| 摘要 |
PURPOSE:To simply attain the channel path check of a transmission section by using a 1st test signal so as to allocate a channel test signal to a DSI channel, inserting a 2nd test signal to a channel time slot to be tested actually and using said signal so as to apply time check. CONSTITUTION:A 1st test signal inserting means 11 inserts the 1st test signal to a predetermined time slot of a digital voice multiplex signal string. Then the 2nd test signal is inserted to the channel time slot with the 1st test signal inserted thereto when the 1st test signal is at a high level. As the 2nd test signal, a test pattern where the input/output pattern of ADPCM is clarified is prepared and it is stored in a ROM, and the 2nd test signal read from the ROM is used for checking the channel path of the DSI/ADPCM while the 1st test signal is set. Thus, the system can check even up to the ADPCM in comparison with a conventional system which checks only the DSI part.
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