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Installation, Operation, Maintenance Manual
12.5.3
Clock Synchronization Configuration Limitations for TP-1610
Configurations
When working with a redundant system scheme, there are a few limitation that require
note. Generally, the following clock synchronization configurations are supported:
•
•
12.5.3.1
SYNC Mode
When working in SYNC mode with a redundant system scheme, the following must be
assured:
1.
There must always be a sync clock in the chassis – TP-1610 boards A and B
2.
The redundant (standby) board must function as a clock slave – TP-1610 board R
To achieve this requirement, at least 3 Media Gateway boards must be included in the
system:
•
•
Note:
12.5.3.2
NONE (Synchronized) Mode
When working in NONE mode with a redundant system scheme, the redundant (standby)
TP-1610 board is required and does not handle the clock redundancy in chassis. All the
trunks of the active TP-1610 board are synchronized in groups of 8 trunks, where each TP-
1610 board has 2 trunk groups, trunk numbers 1 to 8 and 9 to 16. In this mode the entire
media gateway is unsynchronized – instead, each trunk group (1 to 8, 9 to 16) arbitrary
chooses one of its trunks to be a reference trunk for synchronization of other trunks of the
group. In this mode, all trunks hosted by a single group are connected to the same PSTN
switch.
Note:
Version 3.0
SYNC mode
NONE (Synchronized) Mode
Two clock master TP-1610 boards in the chassis - If the clock master board
A fails, the second clock master TP-1610 board B continues supplying the
sync clock.
One redundant board for the TP switchover - If the clock master board A
fails, its trunks are connected to the redundant (standby) TP-1610 board R,
which functions as a slave clock after switchover.
The redundant TP-1610 board can not function as the clock master.
In 'NONE' mode, the media gateway does not provide a clock reference.
12. Operating the Media Gateway Using the EMS
117
October 2005
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Troubleshooting
