System for generating a time reference value in the MAC layer of an ISO/OSI communications model among a plurality of nodes
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United States of America Patent
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Jan 31, 1995
Grant Date -
N/A
app pub date -
Oct 31, 1991
filing date -
Oct 31, 1991
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A Time Reference Manager for providing a time reference value to the nodes of a ring topology local area network. A time reference is implemented on a distributed system data bus at a low level interface to provide highly accurate time reference values at each node of the LAN with no settling time required. One node on the network is designated as the Time Reference Manager and broadcasts the Time Reference Protocol data around the ring of the LAN network. Time delay correction is provided by an algorithm performed in a time reference software process. Clock accuracy is selectable by the number of bits used in the clock-counter.
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