The Parallel Redundancy Protocol (PRP) is an IEC standard (IEC 62439-3 Clause 4) providing redundant Ethernet. Under PRP, each node is connected to two separate parallel LANs, parallel Local Area Networks (LANs). Source nodes send two copies of each packet, one over each network. When a destination node receives a packet, it accepts the first copy and discards the second copy, eliminating the duplicate.
HSR is more cost-effective than PRP because HSR requires significantly less cabling. Therefore, HSR can be considered the most effective redundancy solution available for Ethernet at the moment.
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