Avaya 03-300430 User Manual

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When both the primary and secondary source become valid, the system switches to the 
primary source, since the primary source is always preferred over the secondary source 
when both sources are equally healthy.

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.
Use status synchronization to show the current synchronization reference per cabinet. 

Use display synchronization or list synchronization to show the primary and/or 

secondary synchronization references that are administered.
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. Use set 
synchronization only after synchronization has been disabled, to manually switch to a 

specific synchronization reference. Use set synchronization to help 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.

Slip errors are the primary symptom associated with being un-synchronized.
A correct Synchronization plan for the network keeps the systems within the network 
transmitting data at approximately the same rate to avoid situations where:

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One system transmits data at a rate faster than another system can receive the data (in 
which case data is lost).

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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.
When troubleshooting synchronization problems when slips are the primary error log entry 
indications of a synchronization problem, requires that the problem be isolated to:

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A problem outside of the switch (That is, the switch is not properly synchronized to the rest 
of the network.)

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A problem internal to the switch