringing
TD	Red	On	Modem is transmitting data
TD	Red	Off	Modem is not transmitting data
CD	Red	On	Carrier signal detected
CD	Red	Off	Carrier signal not detected
RC/NC	Red	On	Modem is under remote or network control
RC/NC	Red	Off	Modem is under local control

ADAPTIVE RATE
Type:	Configuration
Format:	AT [cmds] *APn [cmds]
Example:	AT *EC0 *DC1 *AP0<CR>
Description:	Selects whether the modem will automatically adjust its speed according to line conditions.
Command	Function
*AP0	Adaptive rate disabled.
*AP1	Adaptive rate enabled.

ANSWER/ORIGINATE MODE
Type:	Configuration
Format:	AT [cmds] *CAn [cmds]
Example:	AT *CA2<CR>
Description:	Selects whether the modem is in answer or originate mode.
Command	Function
*CA0	Modem is in originate mode.
*CA1	Modem is in answer mode.
*CA2	Modem is in answer mode only if pin 11 of the serial interface is high.
*CA3	Modem switches to originate mode after auto-answer.

AUTO-ANSWER
Type:	Configuration
Format:	AT [cmds] *AAn [cmds]
Example:	AT *AA5 S0=3<CR>
Description:	Configures the modem’s response to an incoming call.
Command	Function
*AA0	Modem will not answer incoming call.
*AA1	Modem will answer incoming call on first ring.
*AA2	Modem will answer incoming call on second ring.
*AA3	Modem will answer incoming call on fourth ring.
*AA4	Modem will answer incoming call on eighth ring.
*AA5	Modem will answer according to register S0.

AUTO-ANSWER - SWITCHED LINE
Type:	Configuration
Format:	AT [cmds] *ASn [cmds]
Example:	AT *AS0 H1 DT555-1212<CR>
Description:	Selects whether the modem will answer an incoming switched line call while connected over the leased line.
Command	Function
*AS0	Modem will ignore incoming switched line call.
*AS1	Modem will disconnect from leased line to answer switched line call.

BLIND DIALING DELAY
Type:	Configuration
Format:	AT [cmds] *BDn [cmds]
Example:	AT *BD2 S6=3<CR>
Description:	Configures how long the modem will wait before it begins dialing when in blind dial mode.
Command	Function
*BD0	Modem will wait 2 seconds before dialing.
*BD1	Modem will wait 4 seconds before dialing.
*BD2	Modem will wait according to register S6.

BUFFER SIZE
Type:	Configuration
Format:	AT [cmds] *NBn [cmds]
Example:	AT *NB0<CR>
Description:	Selects the modem’s transmit/receive buffer size.
Command	Function
*NB0	Normal buffer size.
*NB1	Small buffer size.

BUSY OUT ON TEST MODE
Type:	Configuration
Format:	AT [cmds] *LLn [cmds]
Example:	AT *LL1 <CR>
Description:	Sends busy signal when modem is in a test mode.
Command	Function
*LL0	Do not send busy signal when modem is in test mode.
*LL1	Send busy signal when modem is in test mode.

BREAK TYPE
Type:	Configuration
Format:	AT [cmds] *BKn [cmds]
Example:	AT *BK0<CR>
Description:	Configures action of break signal.
Command	Function
*BK0	Break empties buffer and is sent immediately.
*BK1	Break does not empty buffer and is sent immediately.
*BK2	Break does not empty buffer and is sent in sequence.

CALLBACK DIAL TONE TIME
Type:	Register
Format:	AT [cmds] S45=n [cmds]
Example:	ATS45=2<CR>
Default:	5
Range:	0-10
Unit:	1 second
Description:	Sets the length of the dialtone generated by the callback feature to prompt for the password.

CALLBACK NUMBER SOURCE
Type:	Configuration
Format:	AT [cmds] *ZCn [cmds]
Example:	AT *ZC10 *ZIsnarf<CR>
Description:	Configures where the callback function will obtain the number to call.
Command	Function
*ZC0	Callback function disabled.
*ZC10	Callback function will dial the number provided by the remote user.
*ZC12	Callback function will dial the number stored in the memory location provided by the remote user.

CALLBACK ONLY MODE
Type:	Configuration
Format:	AT [cmds] *ZRn [cmds]
Example:	AT *ZR0 S0=2<CR>
Description:	Sets whether the modem is callback-only.
Command	Function
*ZR0	Modem will accept both normal calls and callback calls.
*ZR1	Modem will only accept callback calls.

