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Wireless Networks Thread, Split a network cable in Technical; Originally Posted by redsnappa The unused 4 cables in a Cat5 cable are there for a reason, to decrease crosstalk, ...
  1. #16
    petectid's Avatar
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    Re: Split a network cable

    Quote Originally Posted by redsnappa
    The unused 4 cables in a Cat5 cable are there for a reason, to decrease crosstalk, an increase in crosstalk would cause a reduction of the signal quality on any cable that was split as in the Micromart article.

    If the signal quality falls below a certain level the network speed would reduce to 10 Mbps through the auto negotiation process.
    How do these cables reduce crosstalk?

  2. #17

    Geoff's Avatar
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    Re: Split a network cable

    How do these cables reduce crosstalk?
    Twisting wires decreases interference because the loop area between the wires (which determines the magnetic coupling into the signal) is reduced. In balanced pair operation (as in Cat5/6), the two wires typically carry equal and opposite signals (differential mode) which are combined by subtraction at the destination. Thus the noise from the two wires cancel each other in this subtraction because the two wires have been exposed to similar EMI.

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    Re: Split a network cable

    Sounds silly to me, surely there'll be a problem with cross talk as there are more active wires????/

    just run two cables you cheap people :P, even we can afford them!!!

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    petectid's Avatar
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    Re: Split a network cable

    Quote Originally Posted by Geoff
    How do these cables reduce crosstalk?
    Twisting wires decreases interference because the loop area between the wires (which determines the magnetic coupling into the signal) is reduced. In balanced pair operation (as in Cat5/6), the two wires typically carry equal and opposite signals (differential mode) which are combined by subtraction at the destination. Thus the noise from the two wires cancel each other in this subtraction because the two wires have been exposed to similar EMI.
    "Wikipedia" Geoff

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    Re: Split a network cable

    why shouldnt you split a cable with a gigabyte link? (WORKSTATION?)

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    Re: Split a network cable

    ok sorry to cause such a debate. This is for home use would not dream of doing it at work. Also it stopped me getting a ear bashing from the misses RE mess time and wasting time that i could have been painting the fence. I was told that it could be dome on cat 5e and 6 only as the 4 spare wires are redundent unless using POE or 1gb lan in wich case i would not work. As for interferance if it is done right it should work fine. And it does took me 5 mins to do now kids have xbox and pc on network working fine and wii runs off pc via conection sharing. thanks for the help and the mrs is happy as well as i got the fence painted did not spend all day messing with poxy computers as she puts it.

  7. #22
    greenfieldsupport's Avatar
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    Re: Split a network cable

    Quote Originally Posted by badboyvtec
    why shouldnt you split a cable with a gigabyte link? (WORKSTATION?)
    My guess is with the increased rate there will be more crosstalk, which will further compound the problem of using all 8 wires in the cable..

    Same reason why you need an 80pin (40 real 40 shields) cable for fast IDE Drives rather than a 40pin....


  8. #23
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    Re: Split a network cable

    Quote Originally Posted by badboyvtec
    why shouldnt you split a cable with a gigabyte link? (WORKSTATION?)
    Because all 8 cables are used for gigabit, whereas only 4 are used for 10/100, therefore theoretically leaving 4 redunant cables.

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    alonebfg's Avatar
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    Re: Split a network cable

    not really if you consider the cat5e/6 is disigned for 1gb and the max you and send down 4 is 100mb X2 which is not as much data as it is designed for (sory about the spellings hope the fourm gets a spell cheack soon lol)

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    Quote Originally Posted by alonebfg View Post
    not really if you consider the cat5e/6 is disigned for 1gb and the max you and send down 4 is 100mb X2 which is not as much data as it is designed for (sory about the spellings hope the fourm gets a spell cheack soon lol)
    Google IESpell

  11. #26

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    Could try:

    Lindy UTP Port Doubler

    But you'll need two, so more expense.

  12. #27
    Butuz's Avatar
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    Quote Originally Posted by MYK-IT View Post
    Could try:

    Lindy UTP Port Doubler

    But you'll need two, so more expense.
    And they're rubbish. Your better off withn a cheap 4 port switch to be honest.

  13. #28
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    CPC are cheaper

    PRO SIGNAL|CAT 5 ECONOMISER|CAT 5 UTP DATA-DATA CABLE ECONOMISER | CPC
    BELKIN|R6G058B|BELKIN CAT 5 UTP CABLE ECONOMISER | CPC

    But you still need to buy a pair of them, we have a bunch of them around at work, for when someone breaks a socket.

    Never had any problems with them, and this means each connection has a 100mb link to the switch, when a small 4port switch ends up splitting the link so 50mb (or less) each.

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