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Communication Manager Maintenance-Object Repair Procedures
2146 Maintenance Procedures for Avaya Communication Manager 3.0, Media Gateways and Servers
Clock Synchronization
Note:
Note: S8700 MC: Stratum-3 clocking is not available for a PN where the Tone-Clock
function is supplied by either a:
● TN2312 IPSI circuit pack’s Tone-Clock circuit
● TN2182 Tone-Clock circuit pack
This section discusses synchronization with Stratum-3 and -4 clocking devices.
S8700 MC
Stratum-3 Synchronization
Since the clock module on the TN2312 does not support synchronization with an external
Stratum-3 clocking device, you may provide Stratum-3 clocking for a S8700 Media Server
system by using the TN780 Tone-Clock circuit pack in a non IPSI connected port network. To
bring in the external Stratum-3 clocking signals into the TN780, a processor carrier is needed.
This new PN control carrier will replace the processor carrier in the old PPN converted to PN 1.
The Stratum-3 clocking must come into Port Network #1 because the S8700 Multi-Connect
software has the Stratum-3 clocking hard-coded to this port network.
Stratum-4 Synchronization
The system can be configured with primary and secondary synchronization references (DS1 or
UDS1 Interface circuit packs) when using Stratum-4 synchronization. If this is the master
synchronization source for the network, then its local oscillator is used and no DS1s are used as
references.
If this system is a slave in the network, a primary reference must be used as the synchronization
reference and a secondary reference is optional:
● If the primary synchronization reference is not providing a valid timing signal, the system
automatically switches to the secondary synchronization reference.
● If the primary synchronization reference is invalid and secondary reference does not
provide a valid timing signal or is not administered as a synchronization reference, an
IPSI’s Tone-Clock circuit or a Tone-Clock circuit pack provides the PN’s timing source.
● If the system is using the local oscillator as the timing source (both the primary and
secondary references are providing invalid timing signals), should either the primary or
secondary reference becomes valid again, the system (PN for S8700 Media Server
systems) switches back to the primary or secondary source.