Cat5e cabling

April 8, 2009 at 18:03:56
Specs: Windows XP
OK, just a quick question. I have a cat5e cable with the typical wiring of T-568B

1- White/orange
2- Orange/White

My question is that everyone is talking about twisted pairs and each of the wires is twisted together except the blue and green ones. What i mean is that the blue/white and the white/blue are twisted together and the green/white and white/green are twisted together but they are wired in a different sequence on both ends, you would think it should be wired

If the pairs were to be twisted and represented normally, is this a valid subject or am i just being wierd?

I ask these questions as I have just wired up a 30m length through my house and am getting the "limited connectivity" message and I have tired everything i can think of.

Any comments would be welcome.

See More: Cat5e cabling

Report •

April 8, 2009 at 19:04:56
There is nothing weird about it. When the Verizon techs installed my fiber optic connection, one of them had trouble "cutting the head" as they call it. It's easy to make a mistake & they do it everyday.

Report •

April 8, 2009 at 19:30:33
Hmm so even experts can get it wrong hey, do you think the blue+white/green should be a pair and the Green/white blue should be paired for my config to work, did they cable it up wrong, man i am so lost now.

Basically I bought a 30m cable and cut 1 end off it. The end I cut off goes through the roof and into an rj45 point, the other end plugs straight into the pc.
The point is joined to the modem/router by another short cable.

This is the way mine is wired up, initially I wired the White/blue and the White green in the wrong spots and got nothing, but when i fixed
that error I got lights at my modem and network card but a no connectivity issue :(

I went through the whole process of

and still nothing

I am going to check the cabling tonight to see if there are any twists, a point of note is that it passes through a metal section of pipe and is
in close proximity to my speaker wires for my amp (lying on top of them)

Does it matter that the cable going into the point from the modem/router is a cat5 and not 5e?

What I am going to do tonight is buy two cat5 ends and put both these on and try to connect straight from pc to modem/router without any points in the way, then I am going to buy another 30m cable tonight and connect it straight to my pc from the modem to see if the lenght is an issue, if that works then i'll feed that cable through the roof in the same way and see if it breaks down, it's just got me licked really. Also is there any way to include pictures on these posts?

Report •

April 8, 2009 at 20:37:13
That's right. Even the experts have trouble. I've never attempted it. A retired electrician I know told me I should start doing that work but I never bought the tools. Check out the sites below. They might help you get it going.

Report •

Related Solutions

April 8, 2009 at 21:25:40
Thanks for those sites, the colour coded diagram was the best I have seen are you aware of a similar one but for connecting to a wall point instead?

I'll give it a go tonight, much to the gf's dismay though, she tries to drag me into the house with promises of bedroom action but if my pc's are working i just can't relax, lol.

One morte thing, the crimping tools I understand are perfect for there job and do the two crimping sections at once, do you think i could achieve satisfactory results with pliers and a two bite approach?

Thanks again for your info/help mate :)

Report •

April 9, 2009 at 05:48:04
You have to have the correct tools. Forget about pliers.

That's the wall jack wiring. ^^

Put your gf before PCs. You'll be happy you did.

Report •

April 9, 2009 at 06:01:00
Pliers wil not work.

The RJ-45 crimper actually crimps the metal contacts that go down into the wire. Impossible to do that with a pair of pliers.

When crimping an RJ-45 end on a cable, make sure your wires go to the very end of the RJ-45 (as in, touch the plastic) to ensure proper contact and also, make sure the casing is under the crimp point.

Lazy people, or people who don't know better, don't get the casing in the crimp and then the wires pull out later on.

If I had a dollar for every RJ-45 I've crimped, and every wire I've punched on a patch panel or keystone, I would be retired!

One last thing, always test your cables after making them.

Report •

April 13, 2009 at 16:41:31
Thanks very much for all your help guys, I learnt 2 things from this exercise.

1) Check the simple things first
2) Don't assume that because pins on one component are marked 1-8 that the pins on another component which are also marked 1-8 will match.

I went home and put 2 cat5 cable ends on the 30m cable i had. I ddi use pliers because i was desperate and i used long nose pliers and was very delicate with it. The cable seemed to connect but i couldn't browse network. (lesson 1 here) the workgroup name was different = I'm an idiot :)

OK now i could see the cable worked, I took one end off and connected it up to the cat5 point and nothing, I spoke to an electrician firend, (lesson 2) disregarded the numbering and went with the colour coding which i now understood and away it went and there was much rejoicing.

So I now have internet in my gargage, thanks everyone for all your help I am as happy as a pig in poo.

Report •

April 13, 2009 at 17:04:49
That's good but I heard that pigs don't really like poo.

How do you know when a politician is lying? His mouth is moving.

Report •

Ask Question