Wired ethernet jack works on some computers, but not others.

[KAPtax1st]

I recently hardwired an ethernet cable to a room. Signal tester shows good connection, so the line itself is good. I have plugged in two different computers and I don't get any connection. The computer says there is no LAN cable plugged in. I had someone out to look at it and they plugged in their (older) laptop and he got a great connection. He had no suggestions on what to do. Both of the computers work fine ob other hardwired connections in the house.

 

[millwright]

Got to be the wire.

The only thing I can think of, why some work and some don't, is gigabyte networking is involved.

Or it is wired wrong.

100Mbps uses 4 wires, and Gig uses all 8.

 

[KAPtax1st]

First, excuse my lack of knowledge...I am not super tech savvy. It has 8 wires/connections. The only other thing (which I don't know how to test) is that the cable bundle runs along a 6" thick beam under the house with a couple electrical lines on the other side of it. Possible interference?

 

[millwright]

Twisted pair is supposed to eliminate interference, in 3'.
As long as your wire is longer than 3' it should be OK.
It also can't be longer than 325'.

I would just about guarantee it is something to do with the wire.
You can get a cheap tester, that will check the individual wires.
Did a staple damage the wire.
I have run at least 2000ft of the stuff, and it isn't rocket science.

Both ends are identical, not a mirror image.

It doesn't even mater if you make up your own color code, as long as both ends are the same.
Of course the next guy to come along will curs you if you don't use the standard color code/order..

 

[KAPtax1st]

The cable was run during remodel and is in a bundle with another CAT5 and a couple coax cables inside a plastic sheath. The only possible damage could be a screw during drywall install that I can't see. This particular cable has been setting for a few years and just now putting internet in that room. Not sure if it's "twisted"; just 8 wires inside the insulation, each color is one solid copper wire inside it's own insulation. I had a local internet guy make the connections (although he is not my ISP). The end that plugs into the router seems to match the pattern I have looked up elsewhere on the net (orange to one side moving to brown on the other, but the greens not next to each other.) The jack is a punch down type and each color is in the proper spot according to the color coding on the sides (though the jack shows two different options?). I did purchase a tester from Monoprice and I get 1 through 8 in sequence on each end. The run is about 20'.

 

[millwright]

All cat 5, 5e, and 6 are twisted pair.

The greens are not supposed to be together.

There is an A and a B wiring scheme.
Not sure why, but I use B, as that is what cables you buy are.

Looking at the side with the contacts, opposite from the clip left to right
Orange stripe, Orange, Green stripe, Blue, Blue stripe, Green, Brown stripe, Brown,

When you use this order, you must use the B chart, on the punch down, terminal.

The order isn't really important, except as a standard, the important thing it that both ends are identical.

Edited
sorry I had My A and B mixed up again.

http://www.techeez.com/network-info/create-patch-crossover.html

 

[KAPtax1st]

I put a new jack on the end and it is working. Thanks for your help.

 

[millwright]

You're welcome.

 

[mdd1963]

It doesn't even mater if you make up your own color code, as long as both ends are the same.

You might get away with that for 10/100 MB connections, but, I hope you are not involved in building cables for real networks.

There are standards for a reason, the twisted pair principle reduces crosstalk.

Recommend you and the OP read this:

http://cablesupply.com/content/8-ethernet-wiring-color-guides

 

[millwright]

How delightfully condescending.
Nothing in your link, or video I haven't seen many times.
If you are referring to the importance of color coding, check my second post.

 

[mdd1963]

Better to be condescending, and correct, than the alternative, and telling folks as long as the wires match at both ends, it doesn't matter.

It absolutely does matter.

 

[millwright]

Yep, you really added to the already fixed post.

Edit
After posting the color codes, and telling of the importance, of using the color codes,
I'm sure most people can see what my comment was about.

It seem to have completely eluded you.
That's what happens when you are only taught the colors, and not the whys, and how it works.

 

[KAPtax1st]

Yes, milwright, I understood what you were saying. Coding is important, but the wire itself does not know if its green or red. Your help was clear and helpful. Thank you again.

 

[millwright]

Thank You.