When is High Speed HDMI Required?

If I’m reading that right, it’s a change in the bandwidth of “high speed” cables.

According to that well known paragon of accuracy, Wikipedia, Category 2 high speed cables are rated at 340MHz for 1080p60 and 2160p30, not for 1080p120 as supposedly is needed for full resolution 3D.

Am I misunderstanding something?

Possibly if you used a black box you could negate both bypasses.  I probably wouldn’t want to use a conductor though.  Version 5.1 might be suitable through cognition but to maintain proper flow I’d suggest copulating a 3.1 out through a thigger majigger.

OMG, what a fustercluck. Why would they introduce a new spec with a minimum bandwidth that is LOWER than the 4.95Gbps limit of HDMI 1.0? That’s what the minimum bandwidth for a low-speed cable should be - 165MHz, not 75MHz.

And by the way, who in the heck is gonna watch 1080i at 120Hz or with deep color? Any source or display device that only supports 1080i won’t support either of those things.

-Jason Brown
http://www.asktheadvisors.com

I think it’s time that the industry move away from proprietary solutions like HDMI.  I don’t believe HDMI officially supports lengths beyond approximately 15 feet.  If that’s the case, what good is it?  Anything beyond that is going to involve voodoo, pixie dust and finger pointing.  Anyone that’s installed a TV above a fireplace and needs to connect to a switcher/receiver/repeater, knows that that 15 feet is going to be used up way before you get to the equipment location.  Why can’t the manufacturers settle on CAT-6 as the transport medium, like the computer industry is doing, or some other kind of inexpensive twisted cable solution that can deliever audio and video over IP.  Cisco, when are you going to buy Crestron?

1) I am slightly confused regarding your chart. But I believe that comes from HDMI.org. It is regarding the ARC spec which HDMI claims will be able to use an High Speed or Standard Speed HDMI cable without Ethernet. Your chart (column 6) refers to it as well. But according to the 2009_11_18 RevisedTradeLogo_Guidelines_FINAL document released by HDMI they feature an input/output labeled HEC & ARC which utilizes the High Speed or Standard Speed with Ethernet: See page 12. Does the spec need to allow two way audio communication which is the idea for the re wiring of the HDMI cable to accomodate Ethernet as well. The hardware manufacturer has to modify the input/output slighly to be able to allow Etnernet or Audio Return Channel. Shouldn’t the cable (with Ethernet) be the same as well?

2) I understand the HDMI cable with Ethernet is supposedly backwards compatible with all HDMI versions. can you verify this?

3) You neglected to list a column for the 3D format in your chart. Was that by design or did you just leave it out becuase it has not been truly defined?

Tim
The way I understand it is that the ARC feature works on all four types of HDMI cables in every viewing format except for 1080p. If you want to watch in 1080p, you need a High-Speed HDMI cable or a High-Speed HDMI with Ethernet cable.
To your second point, the HDMI cable with Ethernet is backward compatible with all previous versions of HDMI.
The chart did come from HDMI Licensing LLC and 3D was not included. I believe they were still finalizing that spec when the chart was prepared.