User guide

Chapter 5 - AT Commands

!D3=n SAPI-0 Data TEI

Unit: Decimal ASCII code

Values: n=0-63 (Sets the TEI to a fixed value from 0 through 63)

n=240 (Sets the data channel for dynamic TEI negotiation)

n=241 (Disables TEI)

Default: !D3=240 (Auto TEI)

Use the !D3=n command to set the terminal endpoint identifier (TEI) for the data channel. A

TEI is a number used by the central office switch to uniquely identify each device that is

connected to the network. When it uses dynamic TEI assignments (auto TEI), the central office

switch assigns a TEI each time the TA connects to the network. However, the ISDN service

provider may assign a fixed TEI at subscription time, in which case you must configure the TA

with the fixed TEI number. You can also use the !D3=n command to disable the data channel,

which may be useful when multiple TAs are attached to a network terminator bus.

AT!D3?<CR> may be used to review the Data TEI or AT!L<CR> may be used to review all

TEI numbers. The @CONFIG configuration menu can also be used to set and review the Data

TEI.

*!D3=n SAPI-0 Modem TEI

Unit: Decimal ASCII code

Values: n=0-63 (Sets the TEI to a fixed value

from 0 through 63)

n=240 (Sets the modem channel for

dynamic TEI negotiation)

n=241 (Disables TEI)

Default: *!D3=240 (Auto TEI)

Use the *!D3=n command to set the TA's terminal endpoint identifier (TEI) for the modem

channel. A TEI is a number used by the central office switch to uniquely identify each device

that is connected to the network. When it uses dynamic TEI assignments (auto TEI), the

central office switch assigns a TEI each time the TA connects to the network. However, the

ISDN service provider may assign a fixed TEI at subscription time, in which case you must

configure the TA with the fixed TEI number. You can also use the *!D3=n command to disable

the modem channel, which may be useful when multiple TAs are attached to a network

terminator bus. AT*!D3?<CR> may be used to review the Modem TEI or AT!L<CR> may be

used to review all TEI numbers. The @CONFIG configuration menu can also be used to set

and review the Modem TEI.

!L Display Network Configuration

Values: n/a

Default: n/a

Displays the current DN, SPID, TEI, Data protocol, and switch type.

!L Displays the current network configuration