Nortel Communication Server 1000 Manual page 102

102 Integrated Digital Access (IDA) equipment
Figure 25
DDP2 cable without an I/O panel
Clock for the NT5D97AD
Clock operation
There are two types of clock operation - tracking mode and free-run mode.
Tracking mode In tracking mode, the DDP2 loop supplies an external
clock reference to a clock controller. Two DDP2 loops can operate in
tracking mode, with one defined as the primary reference source for clock
Nortel Communication Server 1000
DASS2 Fundamentals
NN43001-571 04.01 4 June 2010
Copyright © 2007-2010 Nortel Networks. All Rights Reserved.