Detecting a DC nonlinearity terminating a network

Details Detecting a DC nonlinearity terminating a network Detecting a DC nonlinearity terminating a network

1983-07-20

1985-02-26

Schreyer, Stafford D.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

1791753R, 179 18AB, 324 62, H04M 124

Patent

active

045019355

ABSTRACT:
A methodology for identifying a telephone receiver-off-hook (ROH) condition within the class of resistive faults occurring on a subscriber line is disclosed. The method utilizes the nonlinear DC characteristic exhibited by an off-hook handset. First and second DC resistances are measured in response to first and second DC sources applied at a test point associated with the line. A resistance differential between the two resistances is compared to a resistance range. A ROH condition is indicated if the differential falls within the range.

REFERENCES:
patent: 4034161 (1977-07-01), Hoppough
patent: 4034162 (1977-07-01), Holt
patent: 4298969 (1981-11-01), Rickenbacker
"Locating Cable Faults", Charles A. Maloney, IEEE Transactions on Industry Applications, Jul.-Aug. 1973, pp. 380-394.

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