摘要 |
<P>PROBLEM TO BE SOLVED: To provide a communication system and apparatus employing a redundancy configuration in transmission line and without affecting selection of an operation system and a non-operation system in a communication section employing the redundancy configuration by line quality of other communication section. <P>SOLUTION: A transmitter 3 inserts a prescribed test pattern into an undefined area of a transmission frame, compensates difference of parity by insertion of the test pattern and transmits the test pattern to the respective transmission lines with the redundancy configuration. A receiver 4 extracts reception frames from the respective transmission lines from the transmitter 3, inserts a fixed pattern in the undefined area instead and compensates the difference of the parity by insertion of the fixed pattern. In addition, the receiver 4 counts the number of code errors of the test pattern and determines which transmission line among the respective transmission lines is used as the operation system from a counting result. <P>COPYRIGHT: (C)2004,JPO |