Forum Discussion

higgsboson's avatar
higgsboson
Superfast
4 days ago
Solved

Persistently low speed

 

Despite being on a 1GBit connection, I rarely achieve greater than 500Mb/s, usually less. The link below is to a word document listing the power and SNR levels for the modem (modem mode). I'd appreciate it if one of the Gurus on this forum could cast an eye over the results, some of the pawer levels seem out of spec, but I'm not sure whether my problem is just traffic and/or time of day, or a bad connection.

Thanks

Modem info

  • higgsboson's avatar
    higgsboson
    3 days ago

    Checked all the connections, all OK. Ran Ookla speed test, just for fun, still below 500Mb/s.

    Swapped to router mode, direct connection, and ran the Samknows (Cisco real speed) full test, looks pretty good to me, link to screenshot below.

    Screenshot - Real Speed result

    Then repeated the Ookla test, 940Mb/s, so it seems that there is a problem either with modem mode or my TPlink router or the connection between. Bottom line is the VM connection is good, so the ball's back in my court. Thanks for the advice

8 Replies

    • carl_pearce's avatar
      carl_pearce
      Superstar
      4 days ago

      You'd consider -21.5 (dBmV) 'normal' on the 3.1 downstream channel?

      That and the wide variance of the 3.0 downstream channels power levels isn't looking like a great connection.

    • higgsboson's avatar
      higgsboson
      Superfast
      3 days ago