SW Version 2.04 30-January-2009 Page 69 of 128
contact with MMI board having caused the switch
Switch reason: no input
data
This alarm refers to the loss of input data having caused
the switch
There is a delay of 60 seconds before the alarm appears.
Configuring modules for FM radio module-controlled input handling redundancy
through the user interface
FM radio module-controlled input handling redundancy is automatically implemented
by the FM radio modules and as such does not need configuration.
However, there is provision in the GUI to switch redundancy off.
Switching FM radio module-controlled input handling redundancy off is done through
the FM Radio tab in the navigation pane. From there, open the Redundancy tab in
the sub-tree - this will open the configuration page in the web GUI.
Figure 56 – FM radio module redundancy
General display
The configuration page lists the FM radio modules by location (i.e. slot number), and
whether it is enabled or not. The status is displayed, and can take the values of
either “logged in” or “off”. In addition, a “Switch” button is present.
Enabling redundancy
The “Enabled” check box must be selected to enable redundancy on the card.
The “Status” column displays whether the module in the slot is logged into the MMI
board or not. To enable FM radio module switching to occur, the status of the card
must be “logged in”. It should be noted that this occurs automatically when the FM
radio module is inserted.
Performing a manual switch (by operator through GUI)
The “Switch” button enables the operator to perform a manual switch from the GUI
Automatic backplane-switching at board boot time
The FM radio modules are designed to log into the first available MMI board. They will
always try to log in to the main MMI board first. If FM radio module-controlled input
handling redundancy is enabled, the FM radio module will try the backup if login fails
on the main. If FM radio module-controlled input handling redundancy is switched off,
they will only try to log into the main board.
Automatic switching
It is a non configurable hysteresis of 10 seconds from the switch criteria happening to
the actual switch.
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