| 摘要 |
PURPOSE:To prevent the transmission efficiency at the generation of disturbance from being deteriorated by arranging a supervisory station detecting an error detection of a reception frame and transmitting it as an idle frame at defective detection and a general terminal station transmitting and receiving the frame only. CONSTITUTION:A master station 10 applying synchronism control on a loop, an error frame supervisory station 30 detecting a code error due to disturbance of transmission line and transmitting a frame of defective detection as an idle frame and general terminal stations 20, 40 are connected in a loop to constitute the transmission system. Further, terminal devices 50-80 are connected to the stations 10-40. The error frame supervisory station 30 feeds a delay the received frame in the own station to attain error detection. The general stations 20, 40 transmit the reception frame as it is. Thus, the reception efficiency is not decreased even at the generation of disturbance and the transmission delay time of the loop is prevented. |
