| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a node unit and a state notice information acquiring method in which, the possibility of malfunction is eliminated. SOLUTION: In the case the number of frame synchronization protection stages for the transmission signal is m (m is a natural number) and the number of protecting stages for the state notice information is n (n is a natural number), when the expression n<=m<n×2 holds, the contents shown in the state notice information corresponding to a k-th stage (where k is a natural number fulfilling the expression n<=m<n×2) frame, using time X as a reference are regarded as valid among the contents shown in the state notice information protected over n stages, using time X as a reference. Here, the time X is the time, when Out of Frame occurred. As a result of protecting m stages using time X as a reference, when Out of Frame of the transmission signal has been sensed, the contents shown in the state notice information corresponding to at least the (n+1)th stage frame and later, using the time X as a reference are regarded as being invalid among the contents shown in the state notice information protected over n stages, using the time X as a reference.</p> |
