Nortel Circuit Card 311 Reference page 544

544 NT8D09 Analog Message Waiting Line card
Figure 136
Analog message waiting line card - block diagram
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Copyright © 2003-2008, Nortel Networks
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transmission and reception of scan and signaling device (SSD) signaling
messages over a DS30X signaling channel in A10 format
on-hook/off-hook status and switchhook flash detection
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 01.04 Standard
Release 5.0 23 May 2008