Fault direction in an optical communications system

Details Fault direction in an optical communications system Fault direction in an optical communications system

H - Electricity

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325/1

H04L 5/14 (2006.01) H04B 10/00 (2006.01) H04B 10/24 (2006.01) H04J 3/06 (2006.01) H04J 3/14 (2006.01)

Patent

CA 1276236

ABSTRACT FAULT DIRECTION in an OPTICAL COMMUNICATIONS SYSTEM An optical duplex system may continue to operate after a break in a fibre if light is reflected at the break and received back at the transmitting station, and that station is unable to identify the origin of the data. To prevent this, in a simple 2-channel duplex system, data transmitted from one end is inverted prior to transmission and reinverted at the receiving end, while information from the other end is transmitted and received without inversion. If there is a break, the stations at both ends will receive inverted data and the fault is quickly revealed. In a 2x4 channel multiplex system, one channel from one end is inverted before transmission, whilst three channels from the opposite end are inverted before transmission.

541743

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