Electronic loaded/nonloaded telephone loop identification circui

Details Electronic loaded/nonloaded telephone loop identification circui Electronic loaded/nonloaded telephone loop identification circui

1979-03-12

1980-09-23

Robinson, Thomas A.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

179 18FA, 324 57R, H04M 322, G01R 2700

Patent

active

042244838

ABSTRACT:
An electronic loop identification circuit identifies loaded and nonloaded customer telephone loops. The loops can then be segregated to allow separate balance networks to be used for hybrid circuits which connect the customer loops to a digital switching office. Separate balance networks for loaded and nonloaded loops improve singing margin on those loops. An impedance measuring circuit (214) measures the real part of the impedance of a connected loop which is compared to a reference signal. If the real part of the loop impedance is greater than the reference signal, a loaded loop is identified; and, if the real part of the loop impedance is less than the reference signal, a nonloaded loop is identified. The circuit includes a self-calibrating arrangement which connects a reference impedance (209) to the impedance measuring circuit so that a capacitor (304) held reference signal can be set before each loop identification operation.

REFERENCES:
patent: 3283242 (1966-11-01), Oliver
patent: 3284705 (1966-11-01), Dobson
patent: 3612993 (1971-10-01), Tims

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