CALLBACK PASSWORD
Type:	Configuration
Format:	AT [cmds] *ZIxxxx
Example:	AT *ZC10 *ZIsnarf<CR>
Description:	Sets the callback password to xxxx. The password must not be more than 10 characters.

CALLBACK PASSWORD TIME
Type:	Register
Format:	AT [cmds] S46=n [cmds]
Example:	ATS46=18<CR>
Default:	12
Range:	0-255
Unit:	1 second
Description:	Sets the length of time in which the callback password must be entered.

CALLBACK RINGBACK TONE
Type:	Configuration
Format:	AT [cmds] *ZSn [cmds]
Example:	AT *ZP2 *ZS1<CR>
Description:	Selects whether the modem will generate a ringback tone upon receiving the correct callback password.
Command	Function
*ZS0	Modem will not generate ringback tone.
*ZS1	Modem will generate ringback tone.

CALLBACK SECURITY
Type:	Configuration
Format:	AT [cmds] *ZVn [cmds]
Example:	AT *ZV1 S0=1<CR>
Description:	Enables security for the callback function.
Command	Function
*ZV0	Disables password verification and disables callback mode..
*ZV1	Enables password verification by the modem.

CALLBACK STORED NUMBER
Type:	Configuration
Format:	AT [cmds] *ZCn [cmds]
Example:	AT *ZC3 *ZIsnarf<CR>
Description:	Callback function will dial the number stored in memory location n.

CALLBACK TONES
Type:	Configuration
Format:	AT [cmds] *ZPn [cmds]
Example:	AT *ZP2 *ZS1<CR>
Description:	Selects which tones the callback function will use to indicate operation.
Command	Function
*ZP0	Callback tones disabled.
*ZP1	Generate dialtone to prompt for password.
*ZP2	Generate answer tone after password.
*ZP3	Generate both tones.

CALL WAIT TIMER
Type:	Configuration
Format:	AT [cmds] *TTn [cmds]
Example:	AT *TT5 S7=120<CR>
Description:	Sets the length of time that the modem will wait for a call to succeed.
Command	Function
*TT0	Modem will wait for 30 seconds.
*TT1	Modem will wait for 45 seconds.
*TT2	Modem will wait for 60 seconds.
*TT3	Modem will wait for 90 seconds.
*TT4	Modem will wait for 180 seconds.
*TT5	Modem will wait according to register S7.

CD SIGNAL
Type:	Configuration
Format:	AT [cmds] &Cn [cmds]
Example:	AT &C3 *RS1 *SR1<CR>
Description:	Configures the behavior of the carrier detect signal.
Command	Function
&C0	CD forced high.
&C1	CD normal.
&C2	CD forced high except during handshaking and disconnecting.
&C3	CD follows remote RTS signal.
&C4	CD forced high except during disconnecting.

CD SIGNAL REACTION
Type:	Configuration
Format:	AT [cmds] *CDn [cmds]
Example:	AT *CD2<CR>
Description:	Configures the modem’s response to loss of the carrier signal.
Command	Function
*CD0	Modem ignores low CD.
*CD1	Modem will wait for 3 seconds of low CD before disconnecting.
*CD2	Modem will wait for 7 seconds of low CD before disconnecting.
*CD3	Modem will wait according to register S10.

COMPRESSION
Type:	Configuration
Format:	AT *DCn
Example:	AT *EC0 *DC1 *AP0<CR>
Description:	Selects data compression.
Command	Function
*DC0	Data compression disabled.
*DC1	Data compression enabled.

CONNECT MESSAGE
Type:	Configuration
Format:	AT [cmds] *MSn [cmds]
Example:	AT *MS0<CR>
Description:	Selects whether CONNECT message is sent before or after the carrier detect signal is high.
Command	Function
*MS0	CONNECT sent after CD is high.
*MS1	CONNECT sent before CD is high.

CONNECT MODE
Type:	Configuration
Format:	AT [cmds] *SMn [cmds]
Example:	AT *SM1 DT555-1212<CR>
Description:	Sets connect mode.
Command	Function
*SM1	Direct mode.
*SM0	Normal mode.
*SM2	Reliable mode.
*SM3	Auto-reliable mode.
*SM4	If modem connects at faster than 1200bps, reliable mode will be used. At 1200bps or slower, normal mode will be used for asynchronous connections and direct mode for synchronous connections.

