Time synchronization master station and remote station system
First Claim
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1. 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 comprising:
- a master station transmitter means for generating a master station time message,a master station time clock having actual time of day information,a holding register connected with said transmitter means and connected with the master station time clock for holding the actual time of day information indicated by said clock at the time a predetermined portion of the time message is sent and in which the contents 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 clock to be adjusted to be the same time as the master station time clock having actual time of day information,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, anda summation device connected to said receiver means and connected to have an output to said remote time clock and having inputs connected to said holding register and said counter so that the time portion of 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 rate of the remote station base rate clock 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 clock as the current updated actual time of day.
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Accused Products
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.
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Citations
2 Claims
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1. 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 comprising:
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a master station transmitter means for generating a master station time message, a master station time clock having actual time of day information, a holding register connected with said transmitter means and connected with the master station time clock for holding the actual time of day information indicated by said clock at the time a predetermined portion of the time message is sent and in which the contents 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 clock to be adjusted to be the same time as the master station time clock having actual time of day information, 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 clock and having inputs connected to said holding register and said counter so that the time portion of 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 rate of the remote station base rate clock 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 clock as the current updated actual time of day. - View Dependent Claims (2)
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Specification
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Current AssigneeSiemens Power Transmission & Distribution Incorporated (Siemens AG)
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Original AssigneeControl Data Corporation (Ceridian HCM Holding, Inc.)
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InventorsVangen, Robert F.
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Primary Examiner(s)Caldwell, Sr., John W.
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Assistant Examiner(s)Crosland, Donnie Lee
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Application NumberUS06/180,243Time in Patent Office676 DaysField of Search340/694-696, 340/309.1, 340/151, 340/152 R, 340/152 T, 340/147 SY, 340/870.02, 340/870.03, 340/870.04, 340/870.13, 340/870.14, 368/47, 375/106, 375/110, 375/114, 179/6 TAUS Class Current368/47CPC Class CodesG04G 7/00 Synchronisation radio-contr...H04J 3/0664 unidirectional timestampsH04J 3/0697 Synchronisation in a packet...H04Q 9/00 Arrangements in telecontrol...
