Multiplex communications – Wide area network – Packet switching
Patent
1983-07-08
1985-07-16
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370103, H04Q 1104
Patent
active
045300917
ABSTRACT:
A packet switching system in which a remote real-time clock is accurately synchronized to a standard real-time clock via X.25 (CCITT) controlled high-speed transmission links. Synchronization is achieved by the transmission of an interrupt packet and a data packet between a remote processor controlling the remote real-time clock and an administrative processor controlling the standard real-time clock. Synchronization involves the following steps: (1) assembling an interrupt packet comprising the least significant bits of the remote real-time clock for transmission to the administrative processor by the remote processor, (2) calculating bits representing the difference between the transmitted least significant bits of the remote real-time clock and the least significant bits of the standard real-time clock by the administrative processor, (3) assembling a data packet comprising bits representing the state of the standard real-time clock and the difference bits for transmission to the remote processor by the administrative processor, (4) adding the difference bits to the bits representing the state of the remote real-time clock by the remote processor, and (5) adding a predefined value to the most significant bits of the remote real-time clock by the remote processor if the transmitted least significant bits of the standard real-time clock are numerically greater than the least significant bits of the remote real-time clock.
REFERENCES:
patent: 3861134 (1975-01-01), Chacon et al.
patent: 4142069 (1979-02-01), Stover
patent: 4253181 (1981-02-01), Watten
patent: 4339817 (1982-07-01), Hata et al.
1979 Proceedings of 1st International Conference on Distributed Computing Systems, IEEE, Oct. 1-5, 1979, Illinois, "Setting Clocks `Back` In A Distributed Computing System", pp. 612-616.
AT&T Bell Laboratories
Moran John C.
Olms Douglas W.
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