Telegraphy – Miscellaneous
Patent
1986-08-14
1987-12-22
Schreyer, Stafford D.
Telegraphy
Miscellaneous
178 2R, 375 36, 333119, H04B 303
Patent
active
047148020
ABSTRACT:
A direction sensitive coupling unit, and method of operation, is disclosed for use in a communication medium to indicate the presence and source direction of transmissions. A directional coupler is provided for receiving information signals from first and second directions along the medium and for providing an attenuated information signal as its output wherein the attenuation to information signals received from the first direction is greater than the attenuation to signals received from the second direction. A voltage sensitive indicating circuit is coupled to the medium and is adapted to respond to the coupler output for providing a digital indication of the presence and source direction of transmissions on the medium.
REFERENCES:
patent: 3048798 (1962-08-01), Simons
patent: 3716806 (1973-02-01), Zelenz
patent: 4032911 (1977-06-01), Melvin, Jr.
patent: 4411004 (1983-10-01), Graham
patent: 4517670 (1985-05-01), Ulug
patent: 4649535 (1987-03-01), Ulug
Allowed U.S. patent application Ser. No. 802,482 entitled "Method and Apparatus for Maintaining a Dynamic Logical Ring in a Token Passing LAN", M. E. Ulug, including 2/9/87 amendment thereto.
Burgujian Richard V.
Davis Jr. James C.
General Electric Company
Schreyer Stafford D.
Webb II Paul R.
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