| 摘要 |
PURPOSE:To obtain the trunk test circuit with ease of maintenance and small sized circuits, by picking up the communication signal for test at digital telephone exchanger as PCM audio data and converting it into analog audio data as required. CONSTITUTION:Audio PCM data of CH to be tested and designated at the channel CH designation circuit 12 of to tested of a trunk test device 11 is connected to a PCM modulation and demodulation circuit 13 via branch insertion circuit 17 between time sharing multiplex separation circuit 4 and digital switch network TDSW5 or branch insertion circuit 18 between PCM trunk 6 and TDSW5. Further, the DC line signal to the analog trunk circuit 1 corresponding to the designated CH of the circuit 12 and the CH to be tested to the trunk 6, is connected to the line signal transmission/reception circuit 15 of the device 11 via the signal transmission/ reception control circuit 7 or PCM trunk control circuit 9. The CH to be tested is designated from the test panel 16 and the audio data of the CH to be tested is connected to the jack of the test panel 16 for test. |
