| 摘要 |
PURPOSE:To prevent the noise by digital signal from being intruded into analog signal, by wiring at least one of analog and digital signal lines with optical fiber wires. CONSTITUTION:At the back of the PCM terminal station, electric signal wires are used for the analog signal wires 11, 12 wired to the plugs 2 to 8 at the upper stage of the frame 1, and optical fiber wires are used for the digital signal wires 13, 14 wired between the plugs 9, 10 at the lower stage and the plugs 2 to 8. Digital signal is converted into optical signal. With this constitution, even if analog signal wires 11, 12 and digital signal wires 13, 14 are mixed complicatedly, no error and no deterioration of S/N can never be made due to noise of digital signal on analog signal. |
