As a special nature of transmission scheme, what is the basic of DVI optical fiber? which is the DVI signal has its particularity in the transmission process: that is because the data code flow too fast, making Transmission distance is limited, for example, to 1600 × 1200 × 60, according to the provisions of 5 meters can be transmitted in the current practical application, it can be completed about 7 meters; to 1280 × 1024 × 70, the transmission of 10 meters is feasible.
Of course, choose a better cable, 1024 × 768 × 75 can reach 13-14 meters. In single-stage transmission, the primary issue is the problem of driving ability, that is, the problem of "walking alone", but at the same time, there is still a problem of distorted signal waveform distortion even over digital signals over long distances. After the transmission capacity is increased, the waveform of the signal is greatly distorted. The received signal at the receiving end shows an error on the judgment of "0" and "1". From the display, there is a "wrong point". When the dot is too large, the display will fail, that is no longer displayed. In fact, when the DVI signal is transmitted long distances, as the distance increases, what is observable on the display is: Good → False → More False → Fail. It may be "walking indefinitely" caused signal failure, it cannot transmit to display, it also may be "go move", but too many "wrong point" to display failed.
Through the optical module and optical fiber to send and receive, it can achieve the DVI high-definition multimedia signal transmission over long distances. Through different distance optical modules to achieve the farthest up to 60KM long-distance transmission.
DVI signal principle is displayed RGB digital signal which is processed in the graphics card and the HV signal combination, according to the minimum non-return-to-zero to be coded, make each pixel click as 10hit digital signal to parallel--serial conversion, transmit the encoded R.G.B digital stream and pixel clock signal in accordance with the TMDS TMDS mode, each stream rate is 10 times than the original pixel clock. For example 1024 × 768 × 70 resolution, the pixel clock is 75MHZ, The code stream clock 75MHz x10, it is 0.75GHZ. The general DVI code stream is between 0.24GHZ to 1.65GHZ.
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