Multiplex communications – Wide area network – Packet switching
Patent
1993-06-01
1994-07-05
Safourek, Benedict V.
Multiplex communications
Wide area network
Packet switching
370 8513, H04L 1242
Patent
active
053274318
ABSTRACT:
To improve the throughput of bridges in a multiple ring token ring network, External Copy Hardware (ECH) is provided for each source routing bridge to determine when a frame is to be copied as a candidate for forwarding to another ring by a given bridge. Each frame may contain a Routing Information Field (RIF), which the ECH searches for Segment Numbers in the RIF that are compared with host processor developed Primary Segment Numbers (each representing a primary ring number and a bridge number) and Secondary Segment Numbers (each representing an alternate ring number and a bridge number). The ECH uses the results of the comparisons along with a look-up table and a Routing Control Word (also present in the RIF) to determine if the frame under consideration is to be copied by a Protocol Handler (which interfaces with the ECH) and forwarded by the corresponding bridge to another ring. During the process of making a copy or non-copy decision, the frames are scanned unidirectionally, and the decision is made "on the fly", thereby increasing operation speed.
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Heske, III Theodore
Kulik Peter J.
Gadson Gregory P.
Martin Paul W.
NCR Corporation
Safourek Benedict V.
Ton Dang
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