CONNECTION SPEED LOWER LIMIT
Type:	Configuration
Format:	AT [cmds] *MNn [cmds]
Example:	AT *MN6 *MX14 *MM11<CR>
Description:	Sets slowest allowed connection speed.
Command	Function
*MN0	Select 300bps minimum speed.
*MN1	Select 1200bps minimum speed.
*MN2	Select 2400bps minimum speed.
*MN3	Select 4800bps minimum speed.
*MN4	Select 7200bps minimum speed.
*MN5	Select 9600bps minimum speed.
*MN6	Select 12Kbps minimum speed.
*MN7	Select 14.4Kbps minimum speed.
*MN8	Select 16.8Kbps minimum speed.
*MN9	Select 19.2Kbps minimum speed.
*MN10	Select 21.6Kbps minimum speed.
*MN11	Select 24Kbps minimum speed.
*MN12	Select 26.4Kbps minimum speed.
*MN13	Select 28.8Kbps minimum speed.

CONNECTION SPEED UPPER LIMIT
Type:	Configuration
Format:	AT [cmds] *MXn [cmds]
Example:	AT *MN6 *MX14 *MM11<CR>
Description:	Sets fastest allowed connection speed.
Command	Function
*MX0	Select 300bps maximum speed.
*MX1	Select 1200bps maximum speed.
*MX2	Select 2400bps maximum speed.
*MX3	Select 4800bps maximum speed.
*MX4	Select 7200bps maximum speed.
*MX5	Select 9600bps maximum speed.
*MX6	Select 12Kbps maximum speed.
*MX7	Select 14.4Kbps maximum speed.
*MX8	Select 16.8Kbps maximum speed.
*MX9	Select 19.2Kbps maximum speed.
*MX10	Select 21.6Kbps maximum speed.
*MX11	Select 24Kbps maximum speed.
*MX12	Select 26.4Kbps maximum speed.
*MX13	Select 28.8Kbps maximum speed.

CTS SIGNAL
Type:	Configuration
Format:	AT [cmds] *CTn [cmds]
Example:	AT *CT0<CR>
Description:	Selects the function of the CTS signal.
Command	Function
*CT0	CTS forced high.
*CT1	CTS normal.
*CT2	CTS forced high in command mode, forced low during handshaking and retraining, and follows RTS in data mode.
*CT3	CTS forced high in asynchronous mode and behaves like *CT2 in synchronous mode.
*CT4	CTS follows RTS.

CTS/RTS DELAY
Type:	Configuration
Format:	AT [cmds] *DLn [cmds]
Example:	AT *DL1 O<CR>
Description:	When CTS is set to follow RTS, sets the delay between the RTS signal going high and CTS following.
Command	Function
*DL0	CTS follows RTS immediately.
*DL1	CTS follows RTS after 15ms.
*DL2	CTS follows RTS after 60ms.
*DL3	CTS follows RTS after 90ms.
*DL4	CTS follows RTS according to S26.

DIAL
Type:	Immediate
Format:	AT [cmds] D<#> [; cmds]
Example:	AT H1 DT 9W *70, 1(303) 555-1212<CR>
Description:	Dials telephone number according to any modifiers included in the string.
Modifier	Function
DK	Dialing paused for amount of time specified in S8 register.
DP	Pulse dialing enabled.
DR	Dial in answer mode.
DS=n	Number in memory location n dialed.
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 amount of time specified in S8 register.
D!	Flash function initiated. Modem commanded to go on-hook for specified time.
D@	Modem waits for a ring-back signal followed by silence up to the time specified in S7 prior to executing the rest of the dial string.
D&	Flash function initiated. Modem commanded to go on-hook for specified time.
D;	Modem returned to idle state after dialing. The semicolon can only be placed at the end of the dial command.
D:	Dialing resumed following dial tone detection.

DIAL PAUSE TIME
Type:	Configuration
Format:	AT [cmds] *DPn [cmds]
Example:	AT *DP9 S8=1<CR>
Description:	Sets the time the modem will wait when it encounters a pause symbol in a dial string.
Command	Function
*DP0	Modem will pause for 3 seconds.
*DP1	Modem will pause for 6 seconds.
*DP2	Modem will pause for 9 seconds.
*DP3	Modem will pause for 12 seconds.
*DP4	Modem will pause according to register S8.

