There are two different XRS7000 versions available: XRS7003 (three ports) and XRS7004 (four ports). XRS7003 can be employed in HSR and PRP End Nodes, while XRS7004 can be used in both HSR and PRP End Nodes and RedBoxes. A QuadBox can be built using two XRS7004 devices.
High-availability Seamless Redundancy (HSR) is a standard (IEC 62439-3 Clause 5) fulfilling the need for reliable Ethernet. It is suitable for applications that require short reaction times and high availability. With HSR, a network can be made very robust with zero reaction time in case of a single failure, with predictable latency and with less cost than with other Ethernet redundancy solutions.
Many critical applications require a network with zero downtime. The network is fully operational even during maintenance, as any device can be disconnected and replaced without breaking the network connectivity. This makes the network very reliable and highly available.
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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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