Automatic circuit switching device restorable without a hit and

Details Automatic circuit switching device restorable without a hit and Automatic circuit switching device restorable without a hit and

1993-11-29

1995-09-05

Nguyen, Hoa T.

Excavating

371 201, 370 16, 39520001, 379 2, G06F 1100, H04J 302

Patent

active

054485738

ABSTRACT:
This unit is an automatic circuit switching device which performs synchronization of a regular circuit and a stand-by circuit to achieve switch back operation from the stand-by circuit to the regular circuits without any hit or short break of data transmission when the regular circuit is restored. Detectors 14.sub.1, 14.sub.2 output an instruction signal to establish a stand-by circuit when regular circuit 2 becomes disconnected and output an instruction signal to start comparison of synchronization when regular circuit 2 is restored from the disconnection, based on the results of monitoring of the signals. Terminal adapter circuits 15.sub.1, 15.sub.2 establish stand-by circuit 4 based on the instruction signal to establish the stand-by circuit and output switching instruction. Comparators 18.sub.1, 18.sub.2 control delay circuits 16.sub.1, 16.sub.2, 17.sub.1, 17.sub.2 based on the comparison start instruction and output switch back instruction when the above synchronization is achieved. Switching circuits 19.sub.1, 19.sub.2 transmit the output signals from delay circuits 17.sub.1, 17.sub.2 to the corresponding subscriber terminals based on the switching over instruction and transmit the output signals from delay circuits 16.sub.1, 16.sub.2 to the corresponding subscriber terminals based on the switch back instruction.

REFERENCES:
patent: 4477895 (1984-10-01), Casper et al.
patent: 4529842 (1985-07-01), Levy et al.
patent: 4686675 (1987-08-01), Morimoto et al.
patent: 5187706 (1993-02-01), Frankel et al.
patent: 5210740 (1993-05-01), Anzai et al.

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