Telecommunications line interface circuits

Details Telecommunications line interface circuits Telecommunications line interface circuits

H - Electricity

04

M

379/66

H04M 9/08 (2006.01) H04B 1/58 (2006.01)

Patent

CA 1293832

TELECOMMUNICATIONS LINE INTERFACE CIRCUITS Abstract of the Disclosure A two-wire telephone line interface circuit includes two transformers each having primary and secondary windings. The primary windings, which are divided into equal halves for balance and d.c. feed purposes, are connected in series between the two wires, and the winding resistances together with optional series resistance provide desired d.c. resistance across the line. To this end one or both of these windings may comprise resistance wire. A signal from a receive line is coupled to the two-wire line via an amplifier whose low output impedance terminates the secondary of one of the transformers. Another amplifier couples a signal from the two-wire line and the secondary of the other transformer to a transmit line, and also provides at its input a transhybrid signal cancellation node, a transhybrid signal being coupled thereto via a balance impedance. A feedback path can be provided for increasing the a.c. impedance presented by the interface circuit to the line. A four-wire telecommunications line interface circuit using similar transformers is also described. - i -

588590

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