Nortel Networks Circuit Card 311 - Manual (Page 433)

Operating modes 433
The baud rate of the Hotline call is determined by switches 6 and 8, and the
system should be programmed to allow inbound modem calls only.
Configuring modems for mode 1
Most dumb modems can be configured for this mode. The modem must be
able to auto-answer and use dynamic control of DCD as described in mode
0. Smart modems can also be used if set to the dumb mode of operation.
Hayes 2400, Bizcomp 1200, and MULTI MODEM 224E can be used when
set up as follows:
• For Hayes 2400, the dumb-mode-strap should be moved to the
dumb-position (see Hayes manual).
• For Bizcomp 1200 modem, set the following parameters in LD11:
DEMDTE
PRMOFF
DTROFF
HOTON
Hayes 1200 cannot be used in this mode when the default parameters are
selected (see mode 3).
Programing DAC for mode 1 in service change LD11
The DAC must be configured as R232 (the Autodial feature key is used for
this mode). The DAC must not be configured as an Asynchronous Data
Module (ADM) trunk.
Mode 2
This mode should be selected when the DAC is connected to a Hayes-1200
modem for inbound and outbound modem pooling. This mode is created
specially to resolve some problems that were encountered with this modem,
namely, the auto-reset implementation. When this modem is operating in
the auto-reset mode, it drives both RI and DCD ON as long as DTR is OFF.
This problem was resolved by driving DTR ON in the idle state, and OFF for
0.2 seconds, and then ON when an established call is dropped. The DAC
also ignores the status of RI and DCD for approximately 2 seconds after a
call is released to avoid false inbound call initiation.
Configuring Hayes 1200 for mode 2
To configure this modem, set the following parameters in LD11:
DEMDTE
PRMOFF
DTRON
HOTOFF
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 01.04 Standard
Release 5.0 23 May 2008
Copyright © 2003-2008, Nortel Networks
.