Page 430 of 894 NT7D16 Data Access card

Figure 86

DAC to modem connectivity

DAC (DTE)

pin 2 pin 3 (not required) pin 5 pin 6 pin 7 pin 8

pin 20 pin 22

RS- 232 leads

>>>

<<<

<<<

<<<

<<<

>>>

<<<

Modem (DCE)

TX

RX

CTS

DSR

GND

DCD

DTR

RI

553-5215

Mode 0

This mode should be selected when the DAC is connected to a modem, except Hayes-1200, for inbound and outbound modem pooling (see modes 2 and 3 for Hayes-1200 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).

553-3001-211 Standard 2.00 September 2004

Page 430
Image 430
Nortel Networks 553-3001-211 manual Mode, DAC to modem connectivity