DEVICE AND METHOD FOR SWITCHING AND CONTROLLING TRANSMISSION LINE

摘要

PROBLEM TO BE SOLVED: To prevent the occurrence of line switching at the time of maintenance work. SOLUTION: When normal operation is performed, a switching mode selecting part 25 is made to operate so that a control signal autonomously generated by an automatic switching and controlling part 22 can be supplied to transmission line switching parts 21a to 21d. Also, in the case maintenance and inspection are carried out such as when a failure takes place, a switching mode selecting part 25 is made to operate so that control signals generated by a manual switching and controlling part 24 in accordance with the connection state of a circuit set by a user can collectively be supplied to the parts 21a to 21d.