Nortel Networks Circuit Card 311 User Manual

Page 449

Operating modes

449

Mode of
operation

Interface application

Comments

Mode 6

Inbound and Outbound
Gateway access (with forced
DTR)

Inbound and Outbound Gateway protocol:

The DAC operation is identical to mode 4 except that
DTR is always forced ON (except during disconnect).
The establishment of the outbound call does not
require DCD to be driven ON by the Gateway.

Call disconnection:

Disconnection is identical to mode 4 except that when
a call is released, the DAC turns DTR OFF for 0.2
second and then ON. DTR stays ON until the next
call release.

Mode 7

Inbound Hotline Gateway
access (with forced DTR)

Inbound Hotline Gateway protocol:

The DAC operation is identical to mode 5 except that
DTR is always forced ON (except during disconnect).

Call disconnection:

Disconnection is identical to mode 6.

Mode 8

Host access for call
origination and answering

Host answering an incoming data call:

Local DM user dials the access number to initiate the
connection.

DAC responds by driving RI ON for 2 seconds and
OFF for 4 seconds until the Host answers by turning
DTR ON. (If the Host always drives DTR ON, the DAC
immediately answers the call without driving RI ON.)

When Host receives RI ON, it should respond by
turning DTR ON.

DAC answers when it receives DTR ON.

DAC turns DSR, DCD, and CTS ON when the call is
completely established. The local DM user is now
transparently linked to the Host.

Host originating a data call:

Host turns DTR ON to initiate the connection.

Nortel Communication Server 1000

Circuit Card Reference

NN43001-311

01.04

Standard

Release 5.0

23 May 2008