XM128 ISDN modem/telephone/ISDN Settings and Configuration

Card Type	ISDN Modem
Chip Set	Unidentified
I/O Options	25-pin serial port, ISDN interface via RJ-45 connector (U or S/T), power analog telephone line out (2)
ISDN Data Rate	128Kbps
ISDN Modulation Protocol	PPP, MLPPP, BACP, X.75, V.110, V.120
Error Correction/Compression	V.42bis
Data Bus	External

CONNECTIONS
Function	Label		Function		Label
Power		CN1		Telephone line 1		CN4
25-pin serial port		CN2		Telephone line 2		CN5
ISDN interface (RJ-45)		CN3		Power switch		SW1

DIAGNOSTIC LED(S)
LED	Color		Status		Condition
PWR	Yellow		On		Power is on
PWR	Yellow		Off		Power is off
DCH	Green		On		ISDN link on D channel is active
DCH	Green		Blinking		D channel connection is being established
DCH	Green		Off		ISDN link on D channel is inactive
B1	Green		On		Connection is established on B-channel 1
B1	Green		Off		Connection is broken on B-channel 1
B2	Green		On		Connection is established B-channel 2
B2	Green		Off		Connection is broken on B-channel 2
AA	Green		On		Automatic answer mode is enabled
AA	Green		Off		Automatic answer mode is disabled
CP	Green		On		Data compression is active on B-channel
CP	Green		Blinking		Incoming call is ringing
CP	Green		Off		Data compression is not active on B-channel
DTR	Green	On		Terminal/computer ready for operation
DTR	Green	Off		Terminal/computer not ready for operation
DSR	Green	On		Modem is ready for operations
DSR	Green	Off		Modem is not ready for operations
CTS	Green	On		Modem ready to receive data from DTE
CTS	Green	Off		Modem is not ready to receive data from DTE
RTS	Green	On		Sending device is enabled
RTS	Green	Off		Sending device is disabled
TD	Green	On		DTE is transmitting data to the modem
TD	Green	Off		DTE is not ransmitting data to the modem
RD	Green	On		DTE is receiving data from the modem
RD	Green	Off		DTE is not receiving data from to the modem
PH1	Green	On		Telephone line 1 is off-hook
PH1	Green	Off		Telephone line 1 is on-hook
PH2	Green	On		Telephone line 2 is off-hook
PH2	Green	Off		Telephone line 2 is on-hook

SUPPORTED COMMAND SET

Basic AT Commands

AT, ‘+++’, A/

A, E, L, M, Q, V

&C, &F, &Z

S Registers

S0, S1, S2, S3, S4, S5, S7, S8, S10, S12, S25

Note: See MHI Help File for full command documentation.

ANALOG PHONE PORT
Type:	Configuration
Format:	AT [cmds] &Ln [cmds]
Description:	Selects analog port during call answering
Command	Line Type
&L0	Phone port 1
&L1	Phone port 2

B-CHANNEL DATA RATE
Type:	Configuration
Format:	AT [cmds] &En [cmds]
Description:	Selects data rate on B-channel
Command		Function
&E0		64Kbps
&E1		56Kbps

BUNDLE SELECTION
Type:	Configuration
Format:	AT [cmds] &Jn [cmds]
Description:	Selects bundle options
Command	Jack Type
? &J0	Bundle connection is disabed
&J1	Bundle connection is enabled in answer mode only
&J2	Bundle connection is enabled in call mode only
&J3	Bundle connection enabled in both directions

CONFIGURATION PROFILES
Type:	Immediate
Format:	AT [cmds] &V [cmds]
Description:	Views profile settings
Command	Function
&V0	View current active settings
&V1	View profile 1
&V2	View profile 2
&V3	View profile 3
&V4	View profile 4
&V5	View factory default profiles
&V6	Views settings on phone line 1
&V7	Views settings on phone line 2

DATA COMPRESSION
Type:	Configuration
Format:	AT [cmds] &Kn [cmds]
Description:	Enables/disables V.42bis data compression in V.120/X.75 mode
Command	Function
&K00	V.42bis disabled
&K44	V.42bis enabled

