| 摘要 |
PURPOSE:To automatically switch a system without missing the timing of a switching by detecting a system-down due to the hardware of the system to be composed of a main system and a sub-system through a health checking channel and switching the system and a line. CONSTITUTION:When a main system 1 goes to be down while keeping health check disability, the down is detected by a down detecting circuit 71 and informed to a switching device 5. The switching device 5 to receive the information informs a sub-system 2 of preparation to be the main system through system switching channels 41 and 42. Simultaneously, the switching device 5 immediately instructs the switching to a line switching device 6 and executes the switching of the system interlocked with the switching device 5. Thus, a duplexing system switching system can be obtained so as to prevent a time delay. |
