Nortel Networks 1000 - Manual (Page 497)

Functional description 497
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
The universal trunk card contains eight identical and independently
configurable trunk interface units (also referred to as circuits). Each
unit provides impedance matching and a balance network 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 ohm) selectable on a per unit basis
(minimum vintage BA)
•
balance impedance (600 or 900 ohm 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
The NT8D14 Universal Trunk Card passes voice and signaling data over
DS-30X loops, and maintenance data over the card LAN link.
The NT8D14 Universal Trunk Card contains eight identical and
independently configurable trunk interface units (also referred to as
circuits). Each unit provides impedance matching and a balanced network
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 02.06 Standard
27 August 2008
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.