Multiplex communications – Wide area network – Packet switching
Patent
1992-04-09
1996-01-02
Marcelo, Melvin
Multiplex communications
Wide area network
Packet switching
370 8514, 370 8515, H04L 1246
Patent
active
054815380
ABSTRACT:
Frame processing apparatus, and a related method for its operation, for use in a station connected to a token ring network, to ensure rapid stripping of frames from the network without reference to source addresses in the frames, and in spite of the possible presence of extraneous no-owner frames on the network. The adverse effects of extraneous no-owner frames are avoided by any of three techniques. First, transmitted information frames are preceded by a start strip delimiter frame and followed by an end strip delimiter frame. The process strips all incoming frames (except tokens and ring initialization frames, which are specially handled), but does not count the stripped frames until the start strip delimiter frame is detected. Therefore, extraneous frames preceding the transmitted information frames will be stripped but not counted, and all of the transmitted frames will be stripped. In another approach, an estimated stripping time is used to terminate stripping. Frame counters are not then needed and extraneous frames will be stripped prior to the desired information frames. A third approach is to preset the transmitted frame count to some selected value, so that more frames will be stripped than were transmitted. Thus, preceding extraneous frames will be stripped, but the end strip delimiter will still terminate stripping and preclude overstripping.
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Ramakrishnan K. K.
Spinney Barry
Yang Henry S.
Dagg David A.
Digital Equipment Corp.
Johnston A. Sidney
Marcelo Melvin
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