[RndTbl] How Long Can HDMI Cable be Run? -- Blue Jeans Cable

John Lange john at johnlange.ca
Wed Sep 9 13:04:02 CDT 2015

Ya, I guess I underestimated the bit rate which explains why they couldn't
use ethernet and also why the HDMI distances are so short. It also explains
why HDMI extenders are so unreliable.


On Wed, Sep 9, 2015 at 12:35 PM, Gilles Detillieux <
grdetil at scrc.umanitoba.ca> wrote:

> I share your frustration, but in this case even gigabit Ethernet doesn't
> have the bit rate to support HD resolutions.  HDMI 1.0 is almost 5 Gb/s,
> 1.3 is about 10 Gb/s, and 2.0 is about 18. (
> https://en.wikipedia.org/wiki/HDMI)  I suppose they could initially have
> gone with 10 Gb/s Ethernet, but that would have limited future growth.  Not
> to mention that there'd be tons of support issues with people trying to use
> cables not rated for anything over 1 Gb/s or even 100 Mb/s.  ;-)
> More frustrating is the patent encumbrances and associated license fees,
> and inevitable competing standards to try to avoid these.  Or am I mistaken
> that this was one of the motivations behind DisplayPort?
> The price gouging on cables in the early days of the standard, before
> there was much competition, was another big frustration, but fortunately
> reasonably short lived.
> On 09/09/2015 08:07 AM, John Lange wrote:
>> It really makes you wonder why manufacturers always seem to want to
>> reinvent the wheel. Why wouldn't they just use 1G Ethernet? It's an
>> established solid technology with readily available connectors and cables.
>> Easy to work with, good over significant distances... You could even plug
>> it into a switch if you need to go further and you could probably leverage
>> Ethernet multi-cast to feed multiple displays over large distances such as
>> in sports bar.
>> John
> --
> Gilles R. Detillieux              E-mail: <grdetil at scrc.umanitoba.ca>
> Spinal Cord Research Centre       WWW:    http://www.scrc.umanitoba.ca/
> Dept. of Physiology and Pathophysiology, Faculty of Health Sciences,
> Univ. of Manitoba  Winnipeg, MB  R3E 0J9  (Canada)
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John Lange
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