| 摘要 |
In a communication apparatus and the like, the line diagnosis using a test signal is conducted with higher precision. A test signal transmitter generates a test signal for a line diagnosis to feed the signal to a test signal multiplexer. The multiplexer multiplexes the test signal with a main signal to deliver the resultant signal to a clock and data regenerator (CDR) module, a main signal transmitter, a main signal receiver, a test signal separator, and a test signal receiver that are arranged on a communication line through which the main signal is transferred. In the operation, a controller accomplishes a control operation such that the bit rate of the test signal is more than that of signals for communication to thereby intentionally cause bit errors. This improves precision in the measurement of the bit error rate required for the line diagnosis.
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