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452 NT7D16 Data Access card
Mode of
operation Interface application Comments
When terminal receives RI ON, it should respond by
turning DTR ON.
DAC answers when DTR goes ON and the local DM
user is now transparently linked to the terminal.
Terminal originating an outgoing data call:
DAC drives DSR, DCD, and CTS ON in the idle state.
Terminal turns DTR ON to initiate the connection.
DAC prepares to receive <CR> for autobaud.
Terminal sends <CR> followed by other commands
for establishing a data call (the DAC echoes all
commands).
Call disconnection (DAC):
If the local DM user releases the call, the DAC turns
DSR, DCD, and CTS OFF for 0.2 second and then
ON.
Call disconnection (terminal):
Terminal toggles DTR from ON to OFF (DTR must be
OFF for 100 ms or more). The DAC turns DSR, DCD,
and CTS OFF for 0.2 second and then ON.
Terminal sends a long break or three short breaks.
The DAC turns DSR, DCD, and CTS OFF for 0.2
second and then ON.
Mode 13 Hotline call origination
Hotline originated by terminal:
DAC drives DSR, DCD, and CTS ON in the idle state.
Terminal toggles DTR from OFF to ON to initiate
Hotline call.
DAC responds by trying to establish a Hotline call to
a specific DM (Autodial).
If 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 terminal keeps
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 01.04 Standard
Release 5.0 23 May 2008
Copyright © 2003-2008, Nortel Networks
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