DATA SET READY (DSR)
Type:	Configuration
Format:	AT [cmds] &Sn [cmds]
Description:	Selects DSR options
Command	Function
&S0	DSR forced high
&S1	DSR high only while modem is handshaking or connected

D-CHANNEL COMMUNICATION PROTOCOLS
Type:	Configuration
Format:	AT [cmds] Pn [cmds]
Description:	Selects the communication protocol for D-channel calls
Command	Protocol
? P0	Northern Telecom proprietary selection
P1	National ISDN 1 (1 SPID)
P2	National ISDN 1 (2 SPID)
P4	AT&T custom piont to point
P5	AT&T custom piont to multipoint (1 SPID)
P6	AT&T custom piont to multipoint (2 SPID)

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
D+	Second number string prefix. Used for bundling or MPPP calls
DW	Dialing resumed following dial tone detection
D,	Dialing paused for amount of time specified in S6 register
DY0	Number type unknown
DY1	International number
DY2	National number
DY3	Network specific number
DY4	Subscriber number
DY6	Abbreviated number
DZ0	Type of subaddress, NSAP with AFI=$50, IA5 characters
DZ2	Type of subaddress, user specified, IA5 characters
DN0	Numbering plan unknown
DN1	ISDN/Telephony numbering plan (CCITT E.164/E.163)
DN3	Data numbering plan (CCITT X.121)
DN8	National standard numbering plan
DN9	Private numbering plan
D/	Called pary subaddress delimiters
DA	Dials number on telephone line 1
DB	Dials number on telephone line 2
DI	Dials number for ISDN data call
DN0=n	User enters USA switches, first phone number
DN1=n	User enters USA switches, second phone number
DSn	Dial stored telephone number n. (n = 0-39)

DIALING COMMANDS CALL TYPE
Type:	Configuration
Format:	AT [cmds] &On [cmds]
Description:	Selects the call type for conventional dialing commands
Command	Mode
&O0	Analog phone line 2
&O1	ISDN mode
&O2	Analog phone line 1

DTR SIGNAL
Type:	Configuration
Format:	AT [cmds] &Dn [cmds]
Description:	Controls the behavior of the DTR signal.
Command		Function
&D0		DTR forced high.
&D1		Device enters command mode when DTR goes low.
? &D2		Device hangs up and returns to command mode on low DTR.
&D3		Device resets on low DTR.

FLOW CONTROL
Type:	Configuration
Format:	AT [cmds] &Hn [cmds]
Description:	Disables flow control options
Command	Function
&H0	Flow control disabled
? &H3	RTS to CTS flow control disabled
&H4	XON/XOFF flow control disabled

HOOK CONTROL
Type:	Immediate
Format:	AT [cmds] Hn [cmds]
Description:	Selects whether the modem is on-hook or off-hook
Command	Function
? H0	Modem commanded to go on-hook (hang-up)
H3	Phone line 1 commanded to go on-hook (hang-up)
H4	Phone line 2 commanded to go on-hook (hang-up)

ISDN 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. B must be followed by two digits.
Command	Protocol
B00	X.75 Transparent
B01	X.75 T.70
B04	BTX (Data X-J)
B10	V.110 follows DTE speed (async). V.110 determined by in-band negotiation (sync)
B13	V.110 at 2400bps
B14	V.110 at 4800bps
B15	V.110 at 9600bps
B16	V.110 at 14.4Kbps
B17	V.110 at 19.2Kbps
B18	V.110 at 38.4Kbps (sync only)
B19	V.110 at 57.6Kbps (sync only)
B20	V.120
B40	PPP async to sync conversion
B41	SLIP async to sync conversion

ON-LINE
Type:	Immediate
Format:	AT [cmds] On [cmds]
Description:	Controls on-line command (data transmission) state options.
Note: The O command must be placed at the end of the command string.
Command	Function
O0	On-line command mode with no retraining enabled

REPEAT PREVIOUS COMMAND OR CALL
Type:	Immediate
Format:	A>
Description:	Repeats previous command once or last call up to 9 times.

