| 摘要 |
PURPOSE:To protect properly transmission line errors to reduce the delay quantity due to a continuous protecting circuit by providing a continuous protecting means and a parity check means and synchronizing plural asynchronous signals by the multipoint sampling method to perform time division multiplex transmission. CONSTITUTION:The frame constitution shown in the figure is used. A parity check circuit 11 check the parity in accordance with channel bits A-G and a parity bit P in a frame unit; and if a parity error is detected, the state of a signal line 12 is set to '0', and a frame clock is applied to an AND gate 43 through a signal line, and it is controlled by the output of the circuit 11 to stop the output to a double continuous protecting circuit 1, and the write of the frame, where the error occurs, in registers 3 and 4 is inhibited to hold the signal before the error. Thus, the signal of the error frame is excluded.
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