| 摘要 |
PROBLEM TO BE SOLVED: To provide a train radio system with which an unexpected off-hook state can be easily and speedily avoided by issuing an alarm to a certain on- vehicle station according to a simple instruction from a commander when the hand set of the on-vehicle station unexpectedly keeps the offhook state. SOLUTION: When a hand set confirmation button is pressed at the commander, a hand set confirmation command is transmitted from a central unit to all the on-vehicle stations. At the on-vehicle state where the hand set is unexpectedly turned to the off-hook state, the hand set confirmation command is validated, transmission is forcedly stopped after a reception command is transmitted to a base station connected through a radio line, the lamp of the abnormal off-hook indication button is turned on, and an alarm tone is generated. Since the lamp of the hand set confirm button is flickered at the commander where the reception command is received, it is conformed that the hand set of the on-vehicle station is in the off-hook state. |
