| 摘要 |
PURPOSE:To omit or simplify a protection circuit by providing a circuit detecting a transmission code rule violation and a means discriminating a time slot with a specific location in a frame. CONSTITUTION:A circuit applying the transmission code rule violation simultaneously to transmission codes of specific m-set (m<=l) of transmission lines among l-set (l>=2) of transmission lines 41-44 to send a digital data is parallel is provided, and when the number of circuits detecting the transmission code rule violation and the number of transmission lines detecting the transmission code rule violation are a specific value (n) (n<=m) or over of the same time slots at the reception side of the m-line of transmission lines, a means discriminating the time slot as the specific location in the frame is provided. Since the probability of mis-frame or mis-synchronization is decreased in such a way, the protection circuit is omitted or simplified. |
