Ethernet cabling problem

[HebbeLille]

Hi,
I have set up (trying to set up a basic home ethernet network, having one Linux machine and one XP box... Having them standing next to each other with a cable between it works just fine!

Now, I've just build my house, and I put in cat5 cabling from different rooms to one "lab-room" in the basement. I have checked using a multimeter that the cables are intact (all pairs).

The room with the XP host is having an outlet on the wall, and I connect the cat5 cable to this using the T568B standard. In the "lab", I've put on a RJ45-connector on the same cable using also the T568B standard.

I've got a green light on both the ethernet cards. But no communication possible...

If I remove the plug in the Linux-box, the light on the ethernet card in the XP-box is still green, however, if I only remove the plug in the XP-box, the light goes off in the Linux machine.

I have to say I'm a bit confused here - anyone that can help me get this small network up and running? What am I doing wrong?

Ps: I have checked over and over again that I have connected the outlet using T568B and the RJ45 using T568B. The cable going from the outlet and to the XP-box is the same I was using when the two machines where standing next to each other....

Reg.,
Helge
--xx--

 

[josephschmoe]

Are you wiring the 2 pc's directly without a hub or switch?

 

[franklin97355]

If you are connecting two computers together without a hub or switch you need a crossover somewhere in the circuit. Best place is between the wall jack and *ONE* of the computers.

 

[daronwilson]

Hmm, so, you have a crossover cable between the two computers when you having them sitting next to each other. Looking at that cable, it is 568B on one end, and 568A on the other end. It pretty much HAS to be that way if you are connecting the two machines together and they talk. And I'm assuming you have a green lite on each NIC. So, everything works with this one crossover cable between the two machines?

Now, you want to extend that connection. To do so, you need a straight cable assembly. I'm not completely sure how you are physically connecting the rest of it, but, assuming you have a modular jack on each end, and it is terminated 568B, on the other end you have a modular plug crimped onto the wire in a 568B fashion. You plug the m odular plug into one machine, and you use the crossover cable between the 568B wallplate and the other computer. That should work.

IF you have it wired that way, and it still doesnt work, you could be making a poor crimp on the modular plug. But, let us know more. If you are testing with a multimeter, disconnect the two computers, short pins 1 and 2 together at one end of the circuit. Go to the other end and you should have continuity on pins 3 and 6, showing that the pair is transposed (crossed over). Remove that short, and short pins 3 and 6. Check for continuity on pins 1 and 2 showing the transposition of the pairs.

That should get you there, please let us know what you find out!


It is only my opinion, based on my experience and education...I am always willing to learn, educate me!
Daron J. Wilson, RCDD
daron.wilson@lhmorris.com

 

[InnoTech]

becuase of the "link light" not going off it seems that either there IS a cabling problem or there just so happens to be a ethernet card problem. HOWEVER, they are right you must have a cross-over cable in the mix! depending on the type of network cards, i find it strange that they (the link lights)are even on.

if it is true that they were working fine before, then you must have a cross-over cable hooked up to the XP machine and it should be fine staying there.

 

[HebbeLille]

Hi, and thanxx for all the replies!!!

Just to clearify: I used the fixed cat5 cable between the two machines, and it worked perfectly. Now, to be able to move the Linux machine (the server ) into the lab, I'm unplugging it, putting the fixed cable into the wall jack (terminated 568B). The cat5 cable going from the wall jack is in the other end terminated 568B in a RJ45 plug. This plug I now put into the Linux machine. Now I expect it to work fine again... but it doesn't.

However, I'll double check the crimp on the RJ45 plug (but I did use the right tools conneting it) to be sure. I'll also get the Linux machine back in the same room as the XP box just to check that fixed cat5 (that should be twisted) again.

Stay tuned

Helge
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[HebbeLille]

Hi again,
Well - thanxx for your help, guyz! Now its up and running, and I'm kinda embarressed to say what the problem was... Actually, I was thinking a more complex than I had to, cause I used the connection schema that followed the wall jack, which "told me to" connect the brown on the far right, the brown/white on the next to the left... and so on. Well, the wall jack itself had its own colorschema on it, so all I had to do was follow that, and then it all worked!

However, I want to thank you again for taking the time giving me suggestions. You got me thinking about things to check, so instead of giving up I managed to fix the problem.

Helge
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