Pulse or digital communications – Spread spectrum – Direct sequence
Patent
1992-06-19
1994-07-05
Chin, Stephen
Pulse or digital communications
Spread spectrum
Direct sequence
370 8515, 370105, H04L 700, H04J 322, H04J 312
Patent
active
053274687
ABSTRACT:
The operating system clocks in each station on a counter rotating ring network of a distributed processing system are synchronized by latching the count in a free running counter in the network interface of each station at the instant a clock message transmitted by a timekeeper station is received. The timekeeper station then calculates from its operating system time-of-day clock and its free running counter, its time of reception of the clock message, and broadcasts this timekeeper time of reception to the other stations. Each other station calculates its own time of reception from its operating system time of day, and the count in its free running counter, and uses the difference between its time of reception and the timekeeper time of reception to correct its operating system time-of-day clock. Repeater and media propagation delays determined from the dynamic topography of the network are taken into account in calculating the correction factor. The free running counter can also be used to maintain a higher resolution local time of day than is available from the operating system time-of-day clock.
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Crew Albert W.
Edblad Warren A.
Staab Carl J.
Chin Stephen
Le Amanda T.
Watkins P. C.
Westinghouse Electric Corp.
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