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Installation, Operation, Maintenance Manual
green when the operational state is normal
blue/orange/yellow/red when operations is affected by a fault according to its alarm
severity.
12.4.1
Media Gateway Board Redundancy
To set a Media Gateway board as the redundant board, right-click on the desired board
and from the popup menu, select the Make Board Redundant option.
Note:
Setting the board as redundant provides redundancy for all chassis Media Gateway boards
in an N:1 redundancy regime.
To cancel the Redundant functionality on the Media Gateway board, right-click on the
designated board and from the popup menu, select the Make Board Non Redundant
option.
If the redundant Media Gateway board is utilized to cover the functionality of
a failed Media Gateway board, it is incumbent on the operator to replace the
failed Media Gateway board and return the redundant
board to Standby status as soon as possible. This way, the redundant Media
Gateway board can resume its protecting status should a Media Gateway
board again require backup coverage.
12.4.2
Ethernet Switch Boards Redundancy
The two Ethernet Switch boards operate as an Active/Standby pair. In Media Gateway
3500, the Ethernet Switch board in slot 3 is the initially Active Ethernet Switch board (in the
default settings) and the Ethernet Switch board in slot 4 is the initially Redundant (Standby)
board. In the EMS, the Active Ethernet Switch board is displayed in black and the Standby
Ethernet Switch board is displayed in blue-gray. An Ethernet Switch board which is
disabled by a lock operation is displayed in red.
The SC board audits and aligns all element in the system to interconnect via the
designated Active Ethernet Switch board. Whenever a Media Gateway board or SC board
makes a switchover to the secondary or redundant SC board (in which the Standby SC
takes over the Active mode), the now Active SC board reassesses the situation and re-
aligns all of the boards either by switching to the secondary or redundant Ethernet Switch
board (in which the Standby ES takes over the Active mode), or by issuing a Media
Gateway board switchover.
If for any reason, Ethernet Switch switchover occurs, i.e., the initially Active Ethernet
Switch in slot 3 becomes Redundant (Standby) and initally Standby Ethernet Switch in slot
4 becomes Active, it is incumbent on the user to return the (now Redundant or Standby)
Ethernet Switch in slot 3 to function as the Active Ethernet Switch board and simmilarly to
return to (now Active Ethernet Switch in Slot 4 to function as the Standby Ethernet board.
Version 3.0
The Media Gateway board designated as the Redundant board must be
accompanied by the RTM behind it.
12. Operating the Media Gateway Using the EMS
CAUTION
113
Media Gateway
October 2005
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Troubleshooting
