| 摘要 |
PURPOSE:To ensure the loop monitor, the detection of the ring trip signal and others via the common signal process sytem by giving the signal process to the detection signal after the analog multiplication and the digital conversion. CONSTITUTION:The analog signal is extracted out of terminal a1 of voltage/current converter 7 and then supplied to analog multiplying unit 11. Unit 11 gives the cyclic switching to the analog signal from plural number of subscriber circuits via the selection signal sent from signal process circuit 13, and then sends out the analog signal to circuit 13 after A/D conversion 12. Circuit 13 processes the digital signal which is supplied periodically. And the loop monitor, the detection of the ring trip signal and others can be carried out through circuit 13 which performs the common signal process. |
