| 摘要 |
PURPOSE:To simplify the circuit and to correspond to various automatic response, by forming a digital automatic response circuit with a transmission circuit and reception circuit transmitting and receiving digital signals and a circuit program- controlling both the circuits. CONSTITUTION:A digital automatic response trunk DAAT consists of a digital signal transmission and reception section SND and RCV and a programmable control circuit MD and contains signals into a digital switch network TDSW via digital multiplex and sepration circuits MPX, DMPX. An automatic transmission measuring device ATTM of the station A transmits a test call and a signal via exchanger SW, trunk TRK and line L. In the station B, the signals are in A/D conversion at a PCM coder CODEC via the trunk TRK and they are inputted to a digital automatic response trunk DAAT via a digital exchanger DSW, and the measurement of the characteristics can be made by transmitting and receiving signals with an automatic transmission measuring device ATTM of the station A through the control instruction of a programmable control circuit MP. Thus, the device can be simplified. |