REPORT INFORMATION
Type:	Immediate
Format:	AT [cmds] In [cmds]
Description:	Displays information requested
Command	Function
I0	Reports product ID
I1	Reports product information & ROM checksum
I3	Reports link status
I9	Reports Microsoft PnP code

RING VOLUME
Type:	Configuration
Format:	AT [cmds] Nn [cmds]
Description:	Controls ring volume
Command	Function
N0	Audio ring disabled
N1	Low volume setting
N2	Medium volume setting
? N3	Highest volume setting

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 - 47 enabled.
X2	Busy tone detection enabled, dial tone detection disabled; result codes 0 - 6, 10 - 47 enabled
X3	Busy tone detection disabled, dial tone detection enabled; result codes 0 - 5, 7 - 47 enabled
X4	Busy and dial tone detection enabled; result codes 0 - 47 enabled.
X5	Busy and dial tone detection enabled; result codes 0 - 47 enabled.
X6	Busy and dial tone detection enabled; result codes 0 - 18, 35, 38 - 47 enabled.
X7	Busy and dial tone detection enabled; result codes 0 - 18, 35, 38 - 47 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 3
Z3	Restore setting 4
Z4	Restore factory default settings

STORE ACTIVE PROFILE
Type:	Configuration
Format:	AT [cmds] &Wn [cmds]
Description:	Writes the values for the active profile into the non-volatile RAM
Command	Function
&W0	Write the active profile to stored profile 0
&W1	Write the active profile to stored profile 1
&W2	Write the active profile to stored profile 2
&W3	Write the active profile to stored profile 3

TEST MODES
Type:	Immediate
Format:	AT [cmds] &Tn
Description:	Selects test options
Command	Function
&T9	Initiates ISDN loopback test
&T10	Initiates ISDN loopback with self diagnostic test

ADD-THRESHOLD
Type:	Configuration
Format:	AT [cmds] JAn [cmds]
Range:	0-255
Default:	48
Unit:	Kbps
Description:	Determines the add-threshold for MNPPP

B-CHANNEL NUMBER
Type:	Configuration
Format:	AT [cmds] &Zin=(phone # & subaddress)
Description:	Assigns the phone numbers for various B-channel protocols. ZI? Displays B-channel phone numbers
Command	Protocol
&ZI0	Assigns MSNs for X.75
&ZI1	Assigns MSNs for V.110
&ZI2	Assigns MSNs for V.120
&ZI3	Assigns MSNs for PPP, MPPP
&ZI4	Assigns MSNs for ISDN data, protocal auto-detect
&ZI6	Assigns the phone numbers for analog phone line 1
&ZI7	Assigns the phone numbers for analog phone line 2

BOD ADD-PERSIST (MIN)
Type:	Configuration
Format:	AT [cmds] KAMn [cmds]
Range:	0-63
Default:	0
Unit:	1min
Description:	Determines the add-persist time interval for BOD

BOD ADD-PERSIST
Type:	Configuration
Format:	AT [cmds] KAxn [cmds]
Range (n):	0-63
Default:	0
Unit (x):	S=1sec, M=1min
Description:	Determines the add-persist time interval for BOD

BOD SUB-PERSIST
Type:	Configuration
Format:	AT [cmds] KSxn [cmds]
Range (n):	0-63
Default:	0
Unit (x)::	S=1sec, M=1min
Description:	Determines the sub-persist time interval for BOD

CALL BUMPING
Type:	Configuration
Format:	AT [cmds] CEn [cmds]
Description:	Enables/disables call bumping
Command	Protocol
CE0	Call bumping disabled
CE1	Call bumping enabled

CALL RESUME
Type:	Configuration
Format:	AT [cmds] CRn [cmds]
Range:	0-3
Description:	Resumes a previously suspended call; n is the call identifier
Note:	Command for use in Europe

CALL SUSPEND
Type:	Configuration
Format:	AT [cmds] CSn [cmds]
Range:	0-3
Description:	Suspends a call; n is the call identifier
Note:	Command for use in Europe

CALLBACK
Type:	Configuration
Format:	AT [cmds] *GCn [cmds]
Description:	Enables/disables callback function
Command	Function
*GC1	Callback function disabled
*GC2	Callback function enabled

