Nortel Networks Circuit Card User Manual

 NT8D02 and NTDK16 Digital Line cards

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.

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.

Maintenance data is exchanged with the common equipment Call Server over 
a dedicated asynchronous serial network called the Card LAN link. 

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