Nortel Networks 311

Functional description 581

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 conversionof tr unk analog voiceband

signals to digital PCM signals. Each codec suppor ts 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 transmissionloss 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 conversionof tr unk 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 transmissionloss control

The NT8D14 Universal TrunkCard 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 referredto as circuits).

Each unit provides impedance matching and a balanced network in a signal

transformer/analog hybrid circuit. Also provided are relays for placing

Nortel Communication Server 1000

Circuit Card Reference

NN43001-311 01.04 Standard

Release 5.0 23May 2008