A method of detecting the presence of load coils on...

Details A method of detecting the presence of load coils on... A method of detecting the presence of load coils on...

H - Electricity

04

M

H04M 1/24 (2006.01) G11B 23/00 (2006.01) H04B 3/26 (2006.01) H04B 3/46 (2006.01) H04M 3/26 (2006.01) H04M 3/30 (2006.01)

Patent

CA 2258404

A method for determining whether a subscriber loop has load coils comprises applying test tones in the voice band to a hybrid circuit terminating the subscriber loop at the transmitter pair of the four-wire side of the circuit. Reflections are measured at the receiver pair of the four-wire side of the hybrid circuit. If the amplitude of the reflections as a function of frequency decrease monotonically, the subscriber loop is declared to be free of load coils.

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