Nortel Circuit Card 311 Reference page 746

746 NT8D15 E and M Trunk card
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The signaling and control portion of the trunk card works with the CPU to
operate the card hardware. The card receives messages from the CPU over
a signaling channel in the DS30X loop and returns status information to the
CPU over the same channel. The signaling and control portion of the card
provides the means for analog loop terminations to establish, supervise and
take down call connections.
The signaling and control operation of the card performs many functions
which are handled by different functional units. Some of the functions of the
signaling and control portion of the E & M card are:
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Maintenance features
The following features are provided for maintenance of the E and M trunk:
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Copyright © 2003-2008, Nortel Networks
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decode received messages to set configuration and activate/deactivate
interface relays for PCM loopback diagnostic purposes
decode outpulsing messages (one per digit) from the CPU to drive
outpulsing relays at 20 pps, 10 pps1 (primary), or 10 pps2 (secondary)
monitor signals from the trunk interface and generate a message when
required for each state change
control disabling and enabling of unit or card
control A-Law and Mu-Law operation modes
control transmission pad settings
Communications between the card and the CPU
Monitor signals from the trunk interface and generate a message when
required for each state change
Decode received messages and activate/deactivate configuration and
interface relays PCM loopback for diagnostic purposes
Disable and enable units for maintenance
Drive Light Emitting Diode (LED) on faceplate
Decode outpulsing messages (one per digit) from the CPU to drive
outpulsing relays
— Make break ratios (20pps, 10pp1, 10pps2) are downloaded by
software.
Control of A/mu-law operation
indication of card status from self-test
software enable and disable capability for individual units or entire card
loopback of PCM signals to DS-30X for diagnostic purposes
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 01.04 Standard
Release 5.0 23 May 2008