Demand test descriptions and error codes - Avaya Support

S8700-series Fiber-PNC
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 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 Fiber-PNC 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 Server systems)
switches back to the primary or secondary source.
● 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.
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.
896 Maintenance Alarms for Communication Manager, Media Gateways and Servers