Call meter signal receiver for subscriber's private metering...

Details Call meter signal receiver for subscriber's private metering... Call meter signal receiver for subscriber's private metering...

H - Electricity

04

M

379/37

H04M 15/28 (2006.01) H04M 15/34 (2006.01)

Patent

CA 1259432

ABSTRACT OF THE DISCLOSURE A call meter signal receiver for a subscriber's private metering (SPM) system operated by a call meter signal sent from a central office (CO). The receiver is operable both by common mode and normal mode signals. The receiver is so small that it can be installed in a central office trunk (COT) of the PBX. The call meter signal receiver is composed of a frequency tuned receiver and two buffer circuits, the first one for receiving the common mode and the second one for receiving the normal mode signal. The first buffer circuit is connected to the input side of a hybrid circuit of the COT and has a high impedance, while the second buffer circuit is connected to one of the output terminals of the hybrid circuit for receiving the normal mode signal and has high impedance for voice signals. The outputs of these buffer circuits are fed to the frequency tuned receiver composed of a phase locked loop (PLL) the frequency of which is tuned to 50 Hz, 12 kHz or 16 kHz by switching externally attached circuit composed of capacitor and resistors.

532419

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