Solid state line circuit for a key telephone system

Details Solid state line circuit for a key telephone system Solid state line circuit for a key telephone system

1974-10-15

1976-04-20

Robinson, Thomas A.

H04M 100

Patent

active

039521699

ABSTRACT:
This solid state line circuit employs transistors, diodes, optical couplers, triacs, and other solid state components but no relays. It is designed to replace line cards in key telephone systems. This design utilizes semiconductors that are the "state of the art" such as optical couplers, SCRs and Triacs to replace relays. The circuit achieves the isolation and breakdown voltages required where other designs have failed.

REFERENCES:
patent: 3676608 (1972-07-01), Goldthorp et al.
patent: 3764752 (1973-10-01), Yachabach
patent: 3766325 (1973-10-01), Hatfield et al.

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