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I can't connect my 2 PC's, can anyone help me? :-(
NunoM Jan-12-01 05:01 PM
I'm trying to connect 2 PCs but with no success so far.

I have one AMD450Mhz with one Genius GF100TXR III Series board and one PENTIUM200MMX with one Genius GF100TXR II Series, both PCI-Bus Adapter.

I already tried to install, unistall and install again the TPC/IP, IPX/SPX and NetBEUI protocols but I can't get the network working.

I purchase a crossover cable CAT5 with 15 meters. The NIC I think that is working because when I turn the 2 PC's on, both green lights are on, but I can't get the other ( send and receive ).

I saw the manual board and I saw only reference to connect the NIC to one HUB and no connection PC to PC.

This means that my Genius GF100TXR II/III Series boards only works with one HUB? The crossover cable doens't work with every NIC?

If the problem is the HUB, what kind of HUB is better? 10BASE-T or 100BASE-TX?

Or my problem is not the cable itself?

Please, can anyone help me?

Thanks for your time, and sorry my english


1. RE: I can't connect my 2 PC's, can anyone help me? :-(
lbyard Jan-12-01 07:03 PM
In response to message 0
A good crossover cable works as well as any hub or switch (http://duxcw.com/faq/network/hubsw.htm) and with any 10/100BASET Ethernet adapter. I keep seeing this fallacy that crossover cable is not as good a hub or switch and straight-thru cables all over the Internet. It simply is not true, and it is obviously authored by inexperienced people who donít know how they work and/or donít know how to make cables. An adapter canít tell the difference between a hub and a crossover cable except that it can determine that it can operate at full duplex as it would with an Ethernet switch. If the crossover cable made correctly, the adapters are OK and installed properly, and the network software is installed and configured correctly, the network will work. Iíve done it many hundreds, if not thousands, of times with all sorts of Ethernet adapters.

Is the cable made correctly? If you donít see solid Link and blinking Activity LEDs on both network adapters, probably not. Look at these pages to determine if the RJ45 plugs are wired correctly:


Please come back if you need more help. Larry

2. RE: I can't connect my 2 PC's, can anyone help me? :-(
NunoM Jan-13-01 11:52 AM
In response to message 1
I see the green light in both PC's ( when they are ON together ) but I can't see the blinking light, that's the problem.

This is my first network and with the instructions in this site ( very good ) i tought that it would be easy.

I already test the cable with one multimeter and the connections works, from one side to the other side.

Now that I know that I don't need a HUB, the problem must be from configurations right?

Where should I start searching for answers to my problem?

Thanks for your help,
Best reggards


3. RE: I can't connect my 2 PC's, can anyone help me? :-(
lbyard Jan-13-01 07:39 PM
In response to message 2
LAST EDITED ON Jan-13-01 AT 07:44 PM (GMT)

Pins 1 and 2 should be connected to pins 3 and 6 using wires in the same pair, and 3 and 6 should be connect to 1 and 2 using wires in the same pair (see http://duxcw.com/digest/Howto/network/cable/cable5.htm for the pin-out). A continuity check with multimeter does not always guarantee a good cable or that it is wired correctly. The cable runs at radio frequencies, not DC. Letís first be sure the problem is not the adapter cards or cable. Most network adapters come with a floppy disk that has a diagnostic program on it. Suggest running it. The loopback test will fail without a loopback connector, and it is not consequential. Larry

4. RE: I can't connect my 2 PC's, can anyone help me? :-(
NunoM Jan-14-01 10:02 PM
In response to message 3

Ohhh noooooo!!!

I think you right, I used the diagnostic program and I got this results:

NIC Register Test - OK
Loopback Test - FAIL
Network Speed - 100 Mbps
Cable Test - OK

So, the problem resides in "Loopback Test", I went test the cable and guess what?
The man where I bought the cable, made the cable backwards, see the connections yourself.
( I went to the store with the schematics - "Dux Computer Digest" Page - and the man made the
wrong connections, this is the problem when we don't do it ourself )

My "Wrong" Cable
1 1
2 2
3 7
4 4
5 5
6 8
7 3
8 6

Please, tell me if this is the right connections ( I saw the pictures in http://duxcw.com/digest/Howto/network/cable/cable5.htm )

1 3
2 6
3 1
4 4
5 5
6 2
7 7
8 8

I'm gonna try to fix this problem and test the network again, stay in touch please

