| 摘要 |
PURPOSE:To simplify the configuration of a switchboard by providing the switchboard with transmitting and receiving buffer memories and connecting a pulse feeding circuit for generating time slot pulses corresponding to the specified time slot numbers assigned to the encoder and decoder sides and the transmitting and receiving highway sides of said buffer memories. CONSTITUTION:A controlling device 3 selects idle time slots on transmitting and receiving highways 5, 6 individually in response to a calling request of a telephone set 1 and outputs the selected time slot numbers to memories 25a, 25b through a control circuit 20 to store the numbers in the memories. A coincidence circuit 26a generates a strobe signal when a counter 27 counting clocks CLK indicates the time position corresponding to the time slot stored in the memory 25A. Consequently a voice from the telephone set 1 is sent to an encoder 23 and shift registers 28a, 28b successively. When the coincidence circuit 26b generates a strobe pulse at the time of the time slot of the memory 25b, a signal is sent from the register 28b to the transmitting highway 5. The signal on the receiving highway 6 is sent to the telephone set 1 through registers 29b, 29a and an decoder 24 reversely against said direction. |
