Nortel Circuit Card 311 Reference page 577

Figure 144
NT8D14 Universal trunk card - block diagram
The Universal Trunk Card:
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Copyright © 2003-2008, Nortel Networks
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allows trunk type to be configured on a per unit basis
indicates status during an automatic or manual self-test
provides card-identification for auto configuration, and to determine the
serial number and firmware level of the card
converts transmission signals from analog-to-digital/digital-to-analog
operates in A-Law or µ-Law companding modes on a per unit basis
provides software selected terminating impedance (600, 900, or 1200
ohm) on a per unit basis (1200 ohm supported for RAN trunks only)
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 01.04 Standard
Release 5.0 23 May 2008
Functional description 577