| 摘要 |
PURPOSE:To attain data transmission without losing the relation of position between data and a frame signal by transmitting the data with a frame signal in-phase with a normal phase signal up to the time when the error of a prescribed level takes place. CONSTITUTION:A CMP 3 discriminates the result of phase comparison between a frame signal F in the normal state from an optical module and a frame signal F' from a CNT 2 to be an error. TIM 4 outputs a signal representing the error for a prescribed time. SEL 1 selects the signal F in a normal state from the optical module and the CNT 2 generates the frame signal F' in phase with the signal F and outputs it. The signal F' is sent to the CMP 3, in which the phase of the signal is compared with that of other input signal F. When the result of comparison shows coincidence, TIM 4 outputs a signal representing no error to the SEL 1. Thus, SEL 1 selects the signal F' and sends it to CNT 2, from which the signal F' is outputted. |
