Originally Posted by slateX
I am trying to run HDMI from my computer to my excellent new TV. 4k 60fps HDR.
My current length requirement is about 35 ft. I would want to future-proof (with regards to length; I'm not going to HDMI 2.1 or 8k any time soon) if the price were feasible and if it didn't degrade my results.
I'm going to try to play games with the setup, so latency would be an issue. I've looked at active cables, hdmi-cat converters, and powered hdmi extenders, and right now it looks like active cables would work best for me.
HDMI Extender: https://www.amazon.com/AV-Access-Ext...SIN=B073QL6YT3
HDMI>CAT Adapter: https://www.amazon.com/AV-Access-Ext...SIN=B073QL6YT3
I've seen Ruipro recommended on these forums, but I also see Redmere / Spectra 7 / Cabernet cables for much lower prices at Monoprice. https://www.monoprice.com/product?p_id=12735
I just noticed that these cables don't do HDCP 2.2 so I'll have to see if that will impact PC output for gaming, but
Sorry this info came from a user in the Q&A section. The product page clearly states it is HDCP 2.2 compliant.
otherwise what else might be worse about them? Worse bending angles? Anything else?
I've noted that some active cables don't recommend connecting the output to anything but the display. Check out the "This Optical HDMI Cable is not compatible with A/V receivers." line for this cable: https://www.amazon.com/ATZEBE-Fiber-...EV7ZDHMY2SY2VF
I'd seen that caveat on a couple of active optical cables, so I started believing that they all had that limitation. It looks like the Ruipro cables don't have that limitation, however. I'm still a little curious about why some of these cables wouldn't work with receivers.
All of this has been discussed before in this forum, but if you want to rehash it again in one thread, that's fine.
Initially, active cables were designed to extend the cable length, without losing signal integrity, by drawing a little power from the sink end (5mA from the 5V HDMI input). This works very well for 1080i/p, and could be easily accomplished using existing, copper-only cables. Redmere was one of the first companies to successfully patent the chipsets to accomplish that. As video standards became more demanding (4k and then 4k HDR) the chipset technology started to fall behind and issues arose. Redmere was eventually bought out by Spectra and they improved considerably on the technology and designed the new generation of chipsets, Spectra 7 HT8181, which were more robust and work very well for 1080i/p and, to a certain extent, 4k HDR.
Copper cable does have its technical limitations, which can be overcome somewhat by a thicker wire gauge. However, that introduces its own set of issues. Loss of flexibility which can greatly diminish bend radius and increased strain on the HDMI input.
HDBT is another technology which has worked well in the past. Connecting a solid core CAT-6 cable (non-CCA and not the CAT-6 ethernet patch cable) to an active tx/rx interface allows one to extend the cable run over longer distances as well without losing signal integrity. The beauty of HDBT is that one can remove the HDBT interface and replace it if it fails overtime, or replace it with newer chipset technology without removing the cable. However, it too requires power so an external power source is needed. Usually in the form of a USB-like dongle which plugs into a wall outlet. Valens is the company who provides the proprietary chipsets for HDBT and they are working on new chipsets that will be able to handle 4k HDR much better than what is currently being offered. I'm not sure if they are offering HDBT with the new Valens chipsets yet or not. There will still be some video compression with HDBT so that may be an issues to some. CAT-6 defines 8 wires for data transport, so HDBT needs to process/convert the data before transporting via the 8 copper wires to HDMI, which requires 19+1 copper wires.
Hybrid fiber cables are 4 glass fiber cores surrounded by 8 solid copper wires. Hence the term "hybrid". The 4 optical wires are for high speed data transfer instead of the traditional HDMI copper 1-12 wires. The 8 copper wires are used for the low speed data transfer instead of the traditional HDMI copper 13-19 +1 wires. Basically the fiber carries all of the high speed video data whereas the copper carries options like ARC, HDCP, and EDID. The end result is zero data loss and compression (as defined by HDMI 2.0 and 2.1 specifications) as long as the source/sink end HDMI chipsets are able to handle the signaling.
ARC/eARC is still being problematic for runs over about 30m for any type of cabling. So if that is something you need, and you have a run over 50', there may be problems with any type of cable. The hybrid fiber folks are working on it. 15m doesn't seem to be an issue.
There can be issues at the HDMI sink end with the power requirements. 5mA off of a 5V input is not much but as the bandwidth increases (48Gbps) any fluctuation can affect signal integrity, so something like a voltage inserter may be needed which ensures a constant and reliable power source. And this works with any type of active cabling.
The ideal situation for any cable connection, be it active or passive, is to have a single cable run from source to sink, without any adapters, extenders, wall plates, etc in-between. As mentioned before, any "interruption" in the signal path can result in sparkles, audio/video dropouts, etc. That is not to say that adapters and extenders don't work, they do, but when problems occur, that's the first thing to look at. The cable is just a data pipe. It can not improve the signal quality beyond what the source is sending and the sink is receiving, regardless of marketing claims, so you want to keep that connection as simple as possible.
Bend radius is another often over-looked issue. If the cable installation results in sharp bends, that can eventually affect the signal path because the bending may damage the wiring inside and that will cause issues over time. Thick cables work well but as mentioned, the trade off is loss of flexibility which becomes important if you have a long run and are installing in-wall. You also run the risk of damaging the HDMI input because of the extra "weight" of the cable on the connector end. Active cables are usually much thinner because they are powered so a thicker wire gauge is not needed. The hybrid fiber cables can even have a much better bend radius due to their design.
It is interesting that the ATZEBE specifically mentions that it is not compatible with A/V receivers. I'll have to look into that but my guess is that there is some some sort of design/power issue. If that's the case, I wouldn't use them.
The ONLY way to future proof any type cabling is to use conduit if you have a long run installed in-wall or don't have easy access to your cabling. Period.
This should be moved to the HDMI forum as it is specific to HDMI.