Historically, substation automation has employed multiple different protocols, often proprietary, which lacked interoperation across different vendors devices. This has led to the creation of a new international specification, IEC 61850, defining a common platform for substation automation networking based on Ethernet technology. IEC 61850 defines a distributed ring topology supporting zero switchover time in case of single failure, known as High-availability Seamless Redundancy (HSR).
High-availability Seamless Redundancy (HSR)-supporting nodes are attached to the network by two Ethernet ports. Each node duplicates each egress packet and forwards to both ports. The destination node will receive (fault-free state) two identical frames. To avoid additional burden on the CPU processing, the first frame is forwarded to the application layer and the second frame discarded. To provide the necessary seamless switchover performance, duplicated packet processing must be implemented at the hardware layer.
Our EtherREL technology provides a hardware-assisted implementation for common industrial redundancy protocols, such as HSR. Network reliability is boosted with LinkMD® + diagnostics, in addition to traditional fault monitoring, providing an embedded Signal Quality Indicator (SQI) for determining dynamic link error margin. Quiet-WIRE® enhanced EMI technology delivers industrial-strength physical layer reliability in the harshest environments, even when operating over low-cost unshielded cabling.