Crimping

Discussion in 'Networks' started by Mr.Cheeks, Jun 23, 2007.

  1. wizard

    wizard Petabyte Poster

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    Time to make one up :D
     
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  2. Kitkatninja
    Highly Decorated Member Award 500 Likes Award

    Kitkatninja aka me, myself & I Moderator

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    When we need to install new network points, we actually get our local electrican to do the cable runs and then we do the termination at the patch panel and face plates (cheaper than getting a company in to do it).

    They are quite good, they'll do their best to either undercut or price match any item you give them (provided it's a valid quote).

    -Ken
     
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  3. Sparky
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    Sparky Zettabyte Poster Moderator

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    Yeah, we do some cabling ourselves. When it is an old building drilling a hole through a wall can take hours. In some cases we have had to drill a hole at each side of the wall and hope they meet in the middle, need to measure carefully!

    Newer buildings are not so bad! :biggrin
     
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  4. Kitkatninja
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    Kitkatninja aka me, myself & I Moderator

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    Know what you mean, false cellings, plasterboard walls, better runs :)

    -ken
     
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  5. Stoney

    Stoney Megabyte Poster

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    This is a pretty good tutorial for making your own Cat5 cables. Also gives a nice diagram for the wiring standards 568-B and 568-A which can be used to make patch cables or cross-over cables.

    HTH
     
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  6. juice142

    juice142 Megabyte Poster

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    And if they don't you get two holes for the price of one.

    Ah, the old ones aren't necessarily the best... :rolleyes:

    :biggrin

    J.
     
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  7. Spilly

    Spilly Kilobyte Poster

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    The trick is to strip at least 3-4 inches of the PVC off and then untwist each pair and then straighten them first at this length.

    Put strands in order then trim to size before sliding into the plug.
     
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  8. hbroomhall

    hbroomhall Petabyte Poster Gold Member

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    Er - not any longer. This was fine in the old days, but doing this with Cat5e will guarrantee that the resultant cable will fail 5e tests.

    The very minimum of cable should be untwisted these days.

    And - to address the OP (Hi Mr Cheeks!) WTF are you doing building cables? It is much easier these days buying certified cables than building them!

    Harry.
     
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  9. Mr.Cheeks

    Mr.Cheeks 1st ever Gold Member! Gold Member

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    Harry.

    i know its easier, but i have loads of cable anyway, and to re-route my cabling that i've patched myself makes the job that little bit more special...

    on the plus side, it always good to learn sometime new and expnd your knowledge. even if i may not be patching cables up all the time...
     
  10. r.h.lee

    r.h.lee Gigabyte Poster

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    Harry,

    I don't think it's fair to say "but doing this with Cat5e will guarrantee that the resultant cable will fail 5e tests." You don't know unless you subject the cable to a certified Category 5e tester.

    If you look inside the RJ-45 connector, there's basically two sections: 1) the "crimp zone" where the UTP jacket can go into and 2) the contacts zone where only the untwisted UTP wires can go to. BEFORE you crimp, you can insert the untwisted cable end into the connector to see if the untwisted part is short enough so that the UTP jacket reaches the boundary between the "crimp zone" and "contact zone." If the UTP jacket doesn't reach the boundary, then pull the connector off then give the untwisted wires a "haircut" by like half a millimeter or so. Then reinsert the UTP back into the RJ-45 connector. If the jacket now reaches the boundary between the "crimp zone" and the "contact zone" then that should be as reasonably short as possible for the untwisted cable end should be. On the other hand, if you gave the UTP cable "too much of a haircut" then you should cut off the untwisted part of the cable, restrip the jacket, untwist the wires, then start again. Once you're satisfied that the wires are short enough so that the jacket reaches the zone boundary yet the wires are long enough to reach the contacts, then crimp away.
     
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  11. r.h.lee

    r.h.lee Gigabyte Poster

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    Stoney,

    Technically 568-B is too broad. 568-B.2 covers copper cabling.
     
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  12. hbroomhall

    hbroomhall Petabyte Poster Gold Member

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    True - but those testers cost a *lot* of money! So how do you know you have done it right? :biggrin Trying it on a link and looking for errors doesn't always work.

    The company I work for now insists on pre-made patch cables with a cert of quality, rather than making up the patches as required. They found just too many marginal cables.

    Harry.
     
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