DIAL RESTRICTIONS
Type:	Configuration
Format:	AT [cmds] *ZDn [cmds]
Example:	AT *ZD10 S0=1<CR>
Description:	Sets the restrictions on dial commands.
Command	Function
*ZD0	Unrestricted dialing.
*ZD1	Redial and auto-redial disabled.
*ZD2	Manual dial, redial, and auto-redial disabled; only stored numbers may be dialed.

DIAL TONE WAIT TIME
Type:	Configuration
Format:	AT [cmds] *DDn [cmds]
Example:	AT *DD9 S7=1<CR>
Description:	Configures how long the modem will wait for a dial tone.
Command	Function
*DD0	Modem will wait 2 seconds for dial tone.
*DD1	Modem will wait 3 seconds for dial tone.
*DD2	Modem will wait 4 seconds for dial tone.
*DD3	Modem will wait 6 seconds for dial tone.
*DD4	Modem will wait 12 seconds for dial tone.
*DD5	Modem will wait 15 seconds for dial tone.
*DD6	Modem will wait 20 seconds for dial tone.
*DD7	Modem will wait 30 seconds for dial tone.
*DD8	Modem will wait 40 seconds for dial tone.
*DD9	Modem will wait according to register S7.

DIAL TYPE SELECTION
Type:	Configuration
Format:	AT [cmds] *PTn [cmds]
Example:	AT *PT0 D555-1212<CR>
Description:	Selects which type of dialing will be used as default.
Command	Function
*PT0	Tone dialing will be used as default.
*PT1	Pulse dialing will be used as default.
*PT2	Attempt to use tone dialing; if this fails, use pulse dialing.

DIAL STORED PHONE NUMBER
Type:	Immediate
Format:	AT [cmds] *DSn
Example:	ATM0 *DS5<CR>
Description:	Dials a stored phone number.

DISCONNECT BUFFER MODE
Type:	Configuration
Format:	AT [cmds] *DBn [cmds]
Example:	AT *DB0<CR>
Description:	Configures when the modem will disconnect if there is data in the transmit or receive buffers.
Command	Function
*DB0	Modem will disconnect immediately.
*DB1	Modem will disconnect after time in S38 or when buffers have emptied, whichever occurs first.
*DB2	Modem will wait until buffers have emptied, then disconnect after time in S38.
*DB3	Modem will disconnect after time in S38.

DISCONNECT SEQUENCE
Type:	Configuration
Format:	AT [cmds] *MDn [cmds]
Example:	AT *MD0 <CR>
Description:	Selects whether the modem will inform the remote modem before disconnecting.
Command	Function
*MD0	Modem disconnects without signalling the remote modem.
*MD1	Modem signals the remote modem to disconnect.

DISPLAY STORED NUMBERS
Type:	Immediate
Format:	AT [cmds] *NDn [cmds]
Example:	AT*CN3,555-1212 *ND<CR>
Description:	Displays the phone number in the memory location indicated. If no location is indicated they will all be displayed.

DSR SIGNAL
Type:	Configuration
Format:	AT [cmds] *MRn [cmds]
Example:	AT *MR0<CR>
Description:	Selects the function of the DSR signal.
Command	Function
*MR0	DSR normal.
*MR1	DSR forced high.
*MR2	DSR follows DTR.
*MR3	DSR normal, except forced low on disconnect.
*MR4	DSR follows DTR, except forced low on disconnect.

DTR CHANGE DELAY
Type:	Configuration
Format:	AT [cmds] *DTn [cmds]
Example:	AT*DT0 S25=2<CR>
Description:	Sets maximum time a change in the DTR signal will be ignored.
Command	Function
*DT0	DTR will be ignored according to register S25.
*DT1	DTR will be ignored for 10 seconds.
*DT2	DTR will be ignored for 15 seconds.

DTR DIALING
Type:	Configuration
Format:	AT [cmds] *DAn [cmds]
Example:	AT *DA1 DT555-1212<CR>
Description:	Sets the DTR dialing function to dial the number at memory location n.

