Functional Description - Nortel Circuit Card 311 Reference

The faceplate of the NT8D09 Analog Message Waiting Line Card is
equipped with a red LED which lights when the card is disabled. 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:
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The NT8D09 Analog Message Waiting Line card also provides:
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Copyright © 2003-2008, Nortel Networks
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self-identification
self-test
control of card operation
status report to the controller
maintenance diagnostics
600 ohms balanced terminating impedance
analog-to-digital and digital-to-analog conversion of transmission and
reception signals for 16 audio phone lines
transmission and reception of Scan and Signaling Device (SSD)
signaling messages over a DS-30X signaling channel in A10 format
on-hook/off-hook status and switchhook flash detection
20 Hz ringing signal connection and automatic disconnection when the
station goes off-hook
synchronization for connecting and disconnecting the ringing signal
to zero crossing of ringing voltage
loopback of SSD messages and Pulse Code Modulation (PCM) signals
for diagnostic purposes
correct initialization of all features at power-up
direct reporting of digit dialed (500-type telephones) by collecting dial
pulses
connection of –150 V dc at 1 Hz to activate message waiting lamps
lamp status detection
disabling and enabling of selected units for maintenance
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 01.04 Standard
Release 5.0 23 May 2008
Functional description 541