TRANSMISSION SYSTEM

摘要

When a first communication device receives a specified message through a third line from a second communication device in the state where a frame is error correction coded and transmitted in a first line, the first communication device switches to a second line and continues transmission after the frames of the message are transmitted after switching to the first line. When the second communication device receives and error corrects the frames from the first and second lines, and stores the frames after error correction in first and second buffers; and when the second communication device transmits the specified message to the third line if a line switch was judged to be necessary based on the error correction state of the frames received from the first line, and receives the frames of the message after switching from the first line, the second communication device starts to read out the frames from the second buffer after all of the frames stored in the first buffer have been read out.