How Can I Bring Up My SNR Margin?


When you are using a broadband Internet connection, it is important to minimize the amount of noise (interference) on the broadband line. If the noise is greater than the Internet signal, you experience slow and/or intermittent connectivity. Good SNR (signal-to-noise ratio) is the same for both DSL connections and cable modem connections. Ideally, the downstream SNR should be 30 or above. The upstream SNR should be 29 or above. If your SNR is too low, you can do a few things to get a stronger signal.

Things You'll Need

  • Router
  • Filters
  • Add a router to your broadband connection. The exact setup process for a router varies by router model but generally involves connecting the router to your modem's WAN, WLAN or Ethernet port (wording varies) via a compatible network cable.

  • Check the telephone jacks that are associated with your broadband line. Each telephone jack connected to a device (such as a fax, answering machine or alarm system) should have a filter connected to it. To identify a filter, look for a small square box device that has a telephone port. In most cases the filter is cream or white in color. Purchase additional filters from a local electronics retailer or contact your Internet service provider to get more.

  • Keep all network cables as short as possible. This includes Ethernet cables, telephone cables and power cables. The shorter the cable, the shorter the distance data must travel, resulting in a stronger signal-to-noise ratio.

  • Move your broadband modem (or router) away from all sources that may be causing noise interference. Interference sources include radios, televisions, cell phones and florescent lights/lamps.

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