SW Version 2.04
30-January-2009
Page 39 of 128
Figure 24 – MMI correlation
The purpose of MMI Correlation is to get rid of the card missing alarms on the spare
MMI board. The “Status” column displays whether the module in the slot is logged
into the MMI board or not. On spare MMI board card status “Logged in to twin MMI”
shows that this card is logged in to the other MMI board.
Figure 25 - MMI correlation (spare MMI)
An alarm with the message
Unable to communicate with TWIN MMI
is generated
whenever connection breaks between MMI Input cards.
This alarm will be triggered if the twin MMI IP address from the GUI is removed, one
of the input cables is disconnected, or one of the MMI cards is removed.
Enabling redundancy
The “
Enabled
” check box must be selected to enable redundancy on the card. Each
Decoder can be configured at anytime no matter which backplane is logged in to.
Switch Delay
Once the decoder meets the described conditions to log in to the twin MMI
automatically, it still needs to wait a determined switch delay period of time. This
hysteresis period is configurable for each decoder card in the
Switch Delay
text field
located in the
Internal redundancy supported cards
section.
The value is captured by the MMI in seconds. The minimum value allowed is 8
seconds, and the default value is 15 seconds. If it is needed, the same decoder can
have a different
Switch Delay
value for each backplane, and it can be modified in the
MMI even when the Decoder is connected to the other backplane.
After the switch delay time is reached, the Decoder card will switch to the twin MMI. If
the login succeeds and the input signal is correct, the video and sound will be back on
the screen.