公衆通信回線による標準時供給システム

概要

論文の詳細を見る
A time data transmission system has been developed to transfer accurate standard time, by using public telephone line. This system consists of a time data transmission unit and a time data receiver unit, which are mutually connected with the telephone line via MODEM. We have developed the following methods for the delay time compensation in the telephone line. (1) The transmission unit sends the standard time data, and the end of this transmission data is synchronized with the standard second signal, and (2) The time data receiver measures the delay time in telephone line by using MODEM's loop back technology, and the local clock time is corrected to the standard time data. The experimental test on an actual line has comfirmed as a field data that its accuracy of time adjustment is kept within i 200 μs. Furthermore, this system can be fully automated including synchronizing process and be able to send the time data to general purpose terminal such as personal computer.
社団法人日本時計学会の論文
1992-09-25