| 摘要 |
PURPOSE:To improve the reliability of the system without necessity to use a spare transmission line by automatically switching an own station transmission line from an own station inserting data line to an own station receiving data line and bypassing data when a fault is generated. CONSTITUTION:When a fault generation signal is applied to an electromagnetic coil 11c in the case of the fault such as power supply interruption or the like, a normal signal is removed from the coil 11c, there is no magnetic field, and a prism 11a is moved in an arrow direction. Therefore, the data from an own station inserting line 13 is shielded by a reflecting face 11a2 of the prism 11a and is not transmitted to a transmission line 312 but the received data from a reception line 311 is reflected on a reflecting face 11a1 and transmitted to the line 312 so as to execute a bypass operation. Thus; it is not necessary to use the spare transmission line in the case of the fault, the data can be transmitted without affecting another communication node device, and the reliability of the system is improved. |
