APPEAR AS Confidential 305/352
Services currently running on that particular module
The status of the module – whether it is logged into the main MMI or the Twin
MMI module.
Once the decoder, FM Radio, or QAM output module meets the described
conditions to log in to the Twin MMI automatically, it still needs to wait a
determined period of time. This switching delay is the number of seconds for the
module to switch connections from one backplane to another. Once the switch
delay time is reached, the module will switch backplanes. If the login succeeds
and the input signal is correct, the video and sound will be back on the screen.
The minimum value allowed for Switching Delay is:
• 8 seconds for decoders
• QAM/COFDM output fixed 15 seconds
The default value is 15 seconds. If needed, the same module can have different
Switching Delay values for each backplane. This parameter can be modified in
the MMI even if the module is connected to another backplane.
This Switch button enables the operator to perform a manual switch from the
GUI. When internal redundancy is enabled, this button will be available. The
module will switch right after the operator clicks the button – without any
Switching Delay.
Reboot
The Decoders, FM Radio and QAM Output modules are designed to log into the first available MMI board. They
will always try to login to the Main MMI board first, which is connected to default backplane. But only during the
boot process, if login fails through the default backplane, it will try to connect to the backup even if internal
redundancy is disabled in order to find a MMI to login to.
For the Twin MMI to work properly, it is essential that both MMI modules have an IP
connection.
12.2.4 DECODER INTERNAL REDUNDANCY
Decoder internal redundancy will be triggered by the following alarms:
• Transport stream missing
• Internal link down
• No contact with MMI module
• Video/Audio PID missing
If the decoder loses its link to the switch card it is currently connected to, it will attempt to switch backplanes.
This can be simulated by actually removing the switch for the first backplane (the blue one). The effect will be
that the decoder will stop communicating on the blue link and connect to the second backplane (the red one).
If a problem is detected in the configured Decoder Channels, i.e., if transport stream is missing on both the
channels when they are configured, then the decoders will switch to the other backplane. This can be simulated
by actually removing the data cable for Input card or by stopping the input signal.
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