Min lenght for patch cable
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Posted by Sparanghel on September 29, 2005, 2:08 pm
Please log in for more thread options Is there a minimum length for a patch cable? I think I found somewhere a text saying that the limit is 3 ft, but for the life in me I can't find the reference Thanks SP | ||||||||||||||||||||||||||||
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Posted by Dale Farmer on September 30, 2005, 1:01 am
Please log in for more thread options Sparanghel wrote: I've seen them as short as a couple of inches. worked fine. --Dale | ||||||||||||||||||||||||||||
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Posted by Robert Redelmeier on September 30, 2005, 2:04 am
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> I've seen them as short as a couple of inches. worked fine.
I've made them 6 cm wirelength to cross over two interfaces in the same machine. Ran fine. This is far more demanding than the typical patch panel that has 100's of feet of total wirerun. My shortest is a single loopback plug. 2 cm wire. Also works fine. -- Robert | ||||||||||||||||||||||||||||
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Posted by Sparanghel on September 30, 2005, 12:27 pm
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> > I've seen them as short as a couple of inches. worked fine.
>
> I've made them 6 cm wirelength to cross over two interfaces in > the same machine. Ran fine. This is far more demanding than the > typical patch panel that has 100's of feet of total wirerun. > > My shortest is a single loopback plug. 2 cm wire. Also works fine. > > -- Robert Finally I found the reference. Is not very conclusive: http://www.ertyu.org/~steven_nikkel/ethernetcables.html Remember, an end to end connection should extend at least 1m (3ft) and not more than 100m (~328ft). Yes, there is a minimum, its little known, little referred to and not usually important, but I have seen cases where short cables caused problems. The longer the cable becomes the more it may affect performance, usually it is a gradual decrease in speed and increase in latency. When uplinking between (cascading) hubs/switches, you usually need a very short cable, less than 1m, check the device's specifications. SP | ||||||||||||||||||||||||||||
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Posted by Robert Redelmeier on September 30, 2005, 8:34 pm
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> Finally I found the reference. Is not very conclusive:
> > http://www.ertyu.org/~steven_nikkel/ethernetcables.html > > > Remember, an end to end connection should extend at least > 1m (3ft) and not more than 100m (~328ft). Yes, there is > a minimum, its little known, little referred to and not > usually important, but I have seen cases where short cables > caused problems. The longer the cable becomes the more it > may affect performance, usually it is a gradual decrease > in speed and increase in latency. When uplinking between > (cascading) hubs/switches, you usually need a very short > cable, less than 1m, check the device's specifications. SP I'm deeply suspicious of a reference with homebrew information. "gradual decrease in speed"? never seen. I've run overlength cables at full wirespeed. "increase in latency"? Only theoretically. A full 100m roundtrip takes 0.0010 milliseconds. Cascading 100baseTX hubs (if you can ever find one) is subject to very tight rules to respect the collision diameter. 10baseT has the old 5-3-1 rules. Switches aren't subject to these cascading rules. Perhaps the author has seen problems with short cables. With homemade crimp-on-solid I'd expect problems. -- Robert | ||||||||||||||||||||||||||||
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> text saying that the limit is 3 ft, but for the life in me I can't find the
> reference
>
> Thanks
> SP