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Protection Router
Many redundant systems use protection routers to help recover from system failures. For example, if a system has two modules of same type (one primary and one backup), video and audio routers might switch a set of input signals between the two modules. During normal operation, the router sends the video and audio signals to the primary module. During a failover operation, the router redirects the primary module's video and audio to the backup module, thus ensuring continued availability of the incoming feed.
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