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450 NT7D16 Data Access card
Mode of
operation Interface application Comments
DAC prepares to receive <CR> for autobaud.
Host sends <CR> followed by other commands for
establishing a data call (the DAC does not echo a
command, nor does it send any prompt to the Host
(blind dialing).
When the data call is completely established, the
DAC turns DSR, DCD, and CTS ON as long as the
call is connected.
Call disconnect ion (DAC):
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.
Call disconnection (Host):
The Host toggles DTR from ON to OFF (DTR must
be OFF for 100 ms or more). The DAC drops DSR,
DCD, and CTS and disconnects the local call.
Mode 9 Hotline call origination
Hotline originated by Host (Inbound):
Host toggles DTR from OFF to ON to initiate the
Hotline call.
DAC responds by trying to establish a Hotline call to
a specific Data Module (Autodial).
3When Data Module answers, then and only then,
the DAC turns DSR, DCD, and CTS ON (the DAC
does not send any prompts to the Host). If the Data
Module is busy or not responding, the DAC requires
another transition of DTR from OFF to ON to initiate
another Hotline call. If the Host keeps DTR ON, the
DAC does not try to establish another Hotline call,
unless the Host sends a <CR> while DTR is ON.
Call disconnection:
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 01.04 Standard
Release 5.0 23 May 2008
Copyright © 2003-2008, Nortel Networks
.