DMG 3200/3100/3000 – User Manual
Page 284 (306)
• Database synchronization will not be available. This will be shown on Synchronization
status.
• The mechanism to enforce all modules to be logged into the same backplane will not
work, as each MMI has no information about the other.
• Cards logged into one MMI will not be shown on the other. This will be shown as 'Not
present' and 'Card missing' alarms.
• No switch will be available as the mechanism to move modules from one side to the other
is not working.
When the link is restored, and Main MMI is running properly, there are two possible situations:
• There is no MMI switch registered, so there is no reason to stay in Backup MMI. All cards
will be forced to switch back and Main MMI will be Active again.
• There is a MMI switch registered. This means either manual or automatic (triggered by
alarms) MMI switch was performed before losing contact with twin MMI (link down). In
order to keep the former state, cards will stay in the second backplane and Backup MMI
will be Active.
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