DTR SIGNAL
Type:	Configuration
Format:	AT [cmds] &Dn [cmds]
Example:	AT &D1<CR>
Description:	Configures the behavior of the Data Terminal Ready signal.
Command	Function
&D0	DTR forced high.
&D1	Modem will enter command mode on low DTR.
&D2	Modem will disconnect on low DTR.
&D3	Modem will disconnect and reset on low DTR.
&D4	DTR dialing enabled.
&D5	On high DTR, modem will answer an incoming call, or enable DTR dialing if no call is detected. Modem will disconnect on low DTR.
&D6	On low DTR, modem will disconnect and will not dial or answer an incoming call until DTR is high again.

ERROR CORRECTION IDENTIFICATION
Type:	Configuration
Format:	AT [cmds] *SLn [cmds]
Example:	AT *EC1 *SL1<CR>
Description:	Selects what type of error correction the modem will identify itself with to remote modems.
Command	Function
*SL0	Modem will identify itself as MNP5 modem.
*SL1	Modem will identify itself as Motorola Codex modem.

ERROR CORRECTION MODE
Type:	Configuration
Format:	AT [cmds] *ECn [cmds]
Example:	AT *EC0 *DC1 *AP0<CR>
Description:	Selects active error correction protocols.
Command	Function
*EC0	MNP and LAPM enabled.
*EC1	LAPM only enabled.
*EC2	MNP only enabled.

EXTERNAL INITIALIZATION
Type:	Configuration
Format:	AT [cmds] *OPn [cmds]
Example:	AT *OC1 *OP14 <CR>
Description:	Selects the profiles for the external initialization function.
Command	Function
*OP0	External initialization disabled.
*OP1	Select profile 2 on low signal, and profile 1 on high signal.
*OP2	Select profile 3 on low signal, and profile 1 on high signal.
*OP3	Select profile 4 on low signal, and profile 1 on high signal.
*OP4	Select profile 1 on low signal, and profile 2 on high signal.
*OP5	Select profile 3 on low signal, and profile 2 on high signal.
*OP6	Select profile 4 on low signal, and profile 2 on high signal.
*OP7	Select profile 1 on low signal, and profile 3 on high signal.
*OP8	Select profile 2 on low signal, and profile 3 on high signal.
*OP9	Select profile 4 on low signal, and profile 3 on high signal.
*OP10	Select profile 1 on low signal, and profile 4 on high signal.
*OP11	Select profile 2 on low signal, and profile 4 on high signal.
*OP12	Select profile 3 on low signal, and profile 4 on high signal.

EXTERNAL INITIALIZATION PIN SELECT
Type:	Configuration
Format:	AT [cmds] *OCn [cmds]
Example:	AT *OC1 *OP14 <CR>
Description:	Selects which pin will control the external initialization function.
Command	Function
*OC0	External initialization controlled by pin 14.
*OC1	External initialization controlled by pin 20.

FLOW CONTROL
Type:	Configuration
Format:	AT [cmds] *MFn [cmds]
Example:	AT *MF1 *DF1 *FL5<CR>
Description:	Selects flow control.
Command	Function
*MF0	Flow control disabled.
*MF1	Flow control enabled.

FLOW CONTROL TYPE
Type:	Configuration
Format:	AT [cmds] *FLn [cmds]
Example:	AT *MF1 *DF1 *FL5<CR>
Description:	Sets type of flow control used by modem.
Command	Function
*FL0	Flow control disabled.
*FL1	XON/XOFF flow control enabled.
*FL2	CTS/DTR flow control enabled.
*FL3	CTS/RTS flow control enabled.
*FL4	XON/XOFF pass-through flow control enabled.
*FL5	Synchronous transmit clock signal flow control enabled.

HANDSHAKE OPTIONS
Type:	Configuration
Format:	AT [cmds] *FCn [cmds]
Example:	AT *FC0<CR>
Description:	Disables various parts of the handshake sequence.
Command	Function
*FC0	Normal handshake sequence.
*FC1	Billing delay removed and auto-baud tone shortened by 1 second.
*FC2	*FC1 plus training time is shortened by 2 seconds in V.32 and V.32bis modes.
*FC3	*FC2 plus negotiation of error correction and compression is removed.

INACTIVITY TIMER
Type:	Configuration
Format:	AT [cmds] *SIn [cmds]
Example:	AT *SI5 S30=40<CR>
Description:	Sets the length of time that the modem does not receive information before it disconnects.
Command	Function
*SI0	Inactivity timer disabled.
*SI1	Modem will disconnect after 3 minutes of inactivity.
*SI2	Modem will disconnect after 10 minutes of inactivity.
*SI3	Modem will disconnect after 20 minutes of inactivity.
*SI4	Modem will disconnect after 30 minutes of inactivity.
*SI5	Modem will disconnect according to register S30.

