Nortel Circuit Card 311 Reference page 582

582 NT8D14 Universal Trunk card
outgoing call signaling onto the trunk. Signal detection circuits monitor
incoming call signaling. Two CODECs are provided for performing A/D and
D/A conversion of trunk analog voiceband signals to digital PCM signals.
Each Codec supports four trunk interface units. The following features are
common to all units on the card:
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Card control functions
Control functions are provided by a microcontroller, a card LAN interface,
and signaling and control circuits on the NT8D14 Universal Trunk card.
Control functions are provided by a microcontroller, a card LAN interface,
and signaling and control circuits on the universal trunk card.
Control functions are provided by a microcontroller, a card LAN interface,
and signaling and control circuits on the NT8D14 Universal Trunk Card.
Microcontroller
The NT8D14 Universal Trunk 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:
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Copyright © 2003-2008, Nortel Networks
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trunk type configurable on a per unit basis
terminating impedance (600 or 900 ohms) selectable on a per-unit basis
(minimum vintage BA)
balance impedance (600 or 900 ohms or complex impedance network)
selectable on a per-unit basis (minimum vintage BA)
control signals provided for RAN and paging equipment
loopback of PCM signals received from trunk facility over DS-30X
network loop for diagnostic purposes
switchable pads for transmission loss control
reporting to the CE CPU 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 through the card LAN
link:
— programming of the codecs
— enabling/disabling of individual units or entire card
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 01.04 Standard
Release 5.0 23 May 2008