Crossover cable, not working (Kind of)
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Posted by Jimmythekey on December 7, 2004, 7:16 pm
Please log in for more thread options I've recently made a crossover cable(30m) to connect between 2 laptops. I can't get it to work. I have an IBM thinkpad, and my friend has a toshiba something or other. As far as I can see both NIC's are installed correctly with file and print sharing enabled etc. Here is the strange part, I brought the cable into work to test it, I connected a desktop PC to one of the workers laptops and got a FULLY functional connection, with pinging and file transfer successful. So now I thought one of the NIC's in one of the laptops was faulty. I brought my laptop into work and low and behold I can't get a connection between my laptop and my desktop PC. However, I connected the patch cable from the office into my laptop NIC and all of a sudden I have fully functional network access. So here is the overview. 1. Crossover between myself and my friends laptops (FAILURE) 2. Crossover between computer desktop and work laptop (SUCCESS) 3. Crossover between computer desktop and my laptop (FAILURE) 4. Patch cable from work network into my laptop (SUCCESS) What the hell is going on ? My thinkpad is a 1999. Is there a possibility that my workmates new laptop is able to detect a bad crossover cable wiring and re-transmit the signals on different pairs to get a successful network connection ? Confused, Ronan Walsh. | |||||||||||||||||||||||||
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Posted by Robert Redelmeier on December 8, 2004, 4:08 am
Please log in for more thread options Yes, it is confusing. If the workmates new laptop has gigabit, there's an excellent chance it has auto-MDI and can correct for crossover. You may well have a straight patch cable. Check by looking carefully through the plastic at pin 2 (2nd from left, tab down, plug pointing away) on both ends. It should be different for a proper crossover cable (orange vs green). If you have two oranges, you have a regular patch cable. -- Robert | |||||||||||||||||||||||||
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Posted by Jimmythekey on December 7, 2004, 8:34 pm
Please log in for more thread options I don't think it's a patch cable, but the cable might be faulty (might
have followed a dodgy diagram). I'm re-crimping it now, so I'll see how that goes. Thanks. Ronan. | |||||||||||||||||||||||||
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Posted by Jimmythekey on December 7, 2004, 8:38 pm
Please log in for more thread options I don't think it's a patch cable, but the cable might be faulty (might
have followed a dodgy diagram). I'm re-crimping it now, so I'll see how that goes. Thanks. Ronan. | |||||||||||||||||||||||||
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Posted by Jimmythekey on December 8, 2004, 1:25 am
Please log in for more thread options Ok guys, here is where it gets weird.
I got a small patch lead (Straight through) and connected it from my desktop computer straight to my laptop. I got a connection and could ping. Is that not a bit weird to anyone else ? I then thought, I'll just re-wire my crossover cable to a patch lead and I'll be sorted ! However, I re-wired my 30m crossover cable to a 30m patch and when I connected NOTHING happens. Damn this is annoying me. I even got a multi-meter and checked pin for pin that they were all getting a signal. I don't think it's the length of the cable as it did work when connected from desktop computer to another work laptop. This is really confusing ... help. Ronan. | |||||||||||||||||||||||||
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> 2. Crossover between computer desktop and work laptop (SUCCESS)
> 3. Crossover between computer desktop and my laptop (FAILURE)
> 4. Patch cable from work network into my laptop (SUCCESS)
>
> My thinkpad is a 1999. Is there a possibility that my
> workmates new laptop is able to detect a bad crossover cable
> wiring and re-transmit the signals on different pairs to
> get a successful network connection ? Confused,