Demand test descriptions and error codes - Avaya Support

TDM-CLK (TDM Bus Clock)
MO Name
in Log
TDM-CLK MAJ
MIN
Alarm Level Initial Command to Run Full Name of MO
test tone-clock location TDM bus Clock
WRN release tone-clock location
Note:
Note: Replacing the Tone-Clock circuit pack or the IPSI requires a special procedure
described in the documentation for TONE-BD (Tone-Clock Circuit Pack). That
section also describes the LED displays for these circuit packs.
The Time Division Multiplex (TDM) Bus Clock resides on the Tone-Clock circuit, providing
clocking signals both for the TDM bus and the LAN Bus. The Tone-Clock circuit is a critical
component in the system and is necessary to ensure the operation of every port circuit pack in
the system. The TDM buses of every EPNs is synchronized together. The system timing
reference can be derived internally from the Tone-Clock circuit in any PN, or from an external
(off-board) timing reference. Currently, the TDM bus Clock supports synchronizing the TDM bus
with interface rates from Digital Signal 1 (DS1) facilities as primary or primary and secondary
references, (S8700 series: and from Stratum-3 clock (STRAT-3) facilities. Only the TN780
tone-clock supports a Stratum-3 clock.)
Moreover, the TN2314 Processor/Tone-Clock circuit pack aids in monitoring and selecting
synchronization references. The TN2314 Processor/Tone-Clock circuit pack, after detecting that
the external source of timing is not valid, will automatically begin its escalation procedure,
according to the facilities administered. In the following table, successive losses of signal cause
escalation from left to right.
Switching back to a DS1 source is handled by synchronization maintenance, once any problems
with it are corrected and tested.
S8700 series: However, once synchronization has been switched to the internal timing source of
the master Tone-Clock circuit, switching back to a Stratum-3 clock must be initiated by a
technician after the external reference has been repaired.
Table 259: Synchronization - Tone Clock Roles 1 of 2
Tone-Clock
Role
S8700-series
Fiber-PNC
MASTER
Synchronization
Facilities
Initial External
Synchronization
Source
Backup External
Synchronization
Source
964 Maintenance Alarms for Communication Manager, Media Gateways and Servers
Internal Source
Stratum-3 clock Source “A” Source “B” Local
oscillator
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