| 摘要 |
Radio working lines 14 1W... are provided to correspond to optical lines 13 1W... and a single radio standby line 14 p is provided. An optical-line failure detecting unit 22 monitors occurrence of failure in each of the optical lines, and a radio-line failure detecting unit 24 monitors the occurrence of failure in each of the radio working lines. When occurrence of failure in an optical line 13 1W... has been detected, a relief-rank management unit 25 reduces the relief priority level of the radio working line corresponding to this optical line below the priority levels of radio working lines corresponding to optical lines that have not failed. When a failure has occurred in two or more radio working lines, a line changeover controller 26 transmits data, which is to be sent to a radio working line that failed, via the radio standby line 14 p . Alternatively, or additionally, priority levels are varied in accordance with line condition (unit 21) and/or redundancy configuration. |
