Nortel Networks 1000 - Manual (Page 498)

498 NT8D14 Universal Trunk card
in a signal transformer/analog hybrid circuit. Also provided are relays for
placing 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:
•
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
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:
• 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 02.06 Standard
27 August 2008
Copyright © 2003-2008 Nortel Networks
.