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SNR Margin Change ?

Discussion in 'Networks & Internet Connectivity' started by mattreay, 19 Jul 2006.

  1. mattreay

    Associate

    Joined: 9 Mar 2006

    Posts: 53

    I have just bought myself a Draytek 2600 Plus to replace my D-Link 602T in the hope i will have better line stability with my normally very low SNR. The typical SNR reading on my old D-Link was between 8 and 10 connected to one extension cable from the master socket. My new Draytek connected to the same extension cable has a constant SNR reading of 18-19.

    Previously my connection would drop intermittently, sometimes once a day, sometimes several times a day, presumably because of the low SNR. After having this router for a week my connection hasn't dropped once.

    Is this possible for the SNR to increase because of a change in modem? Or is this mearly a co-insidence or ever an error in the modems recording the values?

    Any suggestions would be apprechiated.

    Thanks, Matt
     
  2. tolien

    Caporegime

    Joined: 16 May 2003

    Posts: 25,368

    Location: ::1

    Yes it's possible. Different modems (even different firmware versions) can have different bit allocation processes.
    By that much would seem odd though.
     
  3. mattreay

    Associate

    Joined: 9 Mar 2006

    Posts: 53

    Just retried my old modem to see if there had been a change in my line or anything. The SNR once DSL was sync'ed was 17 but quickly dropped to 10 within about a minute. Upon reconnecting my new modem the SNR was once again 17 and has stayed there for the past 5 minutes as it has done for the past week. Sounds like my old modem may have been faulty to cause that much of an increase?
     
    Last edited: 19 Jul 2006
  4. tolien

    Caporegime

    Joined: 16 May 2003

    Posts: 25,368

    Location: ::1

    Sounds like it, though as ever what it reports in its UI isn't always what it reports to the DSLAM, or has any connection to reality.
     
  5. mattreay

    Associate

    Joined: 9 Mar 2006

    Posts: 53

    Good Point. Thanks for your help