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Ethernet and vdsl over single cat3 cable

  • 12-12-2017 9:56am
    #1
    Cork981
    Registered Users, Registered Users 2 Posts: 799 ✭✭✭


    I have a single cat 3 cable running through our walls from the front to back of our house.

    I want to move the modem to the back of the house and have an Ethernet connection available at the front of the house without the need for new cables.

    A solution would be to us a single pair from the cat3 cable and the remaining 2 pairs for Ethernet.

    How much of a problem would interference be ?

    I’m currently synced at 70/20 but with over 100 million fec errors per 24 hours but only roughly 3 CRCs per day so the router is doing a good job at fixing frames, SNR margin is about 9-10


Comments

  • #2
    KeRbDoG
    Registered Users, Registered Users 2 Posts: 4,335 ✭✭✭KeRbDoG


    So you would use one pair for the phone line which VDSL is running and the other two pair for ethernet.

    In terms of ethernet, Cat3 spec suggests that it would only support 10Mbps rather than 100Mbps which a Cat5+ spec cable can run over two pairs.

    I'd be in the 'suck it and see' camp in terms of interference between the phone line and ethernet pairs :)


  • #3
    ED E
    Registered Users, Registered Users 2 Posts: 36,170 ✭✭✭✭ED E


    Problems:
    1.
    10Mb cable
    Half the carriers, 1/10 the bandwidth by convention - 1Mb cable.
    2.
    Vectoring wont have a clue whats going on
    3.
    Both occupy the bottom end of the spectrum, not sure of the relative PSDs but a network architect could tell you.


  • #4
    KeRbDoG
    Registered Users, Registered Users 2 Posts: 4,335 ✭✭✭KeRbDoG


    if you take two of the pairs of a Ca3 cable and crimp to pins 1-2 with one colour and 3-6 with the other into a RJ45 connector both ends (depending on cable, quality, twists) would that not come up as a 100Mbps link? Would it perform like a 100Mbps link is another question


  • #5
    ED E
    Registered Users, Registered Users 2 Posts: 36,170 ✭✭✭✭ED E


    If it were CAT5 or very short CAT3 it would yeah, but a significant run I wonder if the link would come up at all.

    *It could be CAT3 certified but over specced and get away with it, similar to 5 the conforms to 5E.


  • #6
    Cork981
    Registered Users, Registered Users 2 Posts: 799 ✭✭✭Cork981


    ED E wrote: »
    If it were CAT5 or very short CAT3 it would yeah, but a significant run I wonder if the link would come up at all.

    *It could be CAT3 certified but over specced and get away with it, similar to 5 the conforms to 5E.


    Link has come up a 100mb using the two pairs fortunately.

    Only thing is my line stats are gone crazy with an upstream attentuation of 0.0db.

    SNR is stil holding strong though.


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