Fault locating apparatus for digital transmission system

Details Fault locating apparatus for digital transmission system Fault locating apparatus for digital transmission system

H - Electricity

04

B

340/76

H04B 7/15 (2006.01) H04L 1/24 (2006.01)

Patent

CA 1108261

FAULT LOCATING APPARATUS FOR DIGITAL TRANSMISSION SYSTEM Abstract of the Disclosure Defective repeaters in a multihop, digital microwave transmission systems are located by the use of a special test pattern which is generated at the transmitting terminal. At each repeater station, the two outputs of the phase demodulator are compared to determine if the test pattern has been properly received from the upstream repeaters. The special test pattern, S, has the characteristic that Image ; that is to say, the test pattern equals the complement of itself delayed by 2N symbols. This special characteristic makes it unnecessary to employ a differential decoder in the test apparatus at each repeater station. - i -

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