CAT6 CAT5e question
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From: Moe Trin on 8 Apr 2010 16:05 On Thu, 8 Apr 2010, in the Usenet newsgroup comp.os.linux.networking, in article <Pine.LNX.4.44.1004081032020.1513-100000(a)menace.crumblenet.co.uk>, Tim Fardell wrote: >Greg Russell wrote: >> The only difference between cat6, cat 5e, cat5 and any other cable >> that uses RJ45 is the twist pattern in the wires comprising the >> cable and possibly the sequence of wires in the RJ45 left-to-right. >> The same crimp tool works for all of them. >Agreed the same crimp tool can be used, but the twist pattern and >wire ordering in the plug can't be the only differences, because >it's possible to buy special "Cat6" RJ45 plugs and wall sockets, >which are more expensive than their Cat5e counterparts. Are they 'oxygen free copper' hand twisted by virgins just like the over-priced speaker cables sold to audio-phooles? If suckers will buy stuff, there is always someone out there to take advantage of it. >Isn't the overall outer diameter of a Cat6 cable greater than that >of Cat5e, hence the need for different connectors? The EIA specification sets out performance requirements only, so it depends on the vendor. Some (Belden being one example) make the Cat6 cable from 23 AWG wire (0.02257 inch diameter) and Cat5/5e cable from 24 AWG (0.02010 inch diameter). The O.D. is only specified as "1/4 inch maximum" in the EIA spec and the diameter of the cables are more influenced by the jacket _material_ (0.235 for non-Plenum Cat6 down to 0.204 for Plenum Cat5e) than the wire diameter. That's why some connectors are specific to some manufacturers cable. Check with a reputable parts manufacturer. Old guy
From: Tim Fardell on 8 Apr 2010 18:13 On Thu, 8 Apr 2010, Moe Trin wrote: > On Thu, 8 Apr 2010, in the Usenet newsgroup comp.os.linux.networking, in article > <Pine.LNX.4.44.1004081032020.1513-100000(a)menace.crumblenet.co.uk>, Tim Fardell > wrote: > > >Greg Russell wrote: > > >Isn't the overall outer diameter of a Cat6 cable greater than that > >of Cat5e, hence the need for different connectors? > > The EIA specification sets out performance requirements only, so it > depends on the vendor. Some (Belden being one example) make the Cat6 > cable from 23 AWG wire (0.02257 inch diameter) and Cat5/5e cable > from 24 AWG (0.02010 inch diameter). The O.D. is only specified as > "1/4 inch maximum" in the EIA spec and the diameter of the cables are > more influenced by the jacket _material_ (0.235 for non-Plenum Cat6 > down to 0.204 for Plenum Cat5e) than the wire diameter. That's why > some connectors are specific to some manufacturers cable. Check with > a reputable parts manufacturer. Well, I just looked at a piece of Cat6 cable, and it has a cross-shaped plastic spacer up the middle of the cable which keeps the four twisted pairs slightly separated from each other. This results in the outer diameter of the cable being slightly greater, so it's nearly impossible to stuff into a standard RJ45 plug. You probably could get it in, but it's clearly not designed to take a cable of that outer diameter. I can only assume, therefore, that the special Cat6 RJ45 plugs have a bigger hole in the end ;-) That doesn't explain the special Cat6 RJ45 wall ports you can get - maybe they are Hi-Fi Audiophile-grade connectors ;-)
From: unruh on 8 Apr 2010 20:48 On 2010-04-08, Tim Fardell <tim.fardell.all-your-clothes(a)virgin.net> wrote: > On Thu, 8 Apr 2010, Moe Trin wrote: > >> On Thu, 8 Apr 2010, in the Usenet newsgroup comp.os.linux.networking, in article >> <Pine.LNX.4.44.1004081032020.1513-100000(a)menace.crumblenet.co.uk>, Tim Fardell >> wrote: >> >> >Greg Russell wrote: >> >> >Isn't the overall outer diameter of a Cat6 cable greater than that >> >of Cat5e, hence the need for different connectors? >> >> The EIA specification sets out performance requirements only, so it >> depends on the vendor. Some (Belden being one example) make the Cat6 >> cable from 23 AWG wire (0.02257 inch diameter) and Cat5/5e cable >> from 24 AWG (0.02010 inch diameter). The O.D. is only specified as >> "1/4 inch maximum" in the EIA spec and the diameter of the cables are >> more influenced by the jacket _material_ (0.235 for non-Plenum Cat6 >> down to 0.204 for Plenum Cat5e) than the wire diameter. That's why >> some connectors are specific to some manufacturers cable. Check with >> a reputable parts manufacturer. > > Well, I just looked at a piece of Cat6 cable, and it has a cross-shaped > plastic spacer up the middle of the cable which keeps the four twisted > pairs slightly separated from each other. This results in the outer > diameter of the cable being slightly greater, so it's nearly impossible to > stuff into a standard RJ45 plug. You probably could get it in, but it's > clearly not designed to take a cable of that outer diameter. ? Most homemade plugs at least you strip the wire back far enough that you are crimping against the wires, not the outer jacket. > > I can only assume, therefore, that the special Cat6 RJ45 plugs have a > bigger hole in the end ;-) > > That doesn't explain the special Cat6 RJ45 wall ports you can get - maybe > they are Hi-Fi Audiophile-grade connectors ;-) Those are pretty lousy-- 20KHz, vs 250MHz. I suspect they are designed so as to give less reflection from the alteration in the properties at the plug. > >
From: Tomi Holger Engdahl on 9 Apr 2010 07:13 Owner <Owner(a)Owner-PC.com> writes: > On Wed, 07 Apr 2010 13:17:43 -0400, Owner wrote: > > > Can Cat5e RJ45 connector crimper be used for Cat 6 connector > > > > because I heard cat 6 connector is different from cat 5e connector > > Also Same question for cable tester. > > can cat5e cable tester be used for cat 6 cable? CAT5e cable tester can be used to test CAT6 cable with some limitations: If the tester says "FAIL" you know something is wrong. If the tester says "PASS" you know the cabling is working at as well as a CAT5e cabling would, but you don't know if it meets all the CAT6 criterias... -- Tomi Engdahl (http://www.iki.fi/then/) Take a look at my electronics web links and documents at http://www.epanorama.net/
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