CALLBACK LOCATION
Type:	Configuration
Format:	AT [cmds] *HCn=x [cmds]
Description:	Assigns a storage location to callback phone number x
Command	Function
*HC0	Callback number stored in location 0
*HC1	Callback number stored in location 1
*HC2	Callback number stored in location 2
*HC3	Callback number stored in location 3
*HC4	Callback number stored in location 4

CALLER ID
Type:	Immediate
Format:	AT [cmds] *T [cmds]
Description:	Recalls caller ID information

CHARACTER LENGTH
Type:	Configuration
Format:	AT [cmds] *Hn [cmds]
Description:	Sets 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

CHARGE
Type:	Immediate
Format:	AT [cmds] CH? [cmds]
Description:	Displays accumulated charging unit of last call

DATA PACKET SIZE
Type:	Configuration
Format:	AT [cmds] CLn [cmds]
Range:	0-2048
Unit:	8
Description:	Determines the maximum size of user data in a packet. CL? Queries current setting

DIAL POINTER
Type:	Configuration
Format:	AT [cmds] *Dn [cmds]
Range:	0-39
Default:	0
Unit:	ASCII
Description:	Sets the default dial pionter for telephone directory location n

FIRMWARE DOWNLOAD
Type:	Configuration
Format:	AT [cmds] UPX [cmds]
Description:	Downloads firmware to the flash EPROM using X-modem protocol

LOOPBACK 4
Type:	Configuration
Format:	AT [cmds] CPn [cmds]
Description:	Enables/disables loopback 4
Command	Protocol
CP0	Loopback 4 disabled
CP1	Loopback 4 enabled

PASSWORD TABLE
Type:	Configuration
Format:	AT [cmds] *Hn [cmds]
Range:	0-39
Unit:	ASCII
Description:	Modifies user password table at location n

PREFIX NUMBER (INTERNATIONAL)
Type:	Configuration
Format:	AT [cmds] CIn [cmds]
Description:	Determines prefix number string to be added to the calling party number before indicating to the DTE international number type

PREFIX NUMBER (NATIONAL)
Type:	Configuration
Format:	AT [cmds] CNn [cmds]
Description:	Determines prefix number string to be added to the calling party number before indicating to the DTE national number type

SECURITY FUNCTIONS
Type:	Configuration
Format:	AT [cmds] *Gn [cmds]
Description:	Enables type 2 security, sets password check and callback security options
Command	Function
*G3	Type 2 security enabled with password check
*G4	Type 2 security enabled with password check and callback
*G5	Type 2 security enabled with password check and callback; remote site enters the callback number

SPID NUMBER
Type:	Configuration
Format:	AT [cmds] SPIDn=(SPID #)
Unit:	Unidentified
Description:	Sets the SPID number for USA switches
Command		Protocol
SPID0		Sets SPID number 1
SPID1		Sets SPID number 2

SUB-THRESHOLD
Type:	Configuration
Format:	AT [cmds] JSn [cmds]
Range:	0-255
Default:	32
Unit:	Kbps
Description:	Determines the sub-threshold for MNPPP

SUPERVISORY PASSWORD
Type:	Configuration
Format:	AT [cmds] *HS [cmds]
Description:	Modifies supervisory password. Dafault password is NETGEAR

VIEW CALLBACK
Type:	Immediate
Format:	AT [cmds] *VC [cmds]
Description:	Views callback number table

VIEW PASSWORD
Type:	Immediate
Format:	AT [cmds] *V [cmds]
Description:	Views password table

WRITE NUMBER
Type:	Configuration
Format:	AT [cmds] &ZOn=(phone # & subaddress)
Description:	Writes phone number to be used as the calling party number. ZO? displays setting
Command	Protocol
&ZOI	Calling party number on ISDN interface
&ZOA	Calling party number on analog phone line 1
&ZOB	Calling party number on analog phone line 2

1TR6 OUTGOING SERVICES
Type:		Register
Format		AT [cmds] S104x=n [cmds]
Description:		Determines outgoing service options.
Command	Function
x=0	PHONE 2 service
x=2	ISDN data service
x=3	PHONE 1 service

ADD-THRESHOLD FOR BOD
Type:	Register
Format:	AT [cmds] S126=n [cmds]
Range:	0-255
Unit:	Kbps
Description:	Determines the add-threshold for BOD

