What does it do?

Discussion in 'General Electronics Chat' started by iONic, Aug 12, 2008.

  1. iONic

    Thread Starter AAC Fanatic!

    Nov 16, 2007
    1,420
    68
    When I received a trial period for DSL internet access they gave me a bunch of these devices. The connect inline with the wall and your telephones.
    My question is, as there seems to be four identical sections to the circuitry, what are they and what do they do?

    Thanks
     
  2. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    DSL uses higher frequencies than the POTS audio range for communications. The circuits are probably low pass filters for remove DSL interference from the audio to and from the telephone receiver.
     
  3. roddefig

    Active Member

    Apr 29, 2008
    149
    0
    Seconded. Wikipedia has an article on DSL Filters: http://en.wikipedia.org/wiki/DSL_filter
     
  4. jpanhalt

    AAC Fanatic!

    Jan 18, 2008
    5,677
    899
    That's right. I had DSL. Here is an additional tidbit. I also has a very old telephone with carbon mic, etc. in the basement. It worked fine without the filter. The other phones needed it. John
     
  5. kammenos

    Active Member

    Aug 3, 2008
    127
    0
    Better use always filter for telephones. You may get less noise margin
     
Loading...