Can I convert a FastCat5e network cable into a crossover cable?

Discussion in 'Windows Networking' started by Sherri & Garry January, Jul 30, 2003.

  1. I ran a 10Base2 home network (2 computers) for several years but recently
    bought new network adapters and decided to switch over to 10BaseT at that
    time. A friend told me I could wire the PC's together directly thereby
    avoiding the need for a hub. However, he neglected to tell me I would need
    to use crossover cable, so I bought FastCat5e networking cable. I couldn't
    understand why my network wasn't working until I read this (or another)
    newsgroup yesterday and discovered I needed to use a crossover cable if I
    wasn't using a hub. Aggghhh! Ok, no big deal except that now I'm a little
    strapped for cash and won't be able to afford a hub and more networking
    cable for a couple of weeks, and I'm really needing/wanting to get this
    network running before then.

    Here's my question: Can I convert a FastCat5e network cable into a
    crossover cable by removing then rewiring/replacing the RJ45 connector at
    one end of the cable?

    Thanks for any advice anyone can offer.

    Sherri J.
    Sherri & Garry January, Jul 30, 2003
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  2. Sherri & Garry January

    AWM Guest

    You can do it with a bit of chocolate block connector or buy a cross over
    adaptor , or use an oridinary extension adpator with a short crossover patch
    cable you can get these from Maplin or even the big B&Q megastores.

    However you can buy a 4 or 5 port switched hub with DHCP for about 15
    pounds these days and a quick look under computer networking on ebay might
    turn up one for less than that --- A bit of a culture shock I can
    remember when a dumb 8 port hub cost hundreds of pounds.
    AWM, Oct 26, 2003
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  3. Sherri & Garry January

    Ted Guest

    Ted, Oct 27, 2003
  4. Sherri & Garry January

    Cisco_Kid Guest

    Here's a quick fix for you...

    Take your cat5 pacth cord and cut it in half. Then you can re-wire the pairs
    together to make it a cross-over cable without the need to re-terminate an
    RJ45 (although that is the best way to do it). Do you know your color codes?
    If not, here's how you would re-wire your cable...

    1 2 3 4 5 6 7 8 (pin numbers)
    w/o o/w w/g bl/w w/bl g/w w/br br/w re-wire these colors to these
    w/g g/w w/o bl/w w/bl o/w w/r br/w

    All you are doing is swapping pins 1&2 with pins 3&6


    Cisco_Kid, Oct 27, 2003
  5. Steven Campbell, Oct 27, 2003

    If you have cable making tools, a crimper and a plastic RJ45 end is really
    all you need, along with a razor blade to take off the plastic cover, then
    yes, you can cut the end off of a straight cable and rewire it into a
    crossover cable.

    You would normally wire a straight-thur as 12345678 & 12345678. The
    crossover has one end the same, so one side doesnt need to be changed. The
    other you have to rewire as 36145278. You can see that 4,5,7,8 stay the
    same, as they aren't actually used.

    If you dont have a crimper, and still dont feel like waiting for a crossover
    adaptor, you could try this:
    Anonymous Joe, Oct 27, 2003
  7. Sherri & Garry January

    CJT Guest

    With drop cables (including crossover) as cheap as they are, it rarely
    pays to homebrew, IMHO.
    CJT, Oct 28, 2003
  8. Sherri & Garry January

    nojunk.c.a.m Guest

    I brought a nice RJ45 crimper for only £8.99 last year (works as the stripper
    too). The plugs are only 10p each, so are the hoods. The crimper is chunky
    enough to last a fair few years, especially as the cutting blades are fully

    Once you have the crimper, you can make all the custom leads you want till your
    hearts content without the messy cutting, stripping, swapping, soldering and
    re-insulating you want.

    nojunk.c.a.m, Oct 28, 2003
  9. Sherri & Garry January

    CJT Guest

    Stranded Cat5 isn't too easy to find, though.
    CJT, Oct 28, 2003
  10. Sherri & Garry January

    Chuck Guest

    I'd second that. If you need the high performance of Cat5e, you need
    a reliable network connection. I roll my own sometimes for custom
    length cables, but if you're talking about a $10 crossover, just buy
    it. Much more reliable.

    I hate spam - PLEASE get rid of the spam before emailing me!
    Paranoia comes from experience - and is not necessarily a bad thing.
    Chuck, Oct 29, 2003
  11. Sherri & Garry January

    Mal Guest

    You can, if you like to wire your own. But the amount of time you'll spend getting it right, plus the amount of trouble you'll
    experience when you fsck it up (which will happen) (FastCat5e are very close tolerance), doesn't equal the amount of money you'll
    save by not buying a ready made and tested unit in the store.

    How long does it take you to earn $10 (5 pounds?)??
    Mal, Oct 30, 2003
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