Multiplex communications – Wide area network – Packet switching
Patent
1984-12-10
1987-04-14
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
379 4, 379 6, 379 26, H04J 116, H04J 314
Patent
active
046583955
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 on the next cable to the next repeater for causing it it 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: 3739098 (1973-06-01), Camiciottoli et al.
patent: 4161634 (1979-07-01), Bellisio
patent: 4319080 (1982-03-01), Kuwahara
patent: 4355215 (1982-10-01), Legras
Cannon Russell A.
Chin Wellington
Gilbert Douglas M.
GTE Communication Systems Corporation
Olms Douglas W.
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