| 摘要 |
PURPOSE:To detect the collision of signals regardless of delay time cost for receiving a transmission signal, by discriminating that signal collision exists in a transmission line when it is detected that the signals do not satisfy a prescribed code rule. CONSTITUTION:A photodetector 30 inputting an optical signal converts the optical signal into an electric signal and an amplifier 31 amplifies this electric signal. The output of the amplifier 31 is discriminated and reproduced at a discrimination reproducing device 32 and a timing extraction circuit 33. The output of the discriminating reproducing device is inputted to a collision detecting circuit 34. Since ''00'', ''01'' arrive alternately in reference to the CMI code rule in general, the signal collision is detected by detecting the disturbance of the interchangeability at a collision detecting circuit 34. |
