Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1981-06-15
1983-11-15
Schreyer, Stafford D.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
324 52, H04B 346
Patent
active
044157797
ABSTRACT:
Methods and a system of this invention are used to determine whether a fault in a subscriber loop is located between a telephone central office and a reference point or between the reference point and subscriber terminal equipment without opening the loop. Included in the system are two current interrupter networks one of which is connected in series with the tip conductor and one in series with the ring conductor. If a fault exists between the central office and the reference point, the application of a test signal causes a constant current reading on a meter at a test center. On the other hand, if a fault is present in the loop beyond the reference point, an oscillatory current reading appears on the meter. The system also includes a recognizable impedance termination network which is connected between the tip and ring conductors of the subscriber loop to facilitate testing for opens in the tip and ring conductors.
REFERENCES:
patent: 3636280 (1972-01-01), Wetzel
patent: 3892929 (1975-07-01), Shylo
patent: 3990764 (1976-11-01), Krymreich
patent: 4054759 (1977-10-01), McGrath et al.
patent: 4109112 (1978-08-01), Denman
patent: 4148539 (1979-04-01), Hardesty
patent: 4215381 (1980-07-01), Heisinger
Advertisement of Proctor & Associates; Telephony, Feb. 25, 1980, p. 50.
Advertisement of Melco Labs; Telephony, Mar. 10, 1980.
Advertisement of Tii Industries; Telephone Engineer and Management, Jun. 15, 1979.
Advertisement of Cidcomm; Telephony Aug. 13, 1979, p. 65.
Schreyer Stafford D.
Somers E. W.
Western Electric Company Inc.
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