Contention-type data communication system

Details Contention-type data communication system Contention-type data communication system

1984-04-30

1986-04-22

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

3408255, H04J 302, H04Q 300

Patent

active

045846782

ABSTRACT:
A contention-type data communication system such as an optical star-configured network comprises a plurality of stations connected with one another through data bus. To detect a signal collision quickly, each of the stations is arranged to transmit a collision-detecting packet which has a predetermined time length T.sub.1 and a predetermined pulse pattern, and then transmit a data packet after a time interval T.sub.2. The number or pattern of pulses received during a time period T.sub.1 +T.sub.2 from the start of reception of a collision-detecting packet is compared with that of the self-transmitted collision-detecting packet so that the signal collision is detected when noncoincidence occurs.

REFERENCES:
patent: 3796992 (1974-03-01), Nakamura et al.
patent: 4380088 (1983-04-01), Lipcon
patent: 4380761 (1983-04-01), Boggs
patent: 4409592 (1983-10-01), Hunt
Computer Design, vol. 21, No. 12, Dec. 1982, pp. 32, 37, Winchester, U.S.; "Factory Environment Fiber Optic LAN Provides Emi Immunity, Increases Security".
Local Networks Strategy & Systems, Mar. 1983, pp. 223-238, Northwood, GB; A. Colvin: "CSMA with Collision Avoidance, A New Technique for Cost Reduction", pp. 232-237, paragraphs 5-7.
"Fibernet II: An Active Star-Configured Fiber-Optic Local Computer Network with Data Collision Sensing", OFC'82, Tuff 1; E. G. Rawson et al; Apr. 1982.
Annual Meeting of IECE, Japan, "A Study on Data Collision Detection Circuit for Optical Star Networks", No. 341; K. Oguchi et al; Aug. 1982.

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