Interconnecting a synchronous switching network that utilizes a common time reference with an asynchronous switching network
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United States of America Patent
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Apr 23, 2002
Grant Date -
N/A
app pub date -
Jul 22, 1998
filing date -
Jun 11, 1998
priority date (Note) -
Expired
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Abstract
This invention describes a method for exchanging timing messages and data packets between switches of a network with a common time reference, and between end stations and switches of such a network, over an asynchronous sub-network. The method entails transmission of messages conveying the common time reference, and data packets that are sent responsive to the timing information and predetermined scheduled time intervals. The switches of the network maintain a common time reference, which is obtained either from an external source (such as GPS-Global Positioning System) or is generated and distributed internally. The time intervals are arranged in simple periodicity and complex periodicity (like seconds and minutes of a clock).
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