Nortel Circuit Card Installation Manual page 554

Page 554 of 906
Card control functions
553-3001-211 Standard 3.00
NT8D09 Analog Message Waiting Line card
Control functions are provided by the following:
• a microcontroller
• a card LAN interface
• signaling and control circuits on the analog message waiting line card
Microcontroller
The analog message waiting 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 CE CP 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 codecs
— enabling/disabling of individual units or entire card
— programming of input/output interface control circuits for
administration of line interface unit operation
— enabling/disabling of an interrupted dial tone to indicate call waiting
— maintenance diagnostics
— transmission loss levels
Signaling and control
The signaling and control portion of the card provides circuits that establish,
supervise, and take down call connections. These circuits work with the
system CP to operate the line interface circuits during calls. The circuits
receive outgoing call signaling messages from the CP and return incoming
call status information over the DS-30X network loop.
August 2005