| 摘要 |
PURPOSE:To measure a correct code error rate by stopping automatically the code error rate measurement of out-of-synchronism period when it is detected that a device to be measured is in the state of out of synchronism. CONSTITUTION:A synchronous state discriminating circuit 1 discriminates the synchronism state of a communication device to be measured at each burst and transmits the result as a synchronism discriminating signal to a code error rate measuring circuit 2 via a changeover switch SW. The circuit 2 executes the measurement of the code error rate of a receiving signal series inputted from a terminal (a) at each burst based on the signal from the circuit 1. That is, the circuit 1 outputs the synchronism discriminating signal and takes the burst only discriminated as the synchronism state as the measurement objective. Since the code error rate measurement is not executed for the burst when the communication device to be measured is out of synchronism, the circuit 2 measures only the code error rate at the synchronous state of the communication device to be measured at all times. |
