| 摘要 |
PURPOSE:To constitute a simple and inexpensive local network system by performing frame synchronism by means of a vertical synchronizing signal of an NTSC synchronising signal and performing slot synchronism by means of a horizontal synchronising signal for interconnection between a terminal device and a processor. CONSTITUTION:A synchronizing generator 11 is connected to one end of a coaxial cable 13 functioning as a data transmission medium and a terminator 12 is connected to the other via a data bus respectively. A cable inserting device 14 supplying access to the coaxial cable 13 is equipped with the cable in the state of in-line in order to prevent impedance mismatching and its effect. The cable access from four sets (1-4) of tap devices 15 is supplied by the insertion of the cable. The synchronism generator 11 generates the NTSC synchronizing signal, the vertical synchronizing signal conducts frame synchronism and the horizontal synchronizing signal performs slot synchronism to allocate the time slot thereby attaining transmission of information by means of time division multiplex system. |
