DMG 3200/3100/3000 – User Manual
Page 283 (306)
Following are Manual operations parameters:
Force manual switch
This will perform an immediate MMI switch.
Following are Status parameters:
Last successful
synchronization
This shows the time last a synchronization was confirmed.
Last local change
This shows the time last local change in configuration was
introduced.
MMI Status
This displays whether the MMI module is currently active or spare.
Synchronization status
Shows the current status:
'Automatic MMI synchronization is active' - Currently no issues
'Unable to automatically synchronize MMI configuration' – Possible
issues with synchronization
10.5.2 MMI Switching Criteria
There are three possible triggers that will perform an automatic MMI Switch:
• Alarms: There are two alarms which will trigger MMI switch. They can be checked in
'Triggers' node under 'Redundancy' tree in the left panel of the GUI, in 'Card
redundancy' for 'switch' card
• Link down
• No contact with FPGA
• Slave modules lose contact with MMI (MMI dead, reboot, upgrading): All slave
modules monitor the connection to the MMI module and can switch if this is lost. All have
been configured to have this logout trigger enabled with the same delay, so they will
switch at the same time
• Manual: Twin MMI is forced to take over and all cards are switched to the other
backplane/MMI.
10.5.3 Configuration Database Synchronization
Database synchronisation will be performed automatically in both directions, ie main MMI ->
backup MMI and backup MMI -> main MMI. Immediately after introducing a change in the
configuration on either MMI, it will be synced to the twin MMI.
MMI's IP interfaces will never be synchronised, however, the IP addresses of the other
interfaces on all slave modules will be synchronized.
10.5.4 Link between MMIs
MMI Redundancy is highly dependent on external link between MMI modules. Link down state
is notified to the user as an "Unable to communicate with Twin MMI" critical alarm, and there
are important consequences on this feature if the link is down:
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