Unidirectional bus system using reset signal

Details Unidirectional bus system using reset signal Unidirectional bus system using reset signal

1992-01-06

1993-12-14

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 8512, 370 8515, H04J 316

Patent

active

052710084

ABSTRACT:
A communications system has a plurality of stations (S.sub.1, S.sub.2 . . . S.sub.N) interconnected by a pair of lines (10,11) so that one line (10) permits the stations (S.sub.1, S.sub.2 . . . S.sub.N) to transmit in one direction and the other line (11) permits transmission in the other direction. Frames each having a control field and a data field pass down the lines (10,11) and each station (S.sub.1, S.sub.2 . . . S.sub.N) can write a packet of data to any frame in which the data field is empty. This is signalled by a busy bit in the control field. The stations (S.sub.1, S.sub.2 . . . S.sub.N) are arranged to write data packets in cycles. The commencement of such a cycle for writing to signals on one line (10,11) is determined by a signal on the other line (11,10). That signal may be constituted by a suitable reset bit in the control field of a frame. Preferably, once the cycle of a station (S.sub.1, S.sub.2. . . S.sub.N) commences, it is temporarily inhibited from being recommenced by a reset signal on the other line (11, 10). The system may be implemented in folded and dual bus embodiments.

REFERENCES:
patent: 4532626 (1985-07-01), Flores et al.
patent: 5001707 (1991-03-01), Kositpaiboon et al.
patent: 5111456 (1992-05-01), Limb
D. H. C. Du et al., "A New Access Protocol for Uni-Directional Twin-Bus Architectures," IEEE Infocom, New Orleans, pp. 805-812, Mar. 1988.
J. O. Limb et al., "Description of Fastnet--A Uni-Directional Local Area Communications Network," Bell System Technical Journal, vol. 61, No. 7, Part 1, pp. 1413-1440, Sep. 1982.

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