B-CHANNEL 1 ACCUMULATED CHARGING UNIT (MSB)
Type:	Register
Format:	AT [cmds] S120=n [cmds]
Range:	Unidentified
Unit:	Unidentified
Description:	Determine the accumulated charging unit (MSB) for B-channel 1

B-CHANNEL 1 ACCUMULATED CHARGING UNIT(LSB)
Type:	Register
Format:	AT [cmds] S121=n [cmds]
Range:	Unidentified
Unit:	Unidentified
Description:	Determine the accumulated charging unit (LSB) for B-channel 1

B-CHANNEL 2 ACCUMULATED CHARGING UNIT (MSB)
Type:	Register
Format:	AT [cmds] S122=n [cmds]
Range:	Unidentified
Unit:	Unidentified
Description:	Determine the accumulated charging unit (MSB) for B-channel 2

B-CHANNEL 2 ACCUMULATED CHARGING UNIT(LSB)
Type:	Register
Format:	AT [cmds] S123=n [cmds]
Range:	Unidentified
Unit:	Unidentified
Description:	Determine the accumulated charging unit (LSB) for B-channel 2

B-CHANNEL BUNDLING PROTOCOL SELECTION
Type:	Register
Format	AT [cmds] S100=n [cmds]
Description:	Sets B-channel bundling protocol
Command	Function
S100=0	MLP
S100=1	Cfos (European models)

BIT-MAPPED REGISTER S118
Format:		AT [cmds] S118n [cmds]
Range:		0-255
Description:		Enables/disables dial-in call; selects default B-channle speed, incoming call acceptance, and bearer service
Bit	Value		Function
0	0 1		Dial-in call enabled Dial-in call disabled
1	0		Not used
2	0 1		64Kbps ISDN B-channel speed 56Kbps ISDN B-channel speed
3	0		Not used
4	0 1		3.1KHz bearer service priority on PHONE 2 Speech bearer service priority on PHONE 2
5	0 1		3.1KHz bearer service priority on PHONE 1 Speech bearer service priority on PHONE 1
6	0 1		Global call accepted Global calls rejected if MSN is unmatched
7	0 1		Analog incoming calls enabled analog icoming calls disabled

BIT-MAPPED REGISTER S119
Format:		AT [cmds] S119n [cmds]
Range:		0-255
Description:		Enables/disables callback function, DDI function, MSN matching; controls V.110 speed
Bit	Value		Function
0	0 1		Callback function disabled Callback function enabled
1	0 1		DDI point-to-point signaling disabled DDI point-to-point signaling enabled
2	0 1		DDI point-to-multipoint signaling disabled DDI point-to-multipoint signaling enabled
3	0 1		Inbound call ignored if MSN is unmatched Inbound call accepted if MSN is unmatched
4	0 1		V.110 user rate set to 19.2Kbps if DTE speed is greater than 19.2Kbps V.110 user rate set to 38.4Kbps if DTE speed is greater than 38.4Kbps
5	0 1		Normal MSN function enabled Treats number assigned by &ZI=n as a subaddress, and matches it to the called party subaddress
7	0		Not used

BIT-MAPPED REGISTER S125
Format:		AT [cmds] S125n [cmds]
Range:		0-255
Description:		Controls sub-persist time interval
Bit	Value		Function
0	0		Not used
1-6	?		Controls sub-persist time interval; further information not available
7	0 1		Sub-persist time interval in second unit Sub-persist time interval in minute unit

BIT-MAPPED REGISTER S15
Format		AT [cmds] S23=n [cmds]
Range:		0-255
Unit:		Bit-mapped
Description:		Determines parity, stop bits, character length, and power-up profile
Bit	Value	Function
0,1	00 01 10	Parity even Parity odd Mark or No Parity
2	0 1	1stop bit 2 stop bits
4,3	00 01 10 11	10-bit character length 11-bit character length 9-bit character length 8-bit character length
7-5	00 01 10 11	Power on profile 1 Power on profile 2 Power on profile 3 Power on factory default profile

