Nortel Networks Circuit Card 311 User Manual

Page 451

Operating modes

451

Mode of
operation

Interface application

Comments

Disconnection is identical to mode 8.

Mode 10

Host access for call
origination and answering
(with forced DTR)

Host access for call origination and answering:

The DAC operation is identical to mode 8 except
DTR is always considered ON, even when the Host
is driving DTR OFF.

Call disconnection:

DAC drops DSR, DCD, and CTS if the local DM user
releases the call. The Host should then drop the call.

DAC drops DSR, DCD, and CTS if the Host sends a
long break or three short breaks. The Host should
then drop the call.

Mode 11

Hotline call origination
(Virtual Leased Line)

Hotline origination by Host (continuous Hotline
mode):

The DAC operation is similar to mode 9 except the
Host initiates the Hotline call by driving DTR ON.
However, if the DM is busy or not answering, the
DAC continuously tries to originate Hotline calls once
every 40 seconds (as long as DTR stays ON) until the
called DM answers the call.

Call disconnection:

Disconnection is identical to mode 8.

Mode 12

Terminal access for call
origination and answering

Terminal answering an incoming data call:

DAC drives DSR, DCD, and CTS ON in the idle state.

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 terminal answers by
turning DTR ON (if the terminal always drive DTR
ON, the DAC immediately answers the call without
driving RI ON).

Nortel Communication Server 1000

Circuit Card Reference

NN43001-311

01.04

Standard

Release 5.0

23 May 2008