Electronic loaded/nonloaded telephone loop identification...

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

G - Physics

01

R

324/58.02

G01R 31/00 (2006.01) H04B 3/26 (2006.01)

Patent

CA 1131709

ELECTRONIC LOADED/NONLOADED TELEPHONE LOOP IDENTIFICATION CIRCUIT Abstract of the Disclosure 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 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 to the impedance measuring circuit so that a capacitor held reference signal can be set before each loop identification operation.

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