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Installation, Operation, Maintenance Manual
Clock synchronization is the mechanism of setting trunks clocks to be the same. Two slots
(each populated by a TP board) are used as reference clock source. Clock synchronization
operates as follows:
1.
Each of the 16 trunks in each TP board can be configured with provisioning parameter
tgTrunkClockPriority (refer to the Element Management System User's Manual,
Document #: LTRT-910xx for detailed information on all trunk-level provisioning
parameters). This parameter can be configured with a number in the range 0-15.
2.
The slot containing the TP board with the trunk whose tgTrunkClockPriority parameter
is configured with the highest value, assumes the function of clock board slot A. The
trunk in the board serves as the clock reference trunk.
3.
The slot containing the TP board with the trunk whose tgTrunkClockPriority parameter
is configured with the second highest value, assumes the function of clock board slot
B. The trunk in the board serves as the clock reference trunk.
4.
Under the Clock entity (refer to the Element Management System User's Manual,
Document #: LTRT-910xx), the parameters Slot A CLK Reference and Slot B CLK
Reference are configured to refer to (2) and (3) respectively.
12.5.2
Configuring Clock Control
The following modes are supported:
'NONE' Working Mode (default) (refer to "'NONE' Working Mode" below)
'SYNCHRONIZED' Working Mode (refer to "'SYNCHRONIZED' Working Mode" below)
12.5.2.1
'NONE' Working Mode (Unsynchronized Mode)
'NONE' Working Mode is the initial (default) mode that assumes that all trunks in the same
group are synchronized (each Media Gateway board has 2 trunk groups, trunk number 1-8
and 9-16).
In 'NONE' working mode:
•
•
•
•
•
Note:
12.5.2.2
'SYNCHRONIZED' Working Mode
Version 3.0
The entire media gateway is unsynchronized; this is the default clock
synchronization mode of the system and does not require any provisioning.
st
nd
Both 1
and 2
Clock Slot Ref are set to 0 (part of the Clock parameters
provisioning).
Each trunk group (1-8, 9-16) arbitrary chooses one of its trunks to be a
reference trunk for synchronization of other trunks of the group.
In this mode, the media gateway can provide a clock source only if the
external system is connected through the same group of trunks (either 1-8,
or 9-16).
All trunks hosted by a single group are connected to the same PSTN switch.
In 'NONE' mode, the media gateway should not provide a clock reference
to the PSTN switch.
12. Operating the Media Gateway Using the EMS
115
October 2005
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Troubleshooting
