Multiplex communications – Wide area network – Packet switching
Patent
1987-03-09
1989-03-28
Leung, Philip H.
Multiplex communications
Wide area network
Packet switching
34082505, 34082579, 34082585, 370 86, H04Q 1104, H04Q 300
Patent
active
048170828
ABSTRACT:
A switching arrangement comprising a crossbar array of crosspoint elements where each column of crosspoint elements, is associated with its own control ring mechanism. The enabling of the individual crosspoint elements of a column and the subsequent transmission of packets are effected rapidly in response to a token, e.g., a single enable bit, that is circulated on the associated control ring. Contention delays between packets are eliminated by passing the token during, rather than after, packet transmission. Upon receipt of a token bit at a crosspoint element, the crosspoint element is enabled while concurrently the token is passed to the next crosspoint element.
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American Telephone and Telegraph Company AT&T Bell Laboratories
Evans Geoffrey S.
Leung Philip H.
Watland Ross T.
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