HD-SDI over CAT6a / CAT7

Has anybody tried to transmit the HD-SDI signal via 1 of 4 pairs UTP cable? Since CAT 7 support frequency up to 1GHz(Cat6a 500MHz) while HD-SDI(not 3G-SDI) only needs 7xxMHz. I think it's possible to use other 3 paris as inter-com or power supply. But any tried? I'm worrying it won't function for long distance.

This is a terrible idea - twisted pair cabling is very prone to interference, this is why HDMI doesn't work well.

Use proper HDSDI spec BNC for your video signals.

If you are really need to send multiple signals over one cable, look into something like this
http://www.bhphotovideo.com/c/product/133589-REG/Comprehensive_3BP_3BP_50HR_3_BNC_Male_to_3_BNC.html

It's basically just giving you 3 poor quality coaxial cables in one, which is still better than twisted pairs. Still would not recommend doing that, I've stopped using this method entirely. It was good for at least 50', but the cables die faster than I'd like. But I would use them to send cameras, as well as feed trisync and program monitor back to them. You can get them with 5 BNCs on each end as well.

Actually we use a lot of HDBASE-T (http://en.wikipedia.org/wiki/HDBaseT) to distribute HDMI and it works really well with CAT6 up to like 100 meters. Uncompressed HDMI over 100 meter CAT6 cable.

For some runs we use SDI->HDMI HDMI->HDBASE-T 100 meter CAT6 HDBASE-T -> HDMI HDMI-> SDI when we end up using the internal infrastructure of some venues.

It's just a matter of someone building a HDBASE-T sender with a SDI converter and vice versa.

http://www.deltaco.se/?itemid=(HDMI-210D)
This is how they look like, this version has the one side injecting PoE so the reciever doesn't need any power. Super slick.

This is a terrible idea - twisted pair cabling is very prone to interference

That does not make sense to me, unless you mean UTP cabling (unshielded twisted pair).
Higher quality cabling like S/FTP with double shielding should be very immune to interference, otherwise it would not be possible to use that for 10 GBit network cabling.

Please read the question :

Has anybody tried to transmit the HD-SDI signal via 1 of 4 pairs UTP cable?

he is specifically asking about UTP not SFTP. Even with the very best twisted pair cable you cannot just connect one wire to the signal and one wire to the shield of a coax and expect it to work.

HDbaseT is another thing altogether.

Sent from my iPad using Tapatalk HD

Oh I am sorry CAT7 is S/FTP. And I can find things like below. But I need to make sure I wont lost signal via CAT7.

HDbaseT is another thing altogether.

Totally agree but it proves a point of the capability of the cable with the right encoding. If you can transmit uncompressed HDMI 1080p60 RGB then you must be able to do SDI.

As I understand it the HDbaseT process encodes the hdmi along with audio, network, serial and IR commands into a different format for transmission down the cable. It's more complex than a normal balun. And the HDbaseT format stops working at around 100m where hdsdi can go further down high spec cable.

Nobody makes an HDbaseT encoder/decoder for SDI anyway so the theoretical possibility of doing so is a moot point.

Cheers
Tom

Sent from my iPad using Tapatalk HD

Nobody makes an HDbaseT encoder/decoder for SDI anyway so the theoretical possibility of doing so is a moot point.

True, that's however something i hope will change since SDI->HDMI works so well over HDBASE-T. It's a very efficient solution when dealing with existing infrastructures in buildings. Just hook on to the internal network patch and hijack the lines for video.

If the building wiring is point to point, new and not running next to power lines then this might work. Many buildings have old network infrastructure, run via IP routers / fibre backbones and a billion other things which will prevent HDbaseT from working.

HDbaseT spec suggests SFTP cat6 / cat7 cable run direct from TX to RX depending on anything else would seem foolish to me.


Sent from my iPad using Tapatalk HD

I agree all of you. But the fact is no HDBaseT device meet my requirement(daydream honestly haha). No only HDMI to HD-SDI, but power supply for video provider(camera) is a problem. The original purpose of HDBaseT is to provide power for video receiver. My idea maybe need a special product.
Oh, I would like to say, is there anybody interested in same topic and have experience about electronic product development? I think it's a good idea to make one if we can't purchase from market.

I've used AvenView HDMI over ethernet extenders and they work great. We had probably at least 300 feet of cat5/6 connecting it without issue. Only minor problem I noticed is a bit of delay since I believe there is some type of compression going on. Colors might be a bit tweaked, but nothing that really bothered me. Connected the receiver end via HDMI to our 1 M/E and it connected right up.