Method of accessing local area networks with a unidirectional ri

Details Method of accessing local area networks with a unidirectional ri Method of accessing local area networks with a unidirectional ri

1987-12-23

1989-06-20

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 94, H04J 326

Patent

active

048415235

ABSTRACT:
A method of accessing a local-area network which allows transmission on a unidirectional ring, of circuit-switched or packet-switched communications organized in hybrid frames, in which overlapping between the beginning of a frame and a residual of the preceding frame which is still to reach its destination is avoided without reporting to a rigid band allotment to the indiviual communications and to a network synchronization system, where a well defined node acts as a master clock. According to the method the individual nodes of the network, access in sequence the transmission line in each frame, maintaining the same order of asynchronous access in the circuit and packet regions. To avoid overlapping between adjacent frames, in the packet region of each frame, starting from an instant preceding by a predetermined time period the end of the frame, the packet transmission by the node which has the right of access at the instant or by the nodes which would have the right of access from that instant to the end of the new frame, is disabled. y

REFERENCES:
patent: 4538263 (1985-08-01), Gabrielli et al.
patent: 4569041 (1986-02-01), Takeuchi et al.
patent: 4663758 (1987-05-01), Lambarelli et al.
patent: 4718061 (1988-01-01), Turner

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