Method of communication using a two-way bus with contention dete

Details Method of communication using a two-way bus with contention dete Method of communication using a two-way bus with contention dete

1992-04-24

1994-06-07

Chin, Wellington

Multiplex communications

Wide area network

Packet switching

370 943, 359118, 359136, H04J 1408

Patent

active

053196422

ABSTRACT:
A communication system using a two-way bus capable of detecting contentions from nodes other than nodes concerned in communication to ensure confidentiality of communication. A plurality of nodes are connected to a two-way multiple access bus. A transmitting node first monitors the multiple access bus for contention detection before transmission and then transmits a packet only when the bus is not busy. The transmitting node further monitors the multiple access bus for a predetermined time period even after the start of transmission. In the meantime, a receiving node transmits an answer after a predetermined wait time upon reception of the packet addressed to itself. Assuming that the maximum two-way propagation delay time of the multiple access bus is .tau..sub.0, the predetermined time period during which the transmitting node monitors the multiple access bus after the start of transmission for contention detection is .tau..sub.1, and the wait time between the reception of the packet by the receiving node and the start of transmission of the answer is .tau..sub.2, such that the relationship .tau..sub.0 <.tau..sub.1 <.tau..sub.2 is satisfied.

REFERENCES:
patent: 4894819 (1990-01-01), Kondo et al.
patent: 5237696 (1993-08-01), Best
Fibernet: Multimode Optical Fibers For Local Computer Networks, E. G. Rawson et al., IEEE Transactions On Communications, vol. Com-26, No. 7, Jul. 1978, pp. 983-990.

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