BIT-MAPPED REGISTER S21
Format		AT [cmds] S21=n [cmds]
Range:		0-255
Unit:		Bit-mapped
Description:		Enables speaker, controls DTR/DCD/DSR signals & low DTR action
Bit	Value	Function
0-2	00 01 10	Speaker always off Speaker on until carrier is detected Speaker always on
3	0 1	DSR forced high DSR normal
4	0 1	DCD forced high DCD normal
5	0 1	DCD forced high DCD normal
6-7	00 01 10 11	DTR assumed on DTR toggle causes default number to dial Hang up and return to command mode on low DTR Hang up and reset to profile 0 on low DTR

BIT-MAPPED REGISTER S23
Format:		AT [cmds] S23=n [cmds]
Range:		0-255
Description:		Select command echo, automode and extended result code format.
Bit	Value		Function
0	0 1		Command echo enabled Command echo disabled
1	0		Not used
2	00 01		Insertion not allowed during phone call Insertion allowed during phone call
3-5	000 001 010 011 100		Busy and dial tone detection disabled; result codes 0 - 4 enabled. Busy and dial tone detection disabled; result codes 0 - 5, 10 - 47 enabled. Busy tone detection enabled, dial tone detection disabled; result codes 0 - 6, 10 - 47 enabled. Busy tone detection disabled, dial tone detection enabled; result codes 0 - 5, 7 - 47 enabled. Busy and dial tone detection enabled; result codes 0 - 47 enabled.
6	0 1		Result codes displayed in numeric format Result codes displayed in verbose format
7	0		Not used

BIT-MAPPED REGISTER S24
Format:		AT [cmds] S24=n [cmds]
Range:		0-255
Description:		Selects ring volume, speaker control (S21 bits 1-2) ignore function, and speaker volume
Bit	Value		Function
0,1	00 01 11		Ring volume at minimum Ring volume increased by 1 decimal Ring volume increased by 2 decimals
2	0 1		Ignore S21 bits 1-2 speaker enable when phone 1 keypad is dialed Do not ignore S21 bits 1-2 speaker enable when phone 1 keypad is dialed
3	0 1		Ignore S21 bits 1-2 speaker enable when phone 2 keypad is dialed Do not ignore S21 bits 1-2 speaker enable when phone 2 keypad is dialed
5,4	0		Speaker volume control in increments of 16
6,7	0		Not used

BIT-MAPPED REGISTER S35
Format:		AT [cmds] S35=n [cmds]
Range:		0-255
Description:		Enables default dail, extended numeric result codes
Bit	Value		Function
0-3	0		Not used
4	0 1		Do not dial default number when Data/Voice is pressed Dials default number when Data/Voice is pressed
6-5	0		Not used
7	0 1		Extended numeric result codes in error correction mode are disabled Extended numeric result codes in error correction mode are enabled

BIT-MAPPED REGISTER S38
Format:		AT [cmds] S38=n [cmds]
Range:		0-255
Description:		Enables repeat dialing, DCD toggle
Bit	Value		Function
0	0 1		Repeatedly dials default number Does not repeatedly dial default number
1	0		Not used
3	0 1		DCD toggle does not follow UNIX standard DCD toggle follows UNIX standard. DCD high before connect message is sent, DCD off after last DCE response is sent
4-7	0		Not used

BIT-MAPPED REGISTER S40
Format:		AT [cmds] S40=n [cmds]
Range:		0-255
Description:		Enables result code display in answer mode
Bit	Value		Function
0	0		Not used
1	0 1		Result code display in answer mode enabled Result code display in answer mode disabled
2-7	0		Not used

BIT-MAPPED REGISTER S41
Format:		AT [cmds] S41=n [cmds]
Range:		0-255
Description:		Enables CCITT signals 140 & 141 on EIA-232D interface
Bit	Value		Function
0-2	0		Not used
3	0 1		CCITT signals 140 & 141 on EIA-232D interface disabled CCITT signals 140 & 141 on EIA-232D interface enabled
4-7	0		Not used

