| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To effect cut return suitable for restoring a condition of communication path, in which barrier is generated. <P>SOLUTION: When a number of times of continuous fail of reception of an answer signal to a route confirmation signal transmitted for the confirmation of condition of a main route 2 upon selecting the main route 2, a selected communication route is switched from the main route 2 into a detour route 3 and, on the other hand, when the number of continuous reception of answer signal is more than a previously set cut return threshold value upon selecting the detour route 3, the selected communication route is switched from the detour route 3 into the main route 2 and the response signal is received after the answer signal is not continuously received by the number of times not more than a switching threshold value, the cut return threshold value is set at a value higher than the present cut return threshold value. <P>COPYRIGHT: (C)2009,JPO&INPIT</p> |
