IMPACT (3C871, 3C876) modem/telephone/ISDN Settings and Configuration

Card Type	ISDN TA
I/O Options	Analog adapter (optional)
Chipset	Unidentified
Error Correction/Compression	STAC
ISDN Transfer Rate	56Kbps x 2/64Kbps x 2
ISDN Protocol	V.120, PPP
Switch Type	5ESS, DMS100, EWSD, NI-1
Data Bus	Serial

CONNECTIONS
Function	Label		Function		Label
ISDN interface		CN1		Serial port		CN4
Analog adapter		CN2		AC power in		CN5
Serial port		CN3		Power switch		SW1
Note: CN2 may not be present on all models.

DIAGNOSTIC LED(S)
LED	Color	Status	Condition
B2	Green	On	Data call connected on B2 channel
B2	Yellow	On	Voice call connected on B2 channel
B2	Green	Blinking	TA is dialing data call on B2 channel
B2	Yellow	Blinking	TA is dialing voice call on B2 channel
B2	N/A	Off	B2 channel is not connected
B1	Green	On	Data call connected on B1 channel
B1	Yellow	On	Voice call connected on B1 channel
B1	Green	Blinking	TA is dialing data call on B1 channel
B1	Yellow	Blinking	TA is dialing voice call on B1 channel
B1	N/A	Off	B1 channel is not connected

DIAGNOSTIC LED(S) (CON'T)
LED	Color	Status	Condition
D	Yellow	On	Signal is not synchronized or ISDN is not connected
D	Yellow	Blinking	Signal is synchronized but D-channel protocols not established
D	Yellow	Off	Signal is synchronized
TEST	Yellow	On	TA failed last test
TEST	Yellow	Blinking	TA is executing test
TEST	Yellow	Off	TA is not executing test
POWER	Yellow	On	Power is on
POWER	Yellow	Off	Power is off

SUPPORTED STANDARD COMMANDS

Basic AT Commands

+++, A/

A, D, E, H, O, V, Z

&D, &F, &W

Extended AT Commands

\Q, \T

S-Registers

S0

Note: See MHI help file for complete information.

CALL TYPE
Type:	Register
Format:	AT [cmds] S61=n [cmds]
Description:	Selects the type of call the ISDN will make. This register has no function on these models.
Command	Function
í S61=0	TA will dial according to dial modifiers.
S61=2	TA will place ISDN call.

CALLER ID - DATA
Type:	Register (read-only)
Format:	AT [cmds] S66? [cmds]
Description:	Displays the Caller ID information for data calls.

CALLER ID - VOICE
Type:	Register (read-only)
Format:	AT [cmds] S65? [cmds]
Description:	Displays the Caller ID information for voice calls.

DCD SIGNAL
Type:	Configuration
Format:	AT [cmds] &Cn [cmds]
Description:	Controls the behaviour of the DCD signal.
Command	Function
í &C0	DCD forced high.
&C1	DCD forced high after carrier signal is detected.
&C2	DCD forced high except at disconnect.

DISPLAY FIRMWARE REViSION
Type:	Immediate
Format:	AT [cmds] %V [cmds]
Description:	Displays the TA's firmware revision.

DISPLAY INFORMATION
Type:	Immediate
Format:	AT [cmds] In [cmds]
Description:	Displays information requested about the TA.
Command	Function
I0	Displays product identification code.
I1	Displays ROM checksum.
I4	Displays numeric product identification code, precomputed checksum value, firmware revision, model name, interface type, country code, and data pump model.

DISPLAY MODIFIED COMMANDS
Type:	Immediate
Format:	AT [cmds] \S [cmds]
Description:	Displays the settings of all commands that have been modified.

DISPLAY REGISTERS
Type:	Immediate
Format:	AT [cmds] %R [cmds]
Description:	Displays the settings of all status registers.

DYNAMIC BANDWIDTH ALLOCATION
Type:	Register
Format:	AT [cmds] S70=n [cmds]
Description:	Selects whether dynamic bandwidth allocation will be used to allow simultaneous data and voice calls.
Command	Function
S70=0	Dynamic bandwidth allocation disabled.
í S70=1	Dynamic bandwidth allocation enabled.

ENDPOINT DISCRIMINATOR
Type:	Register
Format:	AT [cmds] S83=nnnn [cmds]
Description:	Sets the endpoint discriminator address for multipoint PPP systems. Up to twenty numbers may be specified.

ENDPOINT DISCRIMINATOR CLASS
Type:	Configuration
Format:	AT [cmds] S82=n [cmds]
Description:	Sets the endpoint discriminator class for multipoint PPP systems.
Command	Function
S82=1	User-defined address.
S82=2	IP address.
S82=3	802.1 MAC address.
S82=4	PPP magic number block.
í S82=5	Public Switched Network Directory number.

