| 摘要 |
<p>Optical signals are switched to reduce device scale, perform efficient recovery from trouble and improve system expandability and communication quality. Overhead termination means (1) converts an optical signal into an electric signal and carries out overhead processes that include extracting trouble information and status information and setting. Optical switch means (2) switches between the current and auxiliary lines by switching an optical signal. Switch control means (3) instructs the optical switch means (2) to switch based on trouble information.</p> |
