Apparatus for locating faults in a carrier subscriber communicat

Details Apparatus for locating faults in a carrier subscriber communicat Apparatus for locating faults in a carrier subscriber communicat

1984-12-10

1987-02-10

Schreyer, Stafford D.

Multiplex communications

Wide area network

Packet switching

178 69R, 178 69G, 379 4, H04B 160, H04B 346

Patent

active

046424261

ABSTRACT:
Method and apparatus is disclosed for identifying faults in a subscriber carrier telephone system utilizing out-of-band pilot signals and comprising pluralities of cables and repeaters that are alternately connected in series between carrier equipment at a central office location and a subscriber station. Equipment at the office location transmits selected numbers of test pulses, having a test frequency that is between the transmitted and received channel and pilot frequencies, to the first cable. The pulses are detected at the first repeater and counted. A microprocessor is responsive to the test pulse count in the repeater for initiating associated tests on the cable and/or repeater, or for retransmitting test pulses onto the next cable to the next repeater for causing it to perform designated tests. The results of the tests are sent to the office equipment in the form of reply pulses having a frequency that is below the lowest channel frequency.

REFERENCES:
patent: 3904827 (1975-09-01), Blok
patent: 3909563 (1975-09-01), Ghosh et al.
patent: 4006320 (1977-02-01), Markl
patent: 4025737 (1977-05-01), Brewer
patent: 4161634 (1979-07-01), Bellisio
patent: 4319080 (1982-03-01), Kuwahara
patent: 4355215 (1982-10-01), Legras et al.

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