Multiplex communications – Wide area network – Packet switching
Patent
1990-05-21
1993-02-02
Kuntz, Curtis
Multiplex communications
Wide area network
Packet switching
370 941, 34052552, H04Q 1104, H04J 0324
Patent
active
051843463
ABSTRACT:
A switching system exchanges communication information as fixed length cells between a plurality of incoming and outgoing highways. The fixed length cells each have a plurality of data portions with one data portion designated as a header portion for containing switching information. An address generating circuit generates read addresses and write addresses in response to the header portion of each cell and a control circuit. The plurality of cells from the incoming highways are simultaneously rotated in a rotation matrix with each of the cell's data portions rotated to a unique internal path. The data portions are then transmitted to identical write addresses in a plurality of memories via delay circuitry. The write addresses are transmitted through shift registers to the plurality of memories to allow the data portions of a single cell to occupy identical addresses within a plurality of memories. The control circuitry determines the correct outgoing highway for each cell based upon information contained within the header portion of each cell or a routing table. The data portions are then read out of read addresses in the plurality of memories and rotated by another rotation matrix. The rotated data portions reform the fixed length cell along a determined outgoing highway.
REFERENCES:
patent: 4603416 (1986-07-01), Servel et al.
patent: 4910731 (1990-03-01), Sakurai et al.
Yoshito Sakurai, et al., "A Study on an Integrated Switching Network", National Convention Record in Commemoration of the 70th Anniversary of the Foundation of The Institute of Electronics, Information and Communication Engineers of Japan, 1987, Switching Division 1832, pp. 8-91. An English translation is unavailable to applicants' attorney.
Amada Eiichi
Asano Kenichi
Endo Noboru
Kozaki Takahiko
Ogino Mineo
Ghebretinsae T.
Hitachi , Ltd.
Hitachi VLSI Engineering Corporation
Kuntz Curtis
Link Laboratory Inc.
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