BIT-MAPPED REGISTER S42
Format:		AT [cmds] S42=n [cmds]
Range:		0-255
Description:		Controls escape sequence Data/Voice button, and <RINGING> result code
Bit	Value		Function
0	0		Not used
3	0 1		Escape code sequence in answer mode enabled Escape code sequence in answer mode disabled
4	0		Not used
5	0 1		Voice/Data button enabled Voice/Data button disabled
6	0 1		Ringing result code enabled Ringing result code disabled
7	0		Not used

BIT-MAPPED REGISTER S44
Format:		AT [cmds] S44=n [cmds]
Range:		0-255
Description:		Controls escape sequence Data/Voice button, and <RINGING> result code
Bit	Value		Function
0	0		Not used
3	0 1		ATDSn does not initiate auto-dial if the stored numbers cinsecutively until connection is made ATDSn does not initiates auto-dial if the stored numbers cinsecutively until connection is made
4	0 1		DSR does not follow DTR DSR follows DTR
5-7	0		Not used

BIT-MAPPED REGISTER S80
Format:		AT [cmds] S80=n [cmds]
Range:		0-255
Description:		Controls sending of low-layer compatibility information
Bit	Value		Function
0-3	0		Not used
4	0 1		Does not send low-layer compatibility information for PHONE 2 Send low-layer compatibility information for PHONE 2
5	0		Not used
6	0 1		Does not send low-layer compatibility information for ISDN call Send low-layer compatibility informatin for ISDN call
7	0 1		Does not send low-layer compatibility information for PHONE 1 Send low-layer compatibility information for PHONE 1

BIT-MAPPED REGISTER S83
Format:		AT [cmds] S83=n [cmds]
Range:		0-255
Description:		Controls loopback and dial commands
Bit	Value		Function
0	0 1		Loopback 4 test disabled Lopback 4 test enabled
2	0 1		ISDN without V.42bis enabled ISDN with 42bis enabled
3	0		Not used
4-5	00 01 10		ATD, ATDP, and ATDT commands are mapped to ATDM ATD, ATDP, and ATDT commands are mapped to ATDI ATD, ATDP, and ATDT commands are mapped to ATDB
6-7	0		Not used

BIT-MAPPED REGISTER S84
Format:		AT [cmds] S84=n [cmds]
Range:		0-255
Description:		Controls S-register display format, caller ID, and phone priority
Bit	Value		Function
0-2	0		Not used
3	0 1		S-register not displayed in hexidecimal format S-register displayed in hexidecimal format
4	0 1		Indicates caller ID after first ring message Caller ID disabled
5	0 1		PHONE 1 given call priority PHONE 2 given call priority
6-7	0		Not used

BIT-MAPPED REGISTER S85
Format:		AT [cmds] S85n [cmds]
Range:		0-255
Description:		Controls DCA function, add-persist time interval
Bit	Value		Function
0	0 1		DCA function enabled DCA function disabled
1-6	?		Controls add-persist time interval; further information not available
7	0 1		Add-persist time interval in secondits Add-persist time interval in minute unite

BIT-MAPPED REGISTER S87
Format:		AT [cmds] S87n [cmds]
Range:		0-255
Description:		Enables/disables bundle connection
Bit	Value		Function
0-4	0		Not used
5,6	00 01 11 10		Bundle mode connection disabled Bundle connection enabled in answer mode only Bundle connection enabled in call mode only Bundle connection enabled in both directions
7	0		Not used

BIT-MAPPED REGISTER S89
Format:		AT [cmds] S89n [cmds]
Range:		0-255
Description:		Enables/disables metering pulse
Bit	Value		Function
0-4	0		Not used
5	0 1		Metering pulse disabled on PHONE 2 Metering pulse enabled on PHONE 2
6	0 1		Metering pulse disabled on PHONE 1 Metering pulse enabled on PHONE 1
7	0		Not used

D-CHANNEL PROTOCOL SELECTION
Type:	Register
Format	AT [cmds] S86=n [cmds]
Description:	Sets the maximum allowable 56K downstream rate attempted during handshake process.
Command	Function
S86=0	Northern telecom proprietary ISDN
S86=1	National ISDN 1
S86=2	National ISDN 2
S86=3	Reserved
S86=4	AT&T proprietary point-to-piont
S86=5	AT&T proprietary point-to-multipoint
S86=6	AT&T custom point-to-multipoint