Nortel Networks NN43001-301 manual Example 1, Isolated Private Network

162Clock Controller description and installation

While it is beyond the scope of this discussion to provide detailed Network Synchronization, the following examples illustrate some of the basic concepts to achieve stable clocking.

Figure 60

Example 1, Isolated Private Network

In this example, there is no digital connection to the Central Office.

Figure 61

Example 2, Isolated Private Network with Secondary Reference Clock

In this example, there is no digital connection to the Central Office. For tie lines between PBXs facilitated by a central office, clocking is derived from the PBX, not the CO. When a second Digital loop is available, it can be used as a Secondary Clock source in case the Primary Source fails.

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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