Phone line plugged into "Internet" port on wireless router

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  • japlytic
    Badcaps Legend
    • Oct 2005
    • 2086
    • Australia

    #1

    Phone line plugged into "Internet" port on wireless router

    Months ago, I repaired a computer for someone. At her house, I found that the (inexperienced ) customer had plugged the phone line into the "Internet" port (which was actually for connection to an external broadband modem with Ethernet) on a wireless access point (without an inbuilt broadband modem).
    Certainly, this setup would not work and fortunately, the router was not damaged by that condition, because Pins 4 and 5 (which were connected to the phone line) were not internally connected in the router.
    I remember seeing a 3Com network card with a "No Phone" symbol on it - I think all wireless access points (without a broadband modem) intended for home and business should have a "No Phone" symbol on an Ethernet connector labelled "Internet", "Broadband", "Modem" etc.
    Last edited by japlytic; 11-26-2009, 03:56 AM. Reason: Network wiring
    My first choice in quality Japanese electrolytics is Nippon Chemi-Con, which has been in business since 1931... the quality of electronics is dependent on the quality of the electrolytics.
  • gdement
    Badcaps Veteran
    • Jan 2007
    • 690

    #2
    Re: Phone line plugged into "Internet" port on wireless router

    People used to do this a lot with laptops that had both modem/ethernet jacks on them.

    Apparently pins 4/5 are not connected on RJ45 ethernet. I don't know if there's any dangerous conflict on pins 3/6, which is in use by both.

    From what I can tell online, looks like you use the same RJ11 phone connection we use.

    Comment

    • washu
      Badcaps Veteran
      • Jul 2009
      • 310

      #3
      Re: Phone line plugged into "Internet" port on wireless router

      Pins 4/5 are used in gigabit ethernet, so it's not safe to assume they are unused on an RJ45 jack.

      Comment

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