CA1136864A
Expired / Lapsed
CA
⏱️ 0.0 years remaining
Time synchronization master station and remote station system
Assignee: Control Data Corp
•
Filing: 1981-04-21
•
Granted: 1982-12-07
•
Expires: 2001-04-21
Abstract
Abstract A time synchronization system involves a master station sending time information to a remote station and in which a portion of the time message is used as a trigger to start a counter or interval clock in the remote station. When the time message is concluded, the remote station adds the time in the interval clock or counter to the time from the message received to create an actual time which replaces the existing time information in the remote station clock. The time portion of the message sent represents the actual time at which the trigger in the time message was actuated and represents a later portion of the message as sent.
Inventors
- 👤 Robert F. Vangen
Bibliographic Details
Application Number
—
Jurisdiction
CA
Data Source
google_patents
Last Synchronized
2026-10-30 08:22
CPC Classifications
H; H04; H04J; H04J3/00; H04J3/02; H04J3/06; H04J3/0635; H04J3/0638; H04J3/0658; H04J3/0661; H04J3/0664; G; G04; G04G; G04G7/00; H04Q; H04Q9/00; H04J3/0685; H04J3/0697
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
291 words
A time synchronization system comprising a master station and a remote station so that the actual time of day information in a remote station clock can be adjusted to be the same as the master station time clock compris-ing: a master station transmitter means for generating a master station time message, a master time clock, a holding register connected with said transmitter means and connected with the master time clock for holding the time indicated by said clock at the time a predetermined portion of the time message is sent and in which the con-tents of said holding register are sent as the time portion of the time message at a time subsequent to the predetermined portion of the time message, a remote station receiver means for receiving a time message, a remote station time register, a remote station base rate clock, a counter connected to said base rate clock and adapted to receive a control signal from said receiver means, a time information holding register adapted to receive a time message from said receiver means, and a summation device connected to said receiver means and connected to have an output to said remote time register and having inputs connected to said holding register and said counter so that the time portion or said time message is entered into said holding register by said remote station receiver and so that said counter is actuated to count at the remote station clock base rate commencing at the predetermined portion of the time message received; wherein, at the conclusion of said time message the summation device adds the contents of said holding register and said counter and enters them into the remote station time register as the current updated actual time of day.
Claim 2
Dependent Claim
291 words
A time synchronization system comprising a master station and a remote station so that the actual time of day information in a remote station clock can be adjusted to be the same as the master station time clock compris-ing: a master station transmitter means for generating a master station time message, a master time clock, a holding register connected with said transmitter means and connected with the master time clock for holding the time indicated by said clock at the time a predetermined portion of the time message is sent and in which the con-tents of said holding register are sent as the time portion of the time message at a time subsequent to the predetermined portion of the time message, a remote station receiver means for receiving a time message, a remote station time register, a remote station base rate clock, a counter connected to said base rate clock and adapted to receive a control signal from said receiver means, a time information holding register adapted to receive a time message from said receiver means, and a summation device connected to said receiver means and connected to have an output to said remote time register and having inputs connected to said holding register and said counter so that the time portion or said time message is entered into said holding register by said remote station receiver and so that said counter is actuated to count at the remote station clock base rate commencing at the predetermined portion of the time message received; wherein, at the conclusion of said time message the summation device adds the contents of said holding register and said counter and enters them into the remote station time register as the current updated actual time of day.
Claim 3
Dependent Claim
123 words
The system of claim 1 wherein said master station is further comprised of: a remote station time register for receiving the remote station time, a remote station base rate clock, a counter connected to said base rate clock and adapted to receive a control signal from said remote station, a tim difference register, means for determining the difference in time between said master time clock and the remote time contained in said remote station time register and entering said difference into said time difference register, means for generating an offset time from the contents of said time difference register, and means for summing said offset time to the contents of said holding register for future time transmissions to compensate for transmission time delay.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.