Relays with process bus based applications use IEEE 1588

edition 2 for high-accuracy time synchronization.

For redundant Ethernet communication in station bus, the relay

offers either two optical or two galvanic Ethernet network

interfaces. An optional third port with optical or galvanic

Ethernet network interface is also available. The relay also

provides an optional fiber-optic port for dedicated protection

communication which can be used for up to 50 km distances

depending on the selected fiber transceiver. The intended

teleprotection applications for this port are line differential and

line distance protection communication or binary signal

transfer. The optional third Ethernet interface provides

connectivity for any other Ethernet device to an IEC 61850

station bus inside a switchgear bay, for example connection of

a remote I/O. Ethernet network redundancy can be achieved

using the high-availability seamless redundancy (HSR) protocol

or the parallel redundancy protocol (PRP), or with a self-healing

ring using RSTP in the managed switches. Ethernet

redundancy can be applied to the Ethernet-based IEC 61850.

Modbus and DNP3 protocols.