Frame erasing method for token ring networks without last frame

Details Frame erasing method for token ring networks without last frame Frame erasing method for token ring networks without last frame

1989-01-31

1990-07-10

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 854, H04J 314

Patent

active

049411420

ABSTRACT:
In a token ring transmission method wherein a plurality of nodes are interconnected in a ring form by a transmission path through which information are sent as frames in one direction, a right-to-send in said transmission path is obtained by a sender node of said nodes that holds a token to be sent to said transmission path, and the format of said frames does not have any field to indicate the last frame sent in each capture of said token, the improvement comprises the steps of: additionally sending an identification frame specific to said sender node from said sender node to the downstream node after information frames were sent from said sender node to said downstream node; sending said token from said sender node to said downstream node after said identification frame specific to said sender node was sent; at said sender node, erasing said frames that have traveled round said transmission path and returned to said sender node, irrespective of source addresses of said frames and without relaying said frames to sid downstream node; and when said sender node detected said specific identification frame, stopping said erasing step.

REFERENCES:
patent: 4507777 (1985-03-01), Tucker et al.
patent: 4539679 (1985-09-01), Bux et al.
patent: 4566097 (1986-01-01), Bederman
patent: 4674086 (1987-06-01), Szczepanek et al.
patent: 4792947 (1988-12-01), Takiyasu et al.

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