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NT8D15 E&M Trunk card Page 639 of 906
Circuit Card Description and Installation
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