Signaling Interface; Operation; Loop Start Operation - Avaya Nortel Communication Server 1000 Reference

Card LAN interface
Maintenance data is exchanged with the common equipment CPU over a dedicated
asynchronous serial network called the Card LAN link.
Signaling and control
The signaling and control portion of the Universal Trunk card works with the CPU to operate
the card hardware. The card receives messages from the CPU over a signaling channel in the
DS-30X 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.

Signaling interface

All trunk signaling messages are three bytes long. The messages are transmitted in channel
zero of the DS-30X in A10 format.
Configuration information for the Universal Trunk card is downloaded from the CPU at power-
up or by command from maintenance programs. Eleven configuration messages are sent.
Three messages are sent to the card to configure the make/break ratio and A-Law or µ-Law
operation. One message is sent to each unit to configure the trunk characteristics.

Operation

Administrators can assign optional applications, features, and signaling arrangements for each
unit on the NT8D14 Universal Trunk card through the Trunk Administration LD 14 and Trunk
Route Administration LD 16 programs or jumper strap settings on the card.

Loop start operation

Loop start operation is configured in software and implemented in the card through software
download messages. When the card is idle, it provides a high impedance toward the CO for
isolation and AC (ringing) detection.
Circuit Card Reference
Operation
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