Nortel Networks Circuit Card 311 - Manual (Page 447)

Operating modes 447
Mode of
operation
Interface application Comments
—The DAC ignores RI and DCD for about 2 seconds
after releasing a call. This avoids problems with the
Hayes 1200 modem.
Mode 3 Inbound Hotline modem
pools (with forced DTR)
Use this mode with Hayes
1200 modem.
Inbound Hotline modem pooling:
The DAC operation is identical to mode 1 except that
DTR is always forced ON (except during disconnect).
Call disconnection:
Disconnection is identical to mode 2.
Mode 4 Inbound and Outbound
Gateway access Inbound Gateway connection protocol:
Gateway raises DCD to initiate connection.
DAC responds by driving DTR ON.
Gateway does not need to turn DSR ON. However,
toggling DSR or DCD from ON to OFF causes the
DAC to disconnect the call.
Gateway user sends <CR> to the DAC.
DAC autobauds and sends the initial prompt to the
Gateway.
Outbound Gateway connection protocol:
Local DM user calls the DAC that is connected to a
Gateway.
DAC answers the data call and drives DTR ON.
Gateway receives DTR and prepares to receive
commands.
Local DM user is now transparently connected to the
Gateway.
Gateway is expected to drive DCD ON within 35
seconds. If the Gateway fails to do so, the DAC drops
DTR and the call.
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 01.04 Standard
Release 5.0 23 May 2008
Copyright © 2003-2008, Nortel Networks
.