| 摘要 |
PURPOSE:To secure the high-efficiency time-division exchange of the code decoder, by storing both the analog signal receiver and the sender into the common code decoder. CONSTITUTION:Both push-button dial signal PB register 3 and PB sender 4 are contained into common 4-wire type code decoder 10. Then register 3 and sender 4 are connected to the analog signal output and input terminals each of decoder 10. In addition, calling subscriber's telephone 1 is connected to the digital input time slot of decoder 10 via time-division channel 8, and at the same time line wire 6 is connected to the digital output time slot of decoder 10 via channel 7 respectively. As a result, register 3 and sender 4 have the independent working with no interference to each other, ensuring the high-efficiency time-division exchange. |
