Circuit Power - Avaya Nortel Communication Server 1000 Reference

NT8D02 and NTDK16 Digital Line cards
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 the sanity timer every 1.2 seconds.
If the timer is not properly serviced, it times out and causes the microcontroller to be hardware
reset.

Circuit power

The +15 V DC input is regulated down to +10 V DC for use by the digital line interface circuits.
The ±15.0 V DC inputs to the card are used to power the loop interface circuits.
356 Circuit Card Reference
Comments? infodev@avaya.com
July 2011