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I have seen these adapters "Mini-DVI graphics extension via Cat 5e/6" online from here.

Looking at the specs of DVI-D it requires 18 conductors minimum. The adaptor uses a single ethernet cable of 4 pairs (8 conductors) total.

I have exhausted searches online to find out how on earth such a device works. Magic? I'm seeking any input or some kind of diagram that shows how this works.

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  • if you vote down, show some courage, post a comment as to why.
    – Derple
    Jun 6, 2017 at 18:28
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    Not sure, I've used similar extenders for USB connections (webcams in a zoo), and longer runs may or may not work, depending on the actual hardware attached. Also there is often the option of powering the extender at both ends via wall-wart, doing this seemed to increase the reliability of the connection. Voting question up 'cause I'm curious now too
    – ivanivan
    Jun 6, 2017 at 18:30
  • @ivanivan yeh. The spec of adaptor is limited to 20m and states the quality can differ based on the output source. As to be expected. But i just cannot fathom how they make axtra connections with no extra wires. Too much crosstalk to be reusing wires for multiple data .
    – Derple
    Jun 6, 2017 at 18:32
  • You didn't provide your research on how you concluded DVI-D requires 18 wires. In order to determine how it worked, you would need the physical device, to determine which DVI-D pins are connected to which CAT5 wires.
    – Ramhound
    Jun 6, 2017 at 18:36
  • They don't make extra connections. They only transfer the data, the adapter itself handles the reset of the pins. A small majority of the DVI-D pins are just shield pins. Only 3 of the pins are for the analog video signal anyways
    – Ramhound
    Jun 6, 2017 at 18:41

1 Answer 1

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It's not purely electrical. You can't just connect some DVI wires to some UTP wires and expect it to work.

These adapters tunnel DVI-D signals over some other protocol that can be sent over 4 twisted pairs. In other words, the signal is re-encoded into a suitable format, then transmitted and finally decoded back into DVI-D.

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  • Ah, i understand similar to other devices that do this task. But they have managed to build into a tiny adaptor, and use the 5v on the DVI to power the encode i guess? I am going to ahve to buy a set and pull it apart. Thanks
    – Derple
    Jun 6, 2017 at 18:34

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