Nortel Networks NN43001-301 manual Example 4, Alternate Clocking from the same CO

164Clock Controller description and installation

Figure 63

Example 4, Alternate Clocking from the same CO

In this case, a digital connection to the Central Office can exist (i.e. Loops X and Y). When a second Digital loop from the CO or Master M-1 becomes available, it can be used as a Secondary Clock Source in case the Primary Source fails.

To avoid timing loops, in example 4-4 the most reliable slave system should not have a Secondary Clock Source (SREF= <cr>). In this example, this is illustrated by the node which supports loops X and Z.

Nortel Communication Server 1000

ISDN Primary Rate Interface Installation and Commissioning

NN43001-301 02.03 Standard

Release 5.5 7 December 2007

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