Avaya S8700 Maintenance Manual page 340

Maintenance Object Repair Procedure
When both the primary and secondary source become valid, the system
(PN for S8700 Media Server systems) switches to the primary source,
since the primary source is always preferred over the secondary source
when both sources are equally healthy.
Synchronization Troubleshooting
For Stratum-4 operation, major and minor alarms indicate that there is a problem
with the system synchronization references. These alarms will be resolved when
the alarmed synchronization reference is restored.
The change synchronization command allows primary and secondary
references to be administered per cabinet.
The status synchronization cab # command shows the current synchronization
reference per cabinet. The list synchronization command shows the
synchronization references (e.g. primary, secondary) that are administered.
The list timing-source command displays all DS1 and UDS1 locations that are
allowed to be administered as primary or secondary references with the change
synchronization command.
Other commands associated with Synchronization Maintenance are disable
synchronization-switch and enable synchronization-switch. These
commands are used to disable the ability of Synchronization Maintenance to
switch between synchronization references and to enable this switching ability,
respectively. The set synchronization command is executed only after
synchronization has been disabled and is used to manually switch to a specific
synchronization reference. This command is useful to diagnose synchronization
problems by forcing a specific reference (DS1, UDS1, or Tone-Clock) to be the
system synchronization reference to determine if a specific reference is providing
a valid timing signal.
Troubleshooting Approach
Slip errors are the primary symptom associated with being unsynchronized.
A correct Synchronization plan for the network keeps the systems within the
network transmitting data at approximately the same rate to avoid situations
where:
One system transmits data at a rate faster than another system can receive
the data (in which case data is lost).
One system transmits data at a rate slower than another system expects to
receive data (in which case data is repeated).
Either of these situations, data being lost or repeated, is a slip.
8-1036 Issue 1 May 2002 555-233-142