THREE-PORT BACKUP DEVICE FOR RING COMMUNICATION NETWORK Russian patent published in 2013 - IPC H04L12/28 H04L12/70 

FIELD: radio engineering, communication.

SUBSTANCE: three-port backup device (1) has a data packet switch (2) connected to a port (3) for connecting to an intelligent electronic device, and with two ports (4) for connecting to a ring communication network, and a clock synchronisation unit (5). The unit (5) is connected to outputs of receivers (6), (7) and inputs of transmitters (8) and (9) for connecting to the ring communication network, the output of a receiver (10) for external synchronisation and the input of a transmitter (11) for connecting to an intelligent electronic device. The unit (5) is configured to generate a clock signal which is synchronised by output signals of receivers with introduction of a fixed delay of the output signal for the receiver, transmitting the generated signal to inputs of transmitters, and transmitting signals between receivers and transmitters. The three-port backup device is provided with a configuration interface (12) capable of assigning receivers and transmitters a synchronisation signal, delay values of output signals of receivers and allowing or prohibiting transmission of signals between receivers and transmitters.

EFFECT: high accuracy of clock synchronisation of devices connected to a ring communication network in the automation system of a power facility in accordance with the IEC 61850 standard, particularly class T5.

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