Nortel Networks 553-3001-211 manual NT7D16 Data Access card Page 449

NT7D16 Data Access card Page 449 of 894

Note: If AUTB is set to ON, the BAUD parameter is not prompted. If AUTB is set to OFF, you may select a fixed baud rate in response to the prompt BAUD.

When the DAC receives a call, it adapts to the caller’s baud rate.

See Table 153 for connect and disconnect protocol.

Table 153

Connect and disconnect protocol (Part 1 of 12)

Mode of
operation Interface application	Comments

Mode 0 Inbound and Outbound modem pools

For inbound modem pools, most dumb modems may be used.

For outbound modem pools, only smart modems (auto-dialer) may be used.

Outbound modem pooling:

Modem sends ring/no ring cycle (2 seconds ON, 4 seconds OFF) to initiate connection.

DAC responds by driving DTR ON within the first ring cycle.

Modem responds by answering the incoming call and driving DCD ON within 35 seconds.

If modem does not drive DCD ON within 35 seconds, the DAC drops DTR and goes idle.

Remote DTE sends <CR> to the DAC. The DAC autobauds and sends initial prompt.

Circuit Card Description and Installation