FOUR-PORT BACKUP DEVICE FOR COUPLING OF CIRCULAR NETWORKS OF COMMUNICATION NETWORK Russian patent published in 2013 - IPC H04L12/28 H04L12/70 

FIELD: radio engineering, communications.

SUBSTANCE: four-port backup device (FPBD), comprises two switchboards (2) of data packets, every of which is connected to the other switchboard (2) and with two ports (3 and 4), designed for connection into the first and second circular communications networks, and a clock synchronisation unit (5). To the unit (5) the outlets of two receivers (6) and (7) are connected, as well as inlets of two transmitters (8) and (9), designed for the first circular network, outlets of two receivers (10 and 11), inlets of two transmitters (12 and 13), designed for the second circular network, and the outlet of the receiver (14) of the external synchronisation signal. The unit (5) is made as capable of generation of a clock signal synchronised with output signals of receivers with introduction of a fixed delay of an output signal for each receiver, issue of a generated signal to inlets of transmitters, and as capable of translation of output signals of receivers to inlets of transmitters designed for the identical network. The device is equipped with a configuration interface (15) as capable of setting the receivers and transmitters of the synchronising signal, delay values of output signals of receivers and permit or prohibition of transmission of output signals of receivers to inlets of transmitters.

EFFECT: improved accuracy of clock synchronisation.

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