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In this case there is no redundancy of course. Otherwise it can be attached through a RedBox (redundancy box), a device that provides an interface to both LAN's and behaves like a doubly attached node ...
The LAN969x Ethernet switches support multiple HSR and PRP Redundancy Box (RedBox) instances that can operate in parallel and in series, as well as at Ethernet port speeds from 10 Mbps to 10 Gbps.