Nortel Networks NN43001-301 User Manual

Page 163

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163

Figure 62
Example 3, Clocking Hierarchy referenced to a Public Network Master Clock

This is an example of a "STAR" arrangement— one Hub PBX is linked to
the Central Office and all other PBXs are connected as slaves. When a
second Digital loop from the system which forms the hub of this network
becomes 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