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

John Lange john at johnlange.ca
Wed Sep 9 08:07:04 CDT 2015

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.


On Wed, Sep 9, 2015 at 1:13 AM, Trevor Cordes <trevor at tecnopolis.ca> wrote:

> Some more research:
> "1.4 spec, in order for an HDMI cable to be considered high-speed, it
> must be able to pass 3,840x2,160 pixels at up to 30 frames per second
> (and 4,096x2,160 at 24 frames per second)."
> Using my math-fu that means that the bandwidth that 3840x2160 at 30 the
> above says 1.4 can do is MORE than the bw the Dell 2560x1440 at 60
> requires, meaning that a HDMI 1.4 cable should drive the Dell.  I'll
> make sure I obtain a (non-liar) 1.4 cable to test next.  Maybe a 6 and
> a 12, to ensure length isn't a factor.
> It's surprising that there's a dearth of info on this stuff on the
> net.  For instance, most video card spec pages (for >1 year old cards
> at least) don't list the HDMI version supported.  I don't think there's
> a (linux) software way to tell either.
> There are ton of people trying to attach 2k and 4k monitors to their
> existing cards with DVI/HDMI and running into problems.
> This seems to be bleeding edge, no info out there, you're on your own
> territory.  I'm a bit annoyed since I'm not even trying to do 4k, just
> lousy 2k that even 10 year old DVI supports!  Grrr.
> P.S. The reason I didn't just use DVI is that the new monitor has no
> DVI!  P.P.S. DVI can support 2560x1440 as long as it's dual-link.
> The other real gotcha for me is that my workstation is older and many
> newer PCI-express cards I try don't run in it (no POST).  I've seen
> this with many older boards, not just mine.  It's all supposed to be
> backwards compatible, but in reality it is not.  So if I buy a new card
> with d.port I'd say there's a 75% chance it won't work for me.  I would
> buy a new board too, but my ws is ECC and that means $1k+, not $400 for
> a guts upgrade.  Higher rez isn't worth $1k + monitor price to me: not
> yet anyway.  :-)
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John Lange
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