Card Control Functions; Microcontrollers; Card Lan Interface - Avaya Nortel Communication Server 1000 Reference

circuit during calls. The circuits receive outgoing call signaling messages from the controller
and return incoming call status information to the controller over the DS-30X network loop.

Card control functions

Control functions are provided by a microcontroller and a card LAN link on the LEI. A sanity
timer is provided to automatically reset the card if the microcontroller stops functioning for any
reason.

Microcontrollers

The LEI contains a microcontroller that controls the internal operation of the card and the serial
card LAN link to the controller card. The microcontroller controls the following:
• reporting to the CE CP through the card LAN link
- card identification (card type, vintage, serial number)
- firmware version
- self-test results
- programmed unit parameter status
• receipt and implementation of card configuration
- control of the E1 line interface
- enabling/disabling of individual units or entire card
- programming of loop interface control circuits for administration of channel operation
- maintenance diagnostics
• interface with the line card circuit
converts on/off-hook, and ringer control messages from the DS-30X loop into A/B bit
manipulations for each time slot in the E1 data stream, using channel associated
signaling.
• the front panel LED when the card is enabled or disabled by instructions from the NT8D01
controller card.

Card LAN interface

Maintenance data is exchanged with the Common Equipment CPU over a dedicated
asynchronous serial network called the Card LAN link. The Card LAN link is described in
LAN link on page 38.
Circuit Card Reference
Functional description
Card
July 2011 201