Nortel Networks Circuit Card 311 User Manual

Page 431

Operating modes

431

Auto-reset capability This feature is required when the modem is used
for outbound modem pooling. The modem should execute auto-reset
when the DTR lead goes OFF. As a result, the modem must reset all its
internal parameters to the default values. This feature prevents the users
of the modem pool from modifying the modem’s default parameters to
inappropriate values.

Configuring modems for mode 0

To configure Hayes modem 2400, enter the following commands:

AT&D2&W
ATVl&W
ATQ&W
ATEl&W
ATSO= 1&W
AT&Cl&Sl&W
AT&J&W
ATB1&W
AT&D3&W

Since the default parameters are programmable using commands, there is
no guarantee that users cannot change them.

To configure Bizcomp 1200 modem, set the following parameters in LD11:

DEMDTE
PRMOFF
DTROFF
HOTOFF

•

To configure MULTI MODEM 224E modem, set the configuration
switches as follows:

switches 3 and 8 to DOWN position

•

all other switches to UP position. Switch 7 should be UP when using
RJ-11 jack.

Programing DAC for mode 0 in service change LD11

When used for inbound or outbound Modem Pool only, the DAC can be
configured as R232 in LD11. When used for both inbound and outbound
Modem Pool, the DAC must be configured as R232; station hunting for
the outbound modem access should be in the opposite direction to the
500/2500 station hunting for the inbound modem access. See

Figure 109

"DAC to Modem Pool connectivity" (page 432)

for more details.

Note: If Call Detail Recording (CDR) is required, use separate outbound
and inbound Modem Pools.

Nortel Communication Server 1000

Circuit Card Reference

NN43001-311

01.04

Standard

Release 5.0

23 May 2008