Multiplex communications – Wide area network – Packet switching
Patent
1987-07-09
1989-05-23
Griffin, Robert L.
Multiplex communications
Wide area network
Packet switching
455606, 455607, 455612, 455617, H04B 900
Patent
active
048336688
ABSTRACT:
An optical duplex system may continue to operate after a break in a fibre if light is reflected at the break and received back at the transmitting station, and that station is unable to identify the origin of the data. To prevent this, in a simple 2-channel duplex system, data transmitted from one end is inverted prior to transmission and reinverted at the receiving end, while information from the other end is transmitted and received without inversion. If there is a break, the stations at both ends will receive inverted data and the fault is quickly revealed. In a 2.times.4 channel multiplex system, one channel from one end is inverted before transmission, while three channels from the opposite end are inverted before transmission.
REFERENCES:
patent: 3546384 (1970-12-01), Brigham
patent: 4087818 (1978-05-01), Kreutal
patent: 4326287 (1982-04-01), Abramson
patent: 4618952 (1986-10-01), Bochor
Electronics Letters, vol. 21, No. 14, 4th Jul. 1985, pp. 628-629, London, GB; Hall et al: "Bidirectional Transmission Over 11 km of Single Mode Optical Fibre at 34 Mbit/s Using 1.3 mum LED's and Directional Couplers".
Coombs Gregory P.
Rowley Robin
Beek Leslie Van
British Telecommunications public limited company
Griffin Robert L.
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