SYNCHRONIZING CHANGING CONTROL METHOD

摘要

PURPOSE:To synchronously control respective changing timings with the transmission/ reception timings of changing signals as reference in node devices at both ends of a changing section by deciding the upper limit of the cumulative re-transmission time of the changing signals over the entire changing section, informing the node device for receiving about the changeover signals of the number of times of cumulative re-transmission and absorbing synchronization errors accompanying the re-transmission. CONSTITUTION:The node device 11e of a transmission destination detects the number of times of the cumulative re-transmission, calculates a waiting time from receiving the changing signals until changing is performed corresponding to the cumulative re-transmission time obtained from the number of times of the cumulative re- transmission and sets it at a timer for the changeover. That is, the maximum cumulative re-transmission time obtained from the maximum number of times of the cumulative re-transmission is added in the set value of the timer for the changeover in the node device 11b for transmitting the changing signals and a value for which the actual cumulative re-transmission time obtained from the number of times of the cumulative re-transmission is subtracted from the maximum cumulative re-transmission time is defined as the set value of the time for the changeover in order for the node device 11e to perform synchronizing changing with the node device 11b.