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Wireless Networks Thread, None of the network cable I cut is working in Technical; There's something odd going on that I'm having trouble getting to the bottom of. Every single cable I'm cutting doesn't ...
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    None of the network cable I cut is working

    There's something odd going on that I'm having trouble getting to the bottom of. Every single cable I'm cutting doesn't work. I've cut hundreds of cables in the past, so I'm pretty sure it's not me being inept.

    I'll run through what I'm doing so that anyone else can jump in and call me thick:

    Cut wire to appropriate length.
    Trim half an inch of outer sheath off the end.
    Split cables into sequence: w-o, o, w-g, b, w-b, g, w-b, b
    Straighten up wires and trim off a few mm of the end so they're all the same length.
    Feed into connector and after a final check to see that the cables are in order, crimp.

    I'm experiencing different symptoms. Some computers will pick and drop the connection continuously, others won't see anything at all. Using a desktop switch (we don't have proper testers) the cables will sometimes light up, and other times not.

    Am I missing something glaringly obvious?

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    matt40k's Avatar
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    Assuming the cable looks ok after crimping. Does the crimp appear to be crimping correctly? If so, you might have got a bad batch of connectors. The cables sequence isn't really important, so long as you get it the same both ends.

    I assume it's not over 100m (lol if it was), not a faulty switch\NIC. If your just using a switch, have to tried using the cable between a computer and a switch. Switch to switch could cause loopback and the ports SHOULD be disabled.

  3. Thanks to matt40k from:

    fafster (5th November 2008)

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    ninjabeaver's Avatar
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    At my old job, my crimping tool where it pushed the metal pins through the cables had bent out slightly causing the pins either to not push through at all or just bend.

    Might be worth investing in a new crimp tool and get yourself a little tester as well. I've seen them quite cheap now for a basic lights on off tester.

    Cabling order is spot on as you know.


    EDIT:- http://cgi.ebay.co.uk/ws/eBayISAPI.d...e269a2fff5ba0d Cheap Tester

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    fafster (5th November 2008)

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    plexer's Avatar
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    Buy proper certified patch leads problem solved.

    Ben

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    dirtydog's Avatar
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    Ive had this before, I went back and crimped them extra hard and problem solved.

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    I think I may have to purchase a load of patch leads.

    Cheers for the replies all. The connectors are all new, though I've tried both old and new cable. It's either the crimping tool or connectors, methinks.

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    tech_guy's Avatar
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    Yes, we had a silmilar issue with a crimping tool; unless you squeezed it really hard you never got a good connection. Binned it and got a new one and the problem was solved.

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    plexer's Avatar
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    I presume you are crimping stranded cable and not solid core?

    Ben

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    contink's Avatar
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    Think I might know what it is...

    There's two different types of RJ45 plugs that you can get... A bog standard one and the AMC (think that's the brand).. They use slightly different crimping dies and won't work properly with the other plugs ones unless you're very lucky.

    I hit the same problem with an order of plugs from toolstation that were AMC and I didn't know about the difference until I started doing some searching and then looked very carefully at the plugs for any ID markings.

    My solution was to buy a two crimpers with interchangeable heads for the different types and then just grab both heads and one crimper. Works great now.

    I'd definitely recommend getting a cheap (£8) cable tester though from somewhere like toolstation, screwfix or even eBay... it makes you're life sooo much easier with stuff like this.

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    DSapseid's Avatar
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    Yes i had this as well and it was the crimping tool that was busted.

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    Butuz's Avatar
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    I gave up mass crimping several years ago. Patch cables are so cheaop now that it simply was not worth my time sitting there for an hour just crimping and cutting and trimming.

    I still do the odd crimp if I need a really long patch cable or something out of the ordinary. But 0.5 - 10m gets bought.

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    SpuffMonkey's Avatar
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    Yep - buy them. Well worth getting a decent tester - we bought a NetCat Pro and for the price its excellent - even tells you the distance to the break.

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    tech_guy (6th November 2008)

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    If you suspect your crimp tool you can try getting a small flat head screw driver and (lightly) hammering each of the pins on the RJ45 to ensure it has penetrated each conductor of the CAT5.

    And the order is very important, simply matching both ends will make for extremely unreliable patch leads.

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    matt40k's Avatar
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    Quote Originally Posted by james_yale View Post
    And the order is very important, simply matching both ends will make for extremely unreliable patch leads.

    Perhaps you could explain. All the pairs are the same diameter, same material etc. Otherwise there would be more types of cable. The simple reason why you use a standard coding is the same as why you use standards.

  18. #15

    plexer's Avatar
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    It's to do with crosstalk on pairs.

    How to wire Ethernet Cables

    Ben



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