Best Reggards


5. RE: I can't connect my 2 PC's, can anyone help me? :-(
lbyard Jan-15-01 01:11 AM
In response to message 4
All of the diagrams in the cable article are absolutely correct. There is more to it then just getting the wires connected to the right pins. I would find someone else to make the next one. Also, when I make cable I test it on my network. Larry

6. RE: I can't connect my 2 PC's, can anyone help me? :-(
NunoM Jan-17-01 12:58 PM
In response to message 5

I don't know what to do now, I went to another store ( Pc store ) to make the connections but still doens't work.
The connections ( pins like http://duxcw.com/digest/Howto/network/cable/cable5.htm ) are:

1 1
2 2
3 6
4 4
5 7
6 3
7 5
8 8

This cable is correct?
Or it's wrong again? There are more than one way to make a network cable?

Now I get the following message when I run the diagnostic test that cames with may ethernet board:

NIC Register Test - OK
Loopback Test - FAIL
Network Speed - ----
Cable Test - FAIL

What should I do now?

Best Reggards

7. RE: I can't connect my 2 PC's, can anyone help me? :-(
lbyard Jan-17-01 06:59 PM
In response to message 6
Please read HOW TO MAKE YOUR OWN CAT 5 TWISTED-PAIR NETWORK CABLES at http://duxcw.com/digest/Howto/network/cable/cable1.htm and, in particular, look at the diagram at the top of the page on Color Code Standards. That article will answer the questions in your last post. Find another shop or tell me how long a cable you need with credit card (Visa or Master)info in an E-Mail, and I'll make a cable for that will work. Cost will be $4.95 plus $.20 per foot beyond six feet plus shipping and handling. Or mail a check to the address in our Contact Info page. To send an E-Mail to me simply click the little square next to lbyard above. Larry

8. RE: I can't connect my 2 PC's, can anyone help me? :-(
NunoM Jan-19-01 12:59 PM
In response to message 7
Hi Larry, me again

The problem is the cable, a friend of mine give one cable to test my network and.. it works, so my problem was always the cable but.. in one PC i still get one error messagem "LOOPBACK - ERROR" but i can browse the network and even play games ( I already test both ), what does mean LOOPBACK?
Can I work my network this way? Could I have a problem that I not detected so far?

9. RE: I can't connect my 2 PC's, can anyone help me? :-(
lbyard Jan-19-01 03:48 PM
In response to message 8
I assume that you are getting the loopback error when running the network adapter diagnostics? That test will fail without a loopback plug to the network adapter, and is of no concern. A loopback plug directly connects a network adapterís transmit pins with its receive pins (see the top of http://duxcw.com/digest/Howto/network/cable/cable5.htm). The test send stuff (packets) out the transmit pins and looks for it on itís receive pins. That tests the transmitter and receiver on the adapter. Larry

10. RE: I can't connect my 2 PC's, can anyone help me? :-(
NunoM Jan-20-01 11:05 PM
In response to message 9
LAST EDITED ON Jan-20-01 AT 11:15 PM (GMT)

Hello again

I connected my 15 meters cable like the cable of my friend, the only diference now is only this, my cable has 15 meters and send but do not receive any kind of data. My cable friends has 7 meters long and send and receive all kind of data. So, now my problem is the lenght of the cable? Could this be a problem now?

I mesure the resistence of the two cable, in my cable I've got 1.6ohm, in the cable of my friend ( half of my cable ) I've got 1.0ohm, this influence the transfer of data?

My cable is CAT5 type so what is wrong now?

11. RE: I can't connect my 2 PC's, can anyone help me? :-(
lbyard Jan-21-01 02:38 PM
In response to message 10
If the cable is made from CAT 5 cable with a solid vice stranded wire, the problem is not the length of the cable. The specification allows a cable length of up to 100 Meters (328 feet or about the length of a football field) for 100BASE-TX using solid core wire. Stranded cable cables should not be longer than 3 Meters (about 10 feet). I have made crossover cables that were much longer than the one you have and they worked just fine. If you are referring to the cable with the pin-out in your January 17th post, the cable has the wrong pin-out. Please read the reference material in my response to that post.

The answer to your question is that the problem all along has been cables that are not made correctly. The problem will not be fixed until you get a cable that is made correctly. Please read the reference material, buy a cable that is made properly (and have it tested by the vendor in a networkócopy 100 Mbytes from computer to another), and then please come back and tell us that it worked in your network. Thank you. Larry

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