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Communication Manager Maintenance-Object Repair Procedures
2252 Maintenance Procedures for Avaya Communication Manager 3.0, Media Gateways and Servers
TDM-CLK (TDM Bus Clock)
S8700 | 8710 / S8500
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)
on page 2327.
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 | 8710: 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 | 8710: 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.
MO Name Alarm Level Initial SAT Command to Run Full Name of MO
TDM-CLK MAJ test tone-clock location short TDM bus Clock
TDM-CLK MIN test tone-clock location short TDM bus Clock
TDM-CLK WRN release tone-clock location TDM bus Clock
Table 805: Synchronization - Tone Clock Roles
Tone-Clock
Role
Synchronization
Facilities
Initial External
Synchronization
Source
Backup External
Synchronization
Source
Internal Source
S8700 MC
MASTER
Stratum-3 clock Source “A” Source “B” Local
oscillator
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