SW Version 2.04 30-January-2009 Page 36 of 128
4.3.8.3 Internal Redundancy
Overview
Internal redundancy refers to the process by which decoder can receive configuration
from two different MMI boards, but not at the same time.
The chassis will have two switches. One switch will be configured as the main switch
while the other switch will be configured to be the redundant switch.
There will be two input cards, one for each switch. It must be noted that decoder
redundancy configuration is currently only supported for IP input modules.
Hardware requirements
The following hardware is required for the implementation of decoder-controlled input
handling redundancy:
2 IP input modules The unit must be equipped with at least two IP input modules.
2 switches
Decoder cards. For decoder-controlled input handling redundancy to be
implemented, switching configuration must be known at set
up. Therefore both IP input cards must have MMIs (though
one will be redundant). It should be noted that both IP input
modules do not need to have the same configuration.
Input redundancy: it should be noted that dual input and decoder-controlled input
handling redundancy on one unit is not supported.
Alarms that cause switching:
Decoder-controlled input handling redundancy will be implemented with the following
alarm:
Transport Stream Missing
Internal link down
No contact with input card
Switch alarm
It should be noted that should a problem on one stream causes one decoder to
switch, the other decoder on the decoder module will also switch.
Alarms displayed as a result of the switch
Switched, reason: link
down
This refers to internal link failure.
Switched, reason: logout The decoder card is logged out from the input card
hosting the MMI.
Switched, reason: alarm This alarm refers to input stream failure having caused
the switch.
Switched, reason: operator
This alarm refers to the operator having performed a
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