Communications: electrical – Continuously variable indicating – With meter reading
Patent
1985-11-18
1988-10-18
Griffin, Robert L.
Communications: electrical
Continuously variable indicating
With meter reading
34082505, 370 85, 370 86, 455 58, H04Q 500, H04J 302, H04B 700
Patent
active
047790881
ABSTRACT:
Local area networks having a plurality of stations connected to a transmission medium in a daisy chain configuration at the nodes or endpoints experience difficulty in detecting collisions between signals transmitted from two or more stations using standard Manchester violation or lost carrier collision detection techniques. The present invention eliminates collision detection problems in this environment almost entirely by monitoring the signal level coupled from the transmission medium to each station of the daisy chain to detect the presence or absence of collisions and generating a collision detection output signal when the signal level being monitored exceeds a predetermined threshold level.
REFERENCES:
patent: 4384363 (1983-05-01), Lipcon
patent: 4390990 (1983-06-01), Ainsworth
patent: 4412347 (1983-10-01), Lipcon
patent: 4476467 (1984-10-01), Terwilliger et al.
patent: 4531238 (1985-07-01), Rawson et al.
patent: 4649548 (1987-03-01), Crane
Modern Dictionary of Electronics, 5th Edition; Rudolf F. Graf; p. 169; 1977.
American Telephone and Telegraph Company
AT&T Information Systems Inc.
Griffin Robert L.
Ranieri Gregory C.
Smith Ralph E.
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