Nortel Networks 553-3001-211 manual DAC to Gateway connectivity

Page 438 of 894 NT7D16 Data Access card

Figure 88

DAC to Gateway connectivity

DAC (DTE)

pin 2 pin 3

(not required) pin 5 pin 6 pin 7 pin 8 pin 20

(not required) pin 22

RS- 232 leads

>>>

<<<

<<<

<<<

<<<

>>>

<<<

Gateway (DCE)

TX

RX

CTS

DSR

GND

DCD

DTR

RI

553-5217

Mode 4

This mode should be selected when the DAC is connected to a gateway for inbound and outbound operation. The characteristics of the gateways to be used with this mode are:

Auto-answer capability This feature is required when the gateway is used for inbound operation. It allows the gateway to drive the DCD lead ON when the inbound data call is pending. In addition, the gateway should auto-answer when the DTR lead is ON.

Dynamic control of DCD This feature must be supported by all gateways to be connected to the DAC. It allows the gateway to drive the DCD lead ON when the data call is established, and OFF when the data call is disconnected.

In the inbound operation, the DAC drives the DTR lead OFF until the gateway drives the DCD lead ON. Then, the DAC drives DTR ON and makes that unit busy for any outbound calls. After that, the user of the gateway may enter the proper commands to establish a local data call to any DM.

553-3001-211 Standard 2.00 September 2004