| 摘要 |
PURPOSE:To perform effective line exchange and information transmission and reception without malfunction, by making unnecessary the write-in to the data area of exchanger through suitable transmission of power supply application information and line close information. CONSTITUTION:The central control unit CC1 and the peripheral control unit 4 are tied with the clock signal line 6, and transmission and reception buses 7a, 7b for information transmission and reception, and the communication memory 8 is tied with each converter 3 via the PCM transmission and reception buses 9a, 9b for audio signal transmission and reception. The unit 4 inputs the hook-on, hook-off signal from the telephone sets and dial signal and delivers various information signals to CC1 via the bus 7a according to the predetermined format and receives the data of CC1 via the bus 7b. Further, the close information and power supply application information are delivered with the flag circuit built-in. The communication between telephone sets connected with the lens connection work of the unit 4 is once stored in the memory 8 via the buses 9a, 9b, and it is made after the conversion processing. |
