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DEFINITY Enterprise Communications Server Release 5
Maintenance and Test for R5vs/si
555-230-123
Issue 1
April 1997
Maintenance Object Repair Procedures
Page 10-1326SYNC (Synchronization)
10
scenario, is designated the
master
port network and the EPNs are called
slave
port networks. The
master
port network is defined as the port network that
contains the system synchronization source. If the primary synchronization
reference does not provide a valid timing signal, Synchronization Maintenance
switches to the secondary reference. Both the primary and secondary
references must reside in the same port network, but there is no restriction
as to in which port network both must reside (that is, both references may
be in an EPN). The recommended placement of the references is in the PPN.
There are two kinds of Stratum 4 synchronization that are supported: Type I and
Type II. Stratum 4 type I is more stable than Type II and provides some switching
capability at the hardware level. Stratum 4 Type II operation is the only
synchronization strata provided by Generic 1. It is important to note that Stratum
4 Type I operation is not possible when one or both of the DS1 interface circuit
packs providing the reference sources is a TN722. Both must be the TN767 or
TN464 (suffix C or higher).
Stratum 3 Synchronization
The following diagram may help you to understand the synchronization
components needed for Stratum 3 synchronization.
NOTE:
This is only one possible configuration.