Nortel Networks 553-3001-211 manual DEM DTE PRM OFF DTR OFF HOT on

Page 434 of 894 NT7D16 Data Access card

Mode 1

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.

Configuring modems for mode 1

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:

DEM DTE PRM OFF DTR OFF HOT ON

Hayes 1200 cannot be used in this mode when the default parameters are selected (see mode 3).

553-3001-211 Standard 2.00 September 2004