Telephone network coupler
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
Feb 23, 1988
Grant Date -
N/A
app pub date -
Apr 8, 1985
filing date -
Apr 8, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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