![]() They may also have one or more additional Ethernet ports, for example for maintenance access. Typically HSR rings consist of three kinds of nodes:Įnd-nodes have two external Ethernet ports to connect to one HSR ring. Two HSR rings connected to each other’s using QuadBoxes ![]() If either one of the paths is broken, due to link or node failure, the frames are still able to reach their destination. The source node duplicates all the frames it has to send, and sends them using two different paths to their destination. Originally HSR was targeted at smart grid electrical substation automation, but it can also be employed in other critical networking applications, such as industrial automation, motion control and transportation. 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. It is suitable for applications that require short reaction times and high availability. High-availability Seamless Redundancy (HSR) is a standard (IEC 62439-3 Clause 5) answering to the need for reliable Ethernet. Network downtime always generates unwanted costs, and in some applications network downtime is not acceptable at all, not even during maintenance. High-availability Seamless Redundancy (HSR) ![]()
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