Loop transmission system and method of controlling the...

Details Loop transmission system and method of controlling the... Loop transmission system and method of controlling the...

H - Electricity

04

L

340/73

H04L 1/00 (2006.01) H04B 1/74 (2006.01) H04L 1/24 (2006.01) H04L 12/437 (2006.01)

Patent

CA 1196976

LOOP TRANSMISSION SYSTEM AND METHOD OF CONTROLLING THE LOOP-BACK CONDITION THEREOF ABSTRACT OF THE DISCLOSURE A loop transmission system and a method of con- trolling the loop-back condition thereof. The loop transmission system comprises a plurality of node stations, a supervisory station, and two duplicate loop transmission lines which transmit signals in opposite directions. In the loop transmission system, the supervisory station first sends out loop-back commands via both of the duplicate loop transmission lines when faults are detected on both of the duplicate loop transmission lines at the same time. Each of the node stations establishes a loop-back path while retaining a connection path to a succeeding node station upon the receipt of a loop-back command. The loop-back path is released only in the node stations which receive signals normally from both of the duplicate loop transmission lines when the supervisory station sends release commands to the node stations after sending the loopback commands.

434837

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