Nortel Networks Circuit Card User Manual

 NT7D16 Data Access card

This mode should be selected when the DAC is connected to an auto-answer 
modem for inbound Hotline operation. In this mode, the DAC automatically 
executes Hotline operation when RI is driven ON by the modem. The modem 
used should have the following features:

Auto-answer capability This feature is required when the modem is used for 
inbound modem pooling. It allows the modem to drive the RI lead ON when 
ringing is present at its tip and ring. In addition, the modem should 
auto-answer after the first ringing cycle if the DTR lead is ON (most modems 
support this feature).

Dynamic control of DCD This feature must be supported by all modems to 
be connected to the DAC. It allows the modem to drive the DCD lead ON 
when the carrier is detected and OFF when the carrier is absent (most modems 
support this feature).

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.

Most dumb modems can be configured for this mode. The modem must be 
able to auto-answer and have 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).