Nortel Networks NN43001-301 - Manual (Page 162)

162 Clock 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
Copyright © 2003-2007, Nortel Networks
.