Nortel Circuit Card 311 Reference page 726

726 NT8D15 E and M Trunk card
Figure 226
E and M Trunk card - block diagram
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Copyright © 2003-2008, Nortel Networks
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Software controlled terminating impedance (600, 900, or 1200 ohm)
two and four-wire modes.
Allows trunk type to be configured on a per port basis in software.
Software controlled 600 ohm balance impedance is provided.
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 01.04 Standard
Release 5.0 23 May 2008