Telephone line interface

Details Telephone line interface Telephone line interface

H - Electricity

04

M

379/11

H04M 7/16 (2006.01)

Patent

CA 1207475

Abstract of the Disclosure A telephone line interface which performs the BORSHT func- tions employs pulse width modulation and eliminates dc in the transformer to reduce the size of the coupling transformer thereby reducing space and costs. The ring function is pro- vided to the subscriber without use of mechanical relays. An automatic, dynamically adjusted hybrid network is provided for removing echo signals thereby providing major improvement in two-to-four wire conversion performance. The circuitry lends itself to large scale integration thereby reducing space and cost and improving reliability. . .

452657

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