| 摘要 |
PURPOSE:To contrive the reduction of power consumption and the circuit scale by converting a multiplexed input signal data into a parallel signal data having a low frequency and taking frame synchronization. CONSTITUTION:An optical signal received from an optical fiber is converted into an electric signal by a light receiving section 1 and sent to a serial/parallel conversion section 3. A multiplexed data is divided into a prescribed number at the conversion section 3 and converted into plural low frequency signals and outputted to an ordering line circuit to take frame synchronization and the result is outputted to a parallel/serial conversion section 5. On the other hand, one of the clocks frequency divided into a prescribed number (n) is outputted via a delay circuit 4 and the other is outputted via an n-fold multiplier circuit 6 and fed to the conversion section 5 to restore the low frequency signal to the original signal. In this case, since the leading part of the clock of the output of the multiplier circuit 4 is added to nearly the middle point of the 1/n clock, the clock is made stable. |