LEASED LINE BACKUP - HOLD BACKUP CONNECTION
Type:	Configuration
Format:	AT [cmds] *HDn [cmds]
Example:	AT *HD2 <CR>
Description:	Configures modem to hold switched line connection while testing the leased line.
Command	Function
*HD0	Do not hold connection.
*HD1	Hold connection for 1 minute.
*HD2	Hold connection for 2 minutes.
*HD3	Hold connection for 3 minutes.
*HD4	Hold connection for 4 minutes.
*HD5	Hold connection for 5 minutes.

LEASED LINE BACKUP - RESTORAL OPTIONS
Type:	Configuration
Format:	AT [cmds] *REn [cmds]
Example:	AT *RE0 D555-1212<CR>
Description:	Selects what will initiate the restoral of a leased line connection.
Command	Function
*RE0	Restoral disabled.
*RE1	Modem will restore connection only when the Talk/Data button is pressed.
*RE2	Modem will restore connection when DTR signal goes high.
*RE3	Modem will restore connection when ITU-T circuit 116 goes high.
*RE4	Modem will restore connection automatically.
*RE5	Modem will enable command set when DTR signal goes high.
*RE6	Modem will enable command set when ITU-T circuit 116 goes high.

LEASED LINE BACKUP RETURN TIME
Type:	Configuration
Format:	AT [cmds] *LEn [cmds]
Example:	AT*LE1<CR>
Description:	Sets the amount of time until the modem will reconnect to the leased line connection.
Command	Function
*LE0	Modem will reconnect when the Talk/Data button is pressed.
*LE1	Modem will reconnect after 15 minutes.
*LE2	Modem will reconnect after 30 minutes.
*LE3	Modem will reconnect after 1 hour.
*LE4	Modem will reconnect after 2 hours.
*LE5	Modem will reconnect after 4 hours.

LEASED LINE BACKUP THRESHHOLD
Type:	Configuration
Format:	AT [cmds] *DIn [cmds]
Example:	AT *DI1 O<CR>
Description:	Sets the number of retrains at which the modem will initiate a leased-line backup procedure.
Command	Function
*DI0	Backup initiated after 3 retrains in 5 minutes at high-speed connection, or 6 retrains in 5 minutes for low-speed connection.
*DI1	Backup initiated after 6 retrains in 10 minutes at high-speed connection, or 12 retrains in 10 minutes for low-speed connection.
*DI2	Backup initiated after 5 retrains in 5 minutes at high-speed connection, or 10 retrains in 5 minutes for low-speed connection.
*DI3	Backup initiated after 10 retrains in 10 minutes at high-speed connection, or 20 retrains in 10 minutes for low-speed connection.

LINE TYPE
Type:	Configuration
Format:	AT [cmds] &Ln [cmds]
Example:	AT &L2 H1 DT555-1212<CR>
Description:	Selects line type.
Command	Function
&L0	Switched line.
&L1	2-wire leased line.
&L2	4-wire leased line.

LINK STORED NUMBERS
Type:	Configuration
Format:	AT [cmds] *LNm,n [cmds]
Example:	AT *LN1,2 <CR>
Description:	Links two stored phone numbers in sequence so that if one fails, the next one will be dialed. If the second number is omitted, the link from the first number will be cleared.

LOCAL SERIAL PORT SPEED
Type:	Configuration
Format:	AT [cmds] *DEn [cmds]
Example:	AT *DE16 *OS0 *SC1<CR>
Description:	Sets serial port speed.
Command	Function
*DE2	Sets 300bps speed.
*DE3	Sets 600bps speed.
*DE4	Sets 1200bps speed.
*DE5	Sets 2400bps speed.
*DE6	Sets 4800bps speed.
*DE7	Sets 7200bps speed.
*DE8	Sets 9600bps speed.
*DE9	Sets 12Kbps speed.
*DE10	Sets 14.4Kbps speed.
*DE11	Sets 16.8Kbps speed.
*DE12	Sets 19.2Kbps speed.
*DE13	Sets 21.6Kbps speed.
*DE14	Sets 24Kbps speed.
*DE15	Sets 38.4Kbps speed.
*DE16	Sets 57.6Kbps speed.
*DE17	Sets 64Kbps speed.
*DE18	Sets 72Kbps speed.
*DE19	Sets 76.8Kbps speed.
*DE20	Sets 96Kbps speed.
*DE21	Sets 115.2Kbps speed.
*DE22	Sets speed automatically.
*DE23	Sets 48Kbps speed.
*DE24	Sets 56Kbps speed.
*DE25	Sets 26.4Kbps speed.
*DE26	Sets 28.8Kbps speed.
*DE28	Sets 128Kbps speed.

