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Dual-Link DVI cable limits

B

bbenz33

[H]ard|Gawd
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I am looking to put my systems into a rack and then simply run a few cables to my desk (25-30ft for resolution of 2560x1440). I have checked the DVI specs and done a few google searches but have not come up with a definitive answer if this is possible. I have seen lots of cables that far exceed the "specs" that is listed for DVI in terms of length but nothing that states what these cables are capable of.
 
10m(33ft) seems limit without booster, now there is a chance that some of the really long cables have some sort of boosting built into them, but that would also be a more expensive cable by all means. DVI-I Dual link cable is what you are looking for to be able to support the resolution you are asking.

grabbed info from reading through Skripkas link.
 
Yeah I had already viewed the wikipedia link that proved less than useful. Basically from what I could find on the specs for DVI they only garauntee the signal for like 2-3m but was hoping someone here had experimented with longer runs. I have been looking at the Monoprice cables of either 25 or 35 feet and hoping that they might work for my needs.
 
bbenz33 said:
Yeah I had already viewed the wikipedia link that proved less than useful. Basically from what I could find on the specs for DVI they only garauntee the signal for like 2-3m but was hoping someone here had experimented with longer runs. I have been looking at the Monoprice cables of either 25 or 35 feet and hoping that they might work for my needs.
Click to expand...

Monoprice wouldn't sell those cables rated for that distance if it could not achieve them.
 
BatJoe said:
Monoprice wouldn't sell those cables rated for that distance if it could not achieve them.
Click to expand...

Unfortunately what I've read doesn't necessarily state that the long cables are not going to work but work at lower resolutions...

I have yet to read anything that states they will work at the longer distances at the higher resolutions.
 
bbenz33 said:
Unfortunately what I've read doesn't necessarily state that the long cables are not going to work but work at lower resolutions...

I have yet to read anything that states they will work at the longer distances at the higher resolutions.
Click to expand...

Ask someone at Monoprice. And if it doesn't work, send it back to them for a refund. They are quite easy to deal with.
 
they would not be the first ones to sell a cable that does not meet with what it does, I think most folks are using these cables for 1920x1080 or lower to begin with, if you look at their description of said cable
"These precision-engineered cables are fully compliant with the DVI standard defined by DDWG (Digital Display Working Group). The DVI-D dual link configuration provides enough bandwidth for resolutions up to 2048 x 1536 and allows high speed digital transmission up to 9.9 Gbps"

So according to this, it would not allow the reso OP is looking to support, could be based on length etc.
 
http://www.datapro.net/techinfo/dvi_info.html
"The official DVI specification mandates that all DVI equipment must maintain a signal at 5 meters (16 feet) in length. But many manufacturers are putting out much stronger cards and bigger monitors, so the maximum length possible is never exact
In-house tests on varying equipment have produced strong signals up to 9 and 10 meters long. Tests at 12 meters generally resulted in signal noise and an unusuable image on the display, and anything longer rendered no image at all. "

http://www.lindy.co.uk/tips/DVIGuide.html
'With standard DVI cables you can extend the distance for digital monitors, with fixed cables and connections, by up to 7.5m. For distances greater than 7.5m, special low attenuation cables are recommended to provide satisfactory results.
 
dragonstongue said:
"These precision-engineered cables are fully compliant with the DVI standard defined by DDWG (Digital Display Working Group). The DVI-D dual link configuration provides enough bandwidth for resolutions up to 2048 x 1536 and allows high speed digital transmission up to 9.9 Gbps"

So according to this, it would not allow the reso OP is looking to support, could be based on length etc.
Click to expand...

This is a typo.
 
Well I sent them an email about it and will wait for their response. Unfortunately this is one area I didn't think about when buying my monitor and expecting my PC to end up in my rack at the same time. Hopefully it isn't too dificult to make this happen.

The other option that I looked into was using a long DisplayPort cable and then connecting a short DVI cable to that, but that spec also has fairly short distances for the cable runs as well.
 
bbenz33 said:
Well I sent them an email about it and will wait for their response. Unfortunately this is one area I didn't think about when buying my monitor and expecting my PC to end up in my rack at the same time. Hopefully it isn't too dificult to make this happen.

The other option that I looked into was using a long DisplayPort cable and then connecting a short DVI cable to that, but that spec also has fairly short distances for the cable runs as well.
Click to expand...

You could liveChat with them right now for immediate response:
https://www.monoprice.com/home/chat.asp
 
http://www.avsforum.com/t/783852/max-length-for-hdmi
"I wouldn't want to guess at anything further than about 30-35'. The longer the cable, the more likely you are to have issues with the signal.
I use DVI and HDMI to about 25' with no discernible problems. Buy a cable (make sure you can return it) and try it out if distance is a question."

"I use a 50ft run of a single HDMI cable with no signal loss..
you could always go HDMI as they do tend to be able to go a much longer distance and adapters are quite easy to come by.
 
Well depending on their response (was at work so I couldn't live chat) I will see what I can do with one of their cables. I can't use HDMI as my monitor won't support that.
 
dragonstongue said:
http://www.avsforum.com/t/783852/max-length-for-hdmi
"I wouldn't want to guess at anything further than about 30-35'. The longer the cable, the more likely you are to have issues with the signal.
I use DVI and HDMI to about 25' with no discernible problems. Buy a cable (make sure you can return it) and try it out if distance is a question."

"I use a 50ft run of a single HDMI cable with no signal loss..
you could always go HDMI as they do tend to be able to go a much longer distance and adapters are quite easy to come by.
Click to expand...

Depends on the revision of HDMI...until rev 1.3 IIRC or maybe 1.4, you couldn't go more than 3 meters on an HDMI cable without severe snow flaking.
 
Basically I got a response that says it may or it may not work, but we have a 30 day money back no restock fee if you would like to test...
 
odd, my PS3 uses a 12ft HDMI super speed or whatever they call it from walmart :p my brother has one that is a good 30 feet if not longer no issues, ahh well, I believe they are spec 1.3a, and that is good they will do that for you, not many places will let you try before you buy sort of speak, nice place and nice of them
 
I have done the exact same thing. I have all my computers in a 42U rack in the corner. I have a smattering of 2, 3, and 5MP and monitors along with some 1080p. Believe it or not my GTX to 1080p NEC gave me the most trouble. The other monitors are running at upto 35 ft with no problem. I think you just have to try it and you may or may not need a single booster. Just run the cables somewhat seperated from your power and low voltage lines if you have any.
 
25 to 30 feet is usually workable with high quality cables and no extender. It depends on your card and monitor. We have over a dozen 30 LCDs extended between 20 and 100 feet. I have a first generation Dell 30" that runs reliably on a 75 foot Gefen heavy blue cable (no longer available) with no extender! I usually use Gefen extenders over 25 feet but I have one current model HP 30 inch that won't work even with an extender but will work extended on the Display Port.

We use StarTech 25 foot cables and Gefen for longer runs.
 
Thanks for the added info. zkv1 do you know the AWG on the heavy blue cable? So far I see both 24 and 28 and will be getting a 24 AWG cable unless there is something else that is better. From the sounds of it I shouldn't have an issue unless my video card and monitor just want to cause problems.
 
Sorry but the Gefen cables are 5 years old and discontinued so I don't have the specs. I just looked at their site again and they are saying "booster required over 15 feet". I'm sure that was not there when I first bought the 60 foot and longer cables.

The 25 foot Startech are current models and usually work with 2560x1600 panels without a booster (3 out of 4) but as I previously posted, some specific units just don't work without an extender.

Good luck.
 
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