| 摘要 |
PURPOSE:To cause sampling periods of time at respective terminal stations to coincide accurately with each other through a simple constitution and without requiring any adjustment by setting the time relation of a signal transmitted through two transmission routes in a specific state, by computing the transmission delay time between said terminal stations through using a difference in the time of arrival of a signal, and by automatically conducting a sampling synchronism control. CONSTITUTION:The sampling oscillator of a synchronism master station 2 gives a transmission means one transmission reference signal for each sampling simultaneously with a sampling time TS and sends a signal including current data 1A of its station, a reciprocating transmission delay time tLP and a sampling synchronous flag to a transmission route 12. Said signal reaches a branch station 3 after a transmission delay time t12, then current data 1B are added thereto, and thereafter arrives at a branch station 4 through a track 13. Said branch station 4 conducts control, so that its sampling time precedes the time of arrival T4R of a signal gong from the master station by (t12+t13). Thus, said branch station 4 can perform sampling at the same time TS as that of the synchronous master station 2. |
