NT8D15 E&M Trunk card Page 627 of 894

Card control functions

Control functions are provided by a microcontroller, a card LAN, and signaling and control circuits on the E&M trunk card.

Microcontroller

The E&M trunk card contains a microcontroller that controls the internal operation of the card. The microcontroller provides the following functions:

card-identification

self-test

control of card operation

maintenance diagnostics

Card LAN

The card LAN provides a serial communication link for transferring maintenance data and control signals between the trunk card and the SSC card. The card LAN controls the microcontroller. The following functions are supported:

providing card ID/RLS

reporting self-test status

polling from the controller card

enabling/disabling of the DS-30X link

Circuit Card Description and Installation

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Nortel Networks 553-3001-211 manual Card control functions, Card LAN