| 摘要 |
PURPOSE:To form a by-pass route speedily at the time of trouble occurrence by connecting the negative-side terminal of a main line at a switching position and one of two terminals of a 1st loop line, and the other-side terminal and one of two terminals of a 2nd loop line respectively. CONSTITUTION:The negative-side terminal 12a of the main line 12 at the switching position and one of two terminals 13a and 13b of the 1st loop line 13, and the other terminal 12b and one of two terminals 14a and 14b of the 2nd loop line 14 are connected. Thus, the terminals are connected to form a by-pass route from the 1st loop line 13 to a trouble point of the main line 12 through a switching node 15 and a by-pass route from a station 11 to the main line 12 through the 2nd loop line 14 and switching node 15. Consequently, a break of communication at the time of the trouble occurrence can be prevented. |
