Home network using phone sockets

Discussion in 'Home Networking' started by David Jones, Aug 28, 2004.

  1. David Jones

    David Jones Guest

    A few weeks ago I asked for help on the newsgroup and was given lots of
    constructive advice by members - the problem turned out to be a firewall. I
    have now suceeded in setting up a network between my 2 pc's by using a PCI
    card in each machine that connects directly into the nearest phone socket.
    So each machine can access the other's files and I can share a printer.
    BUT, whenever I use any of the house phones for either an incoming or
    outgoing call the broadband connection (which is via an Alcatel Speedtouch
    modem) drops out. I have a filter on each phone line that was supplied by my
    ISP - Pipex. Any thoughts?

    David Jones, Aug 28, 2004
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  2. you are using a HomePNA or similar network that carries over your
    phone cables in the house ?

    do you have a filter on each phone / fax / skybox ? you should have.

    is it any different if the networking stuff is unplugged from the
    phones ie does the ADSL still drop out when using a phone without the
    networking connected.

    Phil Thompson, Aug 28, 2004
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  3. David Jones

    David Jones Guest


    I have an Intellinet PCI phone network card in each of my 2 machines - they
    only cost about £11 each so it seemed a pretty cost effective way to set up
    a network. A flylead goes directly from each card into the telephone socket
    on the wall. I have a filter on each phone in the house and have tried
    removing all the filters - the broadband connection still drops out when the
    phone is used. As I am writing this the network is not connected and the
    broadband will drop out if the phone is used.

    The pc's recognise the PCI cards as 'AMD-PCnet Home based network
    adapters' - presumably a generic term. Interestingly BT are selling 'Home
    Networking 1200' that seems to work on a similar principle in that it uses
    PCI cards and a broadband modem and clearly states that you can use the
    existing telephone extension points in the house as long as they are on the
    same telephone line. Obviously I didn't buy my bits from BT so they may not
    be sympathetic to a request for advice. On the other hand I suppose I have
    nothing to lose by asking them.

    David Jones, Aug 28, 2004
  4. the filters are required on the phones, the symptoms you describe are
    those of low quality or faulty filters.

    The network is innocent as you have the problem with the PCI cards not
    plugged into the phone sockets - correct ?

    I would try removing all but one phone and getting a good quality
    filter on that as a starter. You may also find a microfilter on the
    ADSL modem connection helps (if it isn't on one already) - try
    borrowing one off a phone and leaving the phone unplugged.

    Does your modem give you any SNR or line quality stats ?

    (there isn't any other phone/fax/PC modem/Sky box/analogue PC modem
    etc on the line that isn't filtered, I assume)

    http://www.adslguide.org.uk/hardware/reviews/2003/q2/bt-1200.asp is a
    review of the BT kit, it concludes "whilst HomePNA only runs at up to
    10Mbps, the sharing of the connection over the phone is stable and
    happily co-exists with the ADSL signal."

    http://www.bt.com/homenetworking does have some resources that show
    configuration of networks etc, but we know its not the network :)

    Phil Thompson, Aug 28, 2004
  5. David Jones

    David Jones Guest


    The filters are as supplied by Pipex - 'DSL Filter; Excelsus Z-blocker Model
    Z-420UK-A' They cost about £8 each I think. Is there a British Standard
    for filters? Must say that filter quality is not something I had
    considered. I will have another fiddle once I can raise the energy to crawl
    under the desk and reach behind the filing cabinet to get to the socket

    Thanks for your suggestions.

    David Jones, Aug 28, 2004
  6. Phil Thompson, Aug 28, 2004
  7. David Jones

    AJ Guest


    Check these out Dave, I have known quite a few failures of the stock BT
    ADSL filters, these ones stopped line dropping and interference on the
    phone line when I fitted them to my ADSL set up.

    The line has not dropped (except when my wife unplugged it by accident!)
    on my Pipex connection since I installed them.(getting on for 12 months

    AJ, Aug 29, 2004
  8. David Jones

    David Jones Guest


    Thanks for your thoughts. I popped down to my local Computer Fair today and
    they only had unbranded filters at about £4 so I left them there! Just
    visited the site you recommended and have decided to bite the bullet and
    invest in their quality filters - I'm too far down this road to do

    David Jones, Aug 29, 2004
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