Functional description 581Also provided are relays for placing outgoing call signaling onto the trunk.Signal detection circuits monitor incoming call signaling. Two codecs areprovided for performing A/D and D/A conversion of trunk analog voicebandsignals to digital PCM signals. Each codec supports four trunk interfaceunits. 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-30Xnetwork loop for diagnostic purposes• switchable pads for transmission loss controlThe universal trunk card contains eight identical and independentlyconfigurable trunk interface units (also referred to as circuits). Eachunit provides impedance matching and a balance network in a signaltransformer/analog hybrid circuit.Also provided are relays for placing outgoing call signaling onto the trunk.Signal detection circuits monitor incoming call signaling. Two Codecs areprovided for performing A/D and D/A conversion of trunk analog voicebandsignals to digital PCM signals. Each Codec supports four trunk interfaceunits. 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-30Xnetwork loop for diagnostic purposes• switchable pads for transmission loss controlThe NT8D14 Universal Trunk Card passes voice and signaling data overDS-30X loops, and maintenance data over the card LAN link.The NT8D14 Universal Trunk Card contains eight identical andindependently configurable trunk interface units (also referred to as circuits).Each unit provides impedance matching and a balanced network in a signaltransformer/analog hybrid circuit. Also provided are relays for placingNortel Communication Server 1000Circuit Card ReferenceNN43001-311 01.04 StandardRelease 5.0 23 May 2008Copyright © 2003-2008, Nortel Networks.
