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Thread: One-way vide adapters? What is this?

  1. #1
    Elite Master Razor's Avatar
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    One-way vide adapters? What is this?

    I have been looking at my local cable store and I came across something that confuses me.
    For instance, take this adapter: https://conectica.ro/adaptoare-conve...m-lindy-l38189
    It says:
    Acest adaptor/convertor face trecerea de la DVI-D (semnal digital) la VGA (semnal analogic).
    Functioneaza numai in acest sens, nu si invers! Pentru sens opus: https://conectica.ro/adaptoare-conve...b-lindy-l38184

    Which translates to:
    This adapter works from DVI-D (digital) to VGA (analog).
    It works only in that way, and not the other way around! For VGA to DVI use: https://conectica.ro/adaptoare-conve...b-lindy-l38184

    I don't get it, why would it only work one way? And what is one way? I mean in a DVI to VGA adapter, what is the DVI device, the monitor or GPU?
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    Elite Sazzy's Avatar
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    I'm guessing the cables translates the signal from digital to analog, but is unable to process an analog signal and turn it into a digital one
    (and thus dvi-d on graphics card, vga monitor)
    Last edited by Sazzy; 29.03.18 at 19:49.
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    anon (01.04.18)

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    Moderator anon's Avatar
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    Quote Originally Posted by Sazzy View Post
    I'm guessing ...
    You guess correctly Most active adapters like this one are one-way. Passive ones should work both ways, if you have the necessary extension cables (but they can't convert a digital signal into an analog one or the other way around).
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    Elite Master Razor's Avatar
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    But the source is always the GPU, correct? In DVI to VGA - DVI is always the GPU?
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    Elite Sazzy's Avatar
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    Basically, yeah. (I'm guessing DVI-D, AFAIK DVI-I can send out both analog and digital, so a passive cable would suffice here)

    Though there are cables that also go the other way around, most of them are passive VGA to DVI(-I) ones
    Last edited by Sazzy; 06.04.18 at 23:24.
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    Moderator anon's Avatar
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    Quote Originally Posted by Master Razor View Post
    But the source is always the GPU, correct?
    Well, video signals usually originate from there
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