NT8D02 and NTDK16 Digital Line cards Page 523 of 894

Card control functions

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

Microcontroller

The NT8D02 Digital Line card 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 Call Server through the card LAN link:

card identification (card type, vintage, and serial number)

firmware version

self-test status

programmed configuration status

receipt and implementation of card configuration:

programming of the digital line interfaces

enabling/disabling of individual units or entire card

programming of loop interface control circuits for administration of line interface unit operation

maintenance diagnostics

The microcontroller also controls 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 Call Server over a dedicated asynchronous serial network called the Card LAN link.

Sanity timer

The NT8D02 Digital Line card also contains a sanity timer that resets the microcontroller if program control is lost. The microcontroller must service

Circuit Card Description and Installation

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Nortel Networks 553-3001-211 manual NT8D02 and NTDK16 Digital Line cards Page 523