Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Patent
1986-11-17
1987-08-18
Sikes, William L.
Telecommunications
Receiver or analog modulated signal frequency converter
Signal selection based on frequency
350 9610, 350 9616, 350 9620, H04B 900
Patent
active
046882669
ABSTRACT:
In a car data transmission device installed in cars to transmits data through the cars by means of optical fibers, optical fiber lines for data transmission are provided to be looped in duplex through a row of cars; each of cars is provided with optical fiber cables, each receiving therein the duply looped optical fiber lines as one unit whose data transmitting direction different each other; and jointing optical fiber cables are placed between the adjacent cars to pass the duply looped optical fiber lines as one unit received in the optical fiber cable placed in each of the adjacent cars whereby interruption of the data transmission lines is prevented even though a trouble of transmission such as breaking of one of the jointing optical cables occurs.
REFERENCES:
patent: 4090067 (1978-05-01), Bell, III et al.
patent: 4190821 (1980-02-01), Woodward
patent: 4276643 (1981-06-01), Laprie et al.
patent: 4317614 (1982-03-01), Palmer
patent: 4446551 (1984-05-01), Seo
patent: 4506357 (1985-03-01), Nakayashiki et al.
"Fiber Optic Communications Loop" by Balliet, IBM Technical Disclosure Bulletin, vol. 27, No. 1B, Jun. 1984.
Morihara Kenji
Ochiai Hajime
Mitsubishi Denki & Kabushiki Kaisha
Sikes William L.
Ullah Akm E.
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