Method and apparatus for managing contention in a self-routing switching architecture in a port expansion mode
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United States of America Patent
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Jan 29, 2002
Grant Date -
N/A
app pub date -
Jul 24, 1998
filing date -
Dec 30, 1997
priority date (Note) -
Expired
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Abstract
A method and apparatus for managing contention in a self-routing switching architecture based on a set of n.times.n individual switching structures that are connected in a port expansion mode by means of fan-out and fan-in circuits providing access of the Switch Core Access Layer (SCAL) to the different input and output ports of the switching core. The fan-in circuits use an arbitration mechanism for providing a token to the switch that is allowed to deliver the next cell and the arbiter operates from a detection of a special comma character in accordance with the 8B/10B coding scheme which is introduced in the data flow between the individual switching structures and the fan-in circuits. This provides a compensation for the difference in transfer delays of the cells even when high switching speed and long length of the physical media are involved.
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