Using 'spare' pairs?

Discussion in 'Home Networking' started by /Tx2, Sep 13, 2007.

  1. /Tx2

    /Tx2 Guest

    I've got an external building to which i've previously run a length of
    CAT5 cable.

    It is my understanding, that of the 8 wires within, only a few are
    actually used, despite all being connected....?

    Is it possible to connect these 'spare' wires to a second terminal block
    in the same faceplate to facilitate a 2nd network point?

    The spanner in the works for me, is that I run a gigabit network, which,
    AIUI, uses more pairs than 10/100


    /Tx2, Sep 13, 2007
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  2. Correct. Your common or garden network run will use two pairs - 1 & 2
    and 3 & 6.
    Technically, yes.
    Nup - an older Gigabit standard used all four pairs, but was discarded
    as being a pain in the arse. The modern standard uses the same pairs as
    100-Base-TX, which are the aformentioned 1 & 2 and 3 & 6. Gigabit is,
    however, more sensitive to things like near-end crosstalk and RFI/EMI
    interference - you may find that running two lots down a single cable is
    unreliable over long distances and you need to force it down to 100-Base-TX.
    Gareth R Halfacree, Sep 13, 2007
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  3. /Tx2

    Alex Fraser Guest

    Yes. Also, Google "cable economiser".
    What have you been smoking? 1000BASE-T (undoubtedly what the OP is using)
    uses all four pairs. In order to retain gigabit connectivity, the only
    options are to run another cable or add a switch.

    Alex Fraser, Sep 13, 2007
  4. Hmm. You're quite right - what the hell *was* I thinking of? Ah, well;
    the advice was worth what was paid for it. :p

    On a completely unrelated note, this is *very* nice beer.
    Gareth R Halfacree, Sep 13, 2007
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