NT8D09 Analog Message Waiting Line card Page 537 of 894
Circuit Card Description and Installation
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
interdigital time 40 ms
speed 12.5 digits/s
Table 172
NT8D09 Analog Message Waiting Line card application and
compatibility (Part 2 of 2) (Continued)
Equipment Specifications