Nortel Networks 553-3001-211 manual NT8D09 Analog Message Waiting Line card Page 537

NT8D09 Analog Message Waiting Line card Page 537 of 894

Table 172

NT8D09 Analog Message Waiting Line card application and compatibility (Part 2 of 2) (Continued)

Equipment	Specifications
interdigital time	40 ms
speed	12.5 digits/s

Physical description

The circuitry is mounted on a 31.75 cm. by 25.40 cm (12.5 in. by 10 in.) printed circuit board.

The NT8D09 Analog Message Waiting Line card circuits connects to the backplane through a 160-pin connector. The backplane is cabled to a connector in the bottom of the cabinet which is cabled to the cross-connect terminal (Main Distribution Frame) through 25-pair cables. Station apparatus then connects to the card at the cross-connect terminal.

The faceplate of the NT8D09 Analog Message Waiting Line card is equipped with a red LED which lights when the card is disabled (see Figure 106 on page 538. At power-up, the LED flashes as the analog line card runs a self-test. If the test completes successfully, the card is automatically enabled (if it is configured in software) and the LED goes out.

Functional description

The NT8D09 Analog Message Waiting Line card contains a microprocessor that provides the following functions:

•self-identification

•self-test

•control of card operation

•status report to the controller

•maintenance diagnostics

Circuit Card Description and Installation