Telephone network coupler

Multiplex communications – Wide area network – Packet switching

Patent

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Details

250551, 379379, 455602, H04B 900

Patent

active

047275359

ABSTRACT:
An analog coupling device for coupling a telephone to a telephone network circuit while maintaining isolation of the two circuits has an optical emitting element and an optical receiving element in the network circuit. The telephone circuit includes an optical receiving element optically coupled with the network circuit optical emitting element. The telephone circuit optical receiving element has a reversed biased pn junction. The telephone circuit further includes an optical emitting element which is optically coupled with the network optical receiving element.

REFERENCES:
patent: 4056719 (1977-11-01), Waaben
patent: 4133982 (1979-01-01), Lee et al.
patent: 4243890 (1981-01-01), Miller et al.
patent: 4282604 (1981-08-01), Jefferson
patent: 4365164 (1982-12-01), Siblex
patent: 4558183 (1985-12-01), Corris et al.

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