Subscriber's connecting network comprising a symmetrical...

Details Subscriber's connecting network comprising a symmetrical... Subscriber's connecting network comprising a symmetrical...

H - Electricity

04

M

379/67

H04M 19/00 (2006.01) H04M 19/02 (2006.01)

Patent

CA 1132275

19.3.79 1 PHF 78513 ABSTRACT: Subscriber's connecting network comprising a symmetrical power amplifier for feeding a subscriber's line. Subscriber's connecting network comprising a symmetrical power amplifier which is formed by two pairs of complementary transistors. Resistors having the same values are arranged in collector circuits of the tran- sistors of the symmetrical amplifier for limiting the current in the subscriber's line. In addition, means are present for making the base voltage dependent on the col- lector voltage of this transistor so that a predetermined voltage is present between these two electrodes in the normal direction of operation: finally a by-pass capaci- tor for the speech currents in the subscriber's line is arranged between two input terminals of the symmetrical amplifier. The invention is particularly suitable for a network in which binary signals are used for the genera-- tion of ringing signals and metering signals in the sub- scriber's line.

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