Apparatus and method for communicating data between a plurality

Details Apparatus and method for communicating data between a plurality Apparatus and method for communicating data between a plurality

1990-08-14

1992-05-05

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 858, 370 859, 370 952, H04J 302

Patent

active

051114569

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 (111) 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).

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Bell System Technical Journal, vol. 61, No. 7, Part 1, Sep. 1982, pp. 1413-1440, J.O. Limb et al., "Description of Fastnet-A Uni-Directional Local Area Communications Network".

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