LOCAL SERIAL PORT SPEED ADJUST
Type:	Configuration
Format:	AT [cmds] *OSn [cmds]
Example:	AT *DE16 *OS0 *SC 1<CR>
Description:	Sets the maximum amount to adjust the local serial port speed by.
Command	Function
*OS0	Adjust local serial port speed by no more than -1%.
*OS1	Adjust local serial port speed by no more than -2.5%.

LOCK SERIAL PORT
Type:	Configuration
Format:	AT [cmds] *SCn [cmds]
Example:	AT *DE16 *OS0 *SC1<CR>
Description:	Sets operation of serial port speed.
Command	Function
*SC0	Serial speed follows connect speed.
*SC1	Serial speed locked.

LOOPBACK TEST ON PIN 18
Type:	Configuration
Format:	AT [cmds] *LAn [cmds]
Example:	AT*LA0<CR>
Description:	Controls whether the modem will perform a local analog loopback test when pin 18 goes high.
Command	Function
*LA0	Pin 18 has no function.
*LA1	Pin 18 going high causes the modem to perform local analog loopback test.

LOOPBACK TEST ON PIN 21
Type:	Configuration
Format:	AT [cmds] *LDn [cmds]
Example:	AT*LD0<CR>
Description:	Controls whether the modem will perform a remote digital loopback test when pin 21 goes high.
Command	Function
*LD0	Pin 21 has no function.
*LD1	Pin 21 going high causes the modem to perform remote digital loopback test.

NETWORK OPTIMIZATION
Type:	Configuration
Format:	AT [cmds] *NCn [cmds]
Example:	AT *NC0<CR>
Description:	Selects options to make the modem operate more efficiently when using the network control option.
Command	Function
*NC0	Normal operation.
*NC1	Level 1 optimization; limits serial port rate to 21.6Kbps.
*NC2	Level 2 optimization; limits serial port rate to 19.2Kbps.

NRZI INTERFACE
Type:	Configuration
Format:	AT [cmds] *DFn [cmds]
Example:	AT *MF1 *DF1 *FL5<CR>
Description:	Configures DTE non return to zero interface.
Command	Function
*DF0	NRZ command and connect modes.
*DF1	NRZI command and connect modes.

PARITY
Type:	Configuration
Format:	AT [cmds] *RPn [cmds]
Example:	AT *RP0 *SM1<CR>
Description:	Sets the parity of the modem.
Command	Function
*RP0	Parity determined by V.25bis settings.
*RP1	Even parity.
*RP2	Odd parity.
*RP3	MARK parity.
*RP4	SPACE parity.

PROTOCOL
Type:	Configuration
Format:	AT [cmds] *LSn [cmds]
Example:	AT *LS1 <CR>
Description:	Selects the protocol for low-speed data calls.
Command	Function
*LS0	Bell protocols.
*LS1	ITU-T protocols.

PROTOCOL/SPEED
Type:	Configuration
Format:	AT [cmds] *MMn [cmds]
Example:	AT *MN6 *MX14 *MM11<CR>
Description:	Selects the current protocol.
Command	Function
*MM0	Selects V.32bis and below.
*MM1	Selects V.32 and below.
*MM2	Selects V.32bis and V.32.
*MM3	Selects V.32 only.
*MM4	Selects V.22bis only.
*MM5	Selects Bell 212 only.
*MM6	Selects Bell 103 only.
*MM7	Selects V.21 only.
*MM10	Selects all protocols.
*MM11	Selects V.34 only.
*MM12	Selects non-TCM V.32 only.

RECEIVE LEVEL COMPENSATION
Type:	Configuration
Format:	AT [cmds] *LCn [cmds]
Example:	AT*LC1<CR>
Description:	Allows the modem to compensate for lossy line conditions.
Command	Function
*LC0	Compensation disabled.
*LC1	Compensation enabled.