Nortel Networks 553-3001-211 manual 542 of 894 NT8D09 Analog Message Waiting Line card

Page 542 of 894 NT8D09 Analog Message Waiting Line card

Card control functions

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.

553-3001-211 Standard 2.00 September 2004