DSL Filter Question?

Discussion in 'iMac' started by DougY, Oct 29, 2011.

  1. DougY macrumors 6502

    Dec 2, 2009
    Ive been having internet connection problems lately, and I think Ive narrowed it down to my DSL Filter. AT&T Tech Support thinks the filter may be the problem, so I took it out of line. With it offline, my connection has been consistent all day, no disconnects. My question is, how many of you use DSL Filters between the wall jack and the computer? Should I replace it, or just not use one? :confused:
  2. AuroraProject macrumors 65816


    Feb 19, 2008
    Right there
    The filter is actually for the phone, the modem prefers an unfiltered line. The filter is designed to keep unwanted noise out of your home telephone system, the one at the modem is a combo splitter/filter. So you will be better off connecting the modem straight to the wall.
  3. gr8tfly macrumors 603


    Oct 29, 2006
    ~119W 34N
    I'm assuming by "computer" you mean the DSL modem, which then connects to your computer.

    I wouldn't imagine you would have a connection at all. The filter is meant to be installed inline for phones. It's a low-pass filter (re: audio frequencies), so the DSL portion of the signal is greatly attenuated.
  4. Spike88, Oct 29, 2011
    Last edited: Oct 29, 2011

    Spike88 macrumors 6502a

    Jan 25, 2010
    Perhaps its wording in your question...

    For my home system, vision:
    - Main line comes into my home and terminates onto a demarc point (entry panel).
    - Demarc point splits into 2 different sub panels.
    - One panel (call it phone panel) is wired to every phone jack in my home.
    - The other panel (call it DSL panel) is only wired to my DSL Jack.
    - Between my entry panel and Panel 1 (phone panel), I have a DSL filter (hard wired in). Thus, every phone in my home has a filter (instead of a filter at every phone jack or wall outlet jack).
    - Between my entry panel and Panel 2 (DSL/computer line), its a direct wire connection.
    Thus, NO filter on the computer (DSL modem) line.

    For more details of DSL filter (on the phone line only), surf:

    As stated within the above URL, "Do not place a DSL filter on the phone cord that connects from the wall outlet to the back of your DSL modem! If you put a filter on this line, your DSL will not work because the filter strips out the DSL signal your modem needs to connect to the Internet".

    Hope this helps...

  5. DougY thread starter macrumors 6502

    Dec 2, 2009
    Thanks much!

    Thanks very much to all of you who responded. This forum is a great source of information, I appreciate your help!
  6. mellofello macrumors 65816

    Feb 1, 2011
    Former telco technician here.

    As was stated before please do not place a filter before your modem. These filters are strictly designed to filter out the noise caused by the circuitry of other equipment on the line.

    If you want to be sure to have the clearest signal on your line, then have a technician install a DSL Splitter in your NID (phone box on side of house). This will split the signal before it comes in, and give a dedicated data line directly t your modem. The added benefit is that you will no longer need filters on your phones since the signal is split at the box.

    In my experience 80% of DSL trouble was caused by bad wiring in the home, or customer error(plugging filters into modems, or using no filter etc).

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