| 摘要 |
PURPOSE:To output an alarm signal notifying the generation of a slip in a prescribed timing by allowing a slip control means to control plane switching forcibly in a timing other than the timing of plane switching by means of a switching signal generating means. CONSTITUTION:A timing signal synchronizing with the plane switching operation at the data readout of a double buffer memory is inputted to a slip control means 131. When the timing signal and a frame pulse outputted from a phase shifting means 111 reach a prescribed phase relation, the forced plane switching is instructed. Then an alarm signal to inform the plane switching is fed to a switching signal generating means 121 and an alarm collecting section. Thus, an alarm signal informing the production of a slip is outputted in a prescribed timing. |
