| 摘要 |
The present invention relates to a communication method which prevents the loss of frames by transmitting frames efficiently through a different bypass line when a transmission line is interrupted in communications using a ring topology. The purpose of the present invention is to provide a seamless ring topology communication method which enables stable communications without switchover time in ring topology communications. [Reference numerals] (AA) Receive ring MAC frame from East;(BB) Control frame;(CC) Transmit ring MAC frame to MCU along with received port number;(DD,II,KK) Discard packet;(EE,HH) Received RMAC = self RMAC?;(FF,LL) Transmit ring MAC frame to West;(GG) User frame;(JJ) Previously received packet?;(MM) Remove ring MAC header;(NN) Transmit user frame to Host |