LINE SPEED
Type:	Register
Format:	AT [cmds] S60=n [cmds]
Description:	Selects the line speed that the TA will attempt to connect at.
Command	Function
í S60=56	TA will attempt to connect at 56Kbps.
S60=64	TA will attempt to connect at 64Kbps.

LOCAL SERIAL PORT SPEED
Type:	Configuration
Format:	AT [cmds] $Bn [cmds]
Description:	Sets the speed that the TA will communicate with the DTE.
Command	Function
í $B0	Auto-detects current serial port speed.
$B1200	Sets the serial port to 1200bps.
$B2400	Sets the serial port to 2400bps.
$B4800	Sets the serial port to 4800bps.
$B9600	Sets the serial port to 9600bps.
$B19200	Sets the serial port to 19.2Kbps.
$B38400	Sets the serial port to 38.4Kbps.
$B57600	Sets the serial port to 57.6Kbps.
$B115200	Sets the serial port to 115.2Kbps.

MULTILINK PPP
Type:	Register
Format:	AT [cmds] S80=n [cmds]
Description:	Selects whether the TA will use Multilink PPP.
Command	Function
S80=0	Multilink PPP disabled.
í S80=1	Multilink PPP enabled.

MULTILINK PPP - SECOND PHONE NUMBER
Type:	Register
Format:	AT [cmds] S81=<#> [cmds]
Description:	Sets the second phone number to be dialed when attempting to connect with multilink PPP. If this register is left blank then the number given with the D command will also be dialed for the second number.

PHONE NUMBER 1
Type:	Register
Format:	AT [cmds] S51=<#> [cmds]
Description:	Sets the TA’s first phone number.

PHONE NUMBER 2
Type:	Register
Format:	AT [cmds] S53=<#> [cmds]
Description:	Sets the TA’s second phone number.

PROTOCOL - B-CHANNEL
Type:	Register
Format:	AT [cmds] S71=n [cmds]
Description:	Selects the protocol the TA will use on the B channels.
Command	Function
í S71=0	Auto-select common protocol.
S71=1	TA will use PPP conversion.
S71=2	TA will use V.120.

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	Result code sending enabled on originate mode only.

SERVICE PROFILE IDENTIFIER 1
Type:	Register
Format:	AT [cmds] S52=<#> [cmds]
Description:	Sets the TA’s first SPID.

SERVICE PROFILE IDENTIFIER 2
Type:	Register
Format:	AT [cmds] S54=<#> [cmds]
Description:	Sets the TA’s second SPID.

SWITCH TYPE
Type:	Register
Format:	AT [cmds] S50=n [cmds]
Description:	Selects the type of IDSN switch the TA is connected to.
Command	Function
1	AT&T 5ESS custom switch type.
í 3	NI-1/AT&T 5ESS switch type.
6	NI-1/National Telecom NI-1 or Siemens EWSD switch type.

TERMINAL ENDPOINT IDENTIFIER 1
Type:	Register (read-only)
Format:	AT [cmds] S55? [cmds]
Description:	Displays the first TEI assigned by the ISDN switch. A value of 255 indicated that the switch did not assign a TEI.

TERMINAL ENDPOINT IDENTIFIER 1 STATUS
Type:	Register (read-only)
Format:	AT [cmds] S57? [cmds]
Description:	Returns a value indicating the status of the first TEI.
Value	Meaning
0	TA has not attempted to initialize with SPID 1.
1	TA succeeded in initializing with SPID 1.
2	TA failed in initializing with SPID 1.

TERMINAL ENDPOINT IDENTIFIER 2
Type:	Register (read-only)
Format:	AT [cmds] S56? [cmds]
Description:	Displays the second TEI assigned by the ISDN switch. A value of 255 indicated that the switch did not assign a TEI.

TERMINAL ENDPOINT IDENTIFIER 2 STATUS
Type:	Register (read-only)
Format:	AT [cmds] S58? [cmds]
Description:	Returns a value indicating the status of the second TEI.
Value	Meaning
0	TA has not attempted to initialize with SPID 2.
1	TA succeeded in initializing with SPID 2.
2	TA failed in initializing with SPID 2.

U INTERFACE STATUS
Type:	Register (read-only)
Format:	AT [cmds] S59? [cmds]
Description:	Returns a value indicating the status of the U interface.
Command	Function
0	U interface is not synchronized.
1	U interface is synchronized.

V.120 FRAME TYPE
Type:	Register
Format:	AT [cmds] S73=n [cmds]
Description:	Selects the frame type that the TA will use when in V.120 mode.
Command	Function
í S73=0	TA will use I frames.
S73=1	TA will use UI frames.

V.120 MAXIMUM FRAME SIZE
Type:	Register
Format:	AT [cmds] S74=n [cmds]
Default:	256
Range:	240 - 256
Unit:	1 byte
Description:	Selects the maximum frame size used for V.120 mode.
Note:	Adtran ISDN uses a maximum frame size of 253 bytes.