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DEFINITY ECS Release 8.2 Maintenance for R8.2csi
555-233-119 Issue 1
April 2000
Maintenance Objects
3-1003SYNC (Synchronization)
3
SYNC (Synchronization)
The Synchronization Maintenance is composed of both hardware and software
components and its purpose is to provide a common reference frequency for
reliable digital communication between systems and other PBXs, COs or CPE.
Synchronization is achieved via the use of several system components which
include the Tone-Clock and the DS1 Interface.
Depending on the network synchronization plan and the status of
synchronization sources, the system timing reference may be a Tone-Clock
circuit pack or DS1 interface circuit packs. Stratum 4 synchronization extracts
timing information directly from a DS1 reference or from a Tone-Clock.
Stratum 4 Synchronization
The system can be configured with primary and secondary synchronization
references (DS1 interface circuit packs) when using Stratum 4 synchronization.
Both references are optional (since the local oscillator can be used), and the
secondary reference is optional if a primary is provided. If this system is the
master for the network, then its local oscillator would be used and no DS1s would
be used as references.
If the primary synchronization reference is not providing a valid timing signal, the
system automatically switches to the secondary synchronization reference. If the
secondary reference does not provide a valid timing signal or is not administered
as a synchronization reference, a Tone-Clock circuit pack provides the system
timing source. The system does not revert to the primary if the current reference
is the secondary and is failing; however the system switches from the local
oscillator to another reference when the new reference becomes available.
Both
the primary and secondary references must reside 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. 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 TN767B (or higher)
or TN464C (or higher).
MO Name (in
Alarm Log)
Alarm
Level Initial Command to Run Full Name of MO
SYNC MAJOR display errors Synchronization Maintenance
SYNC MINOR display errors Synchronization Maintenance
SYNC WARNING test synchronization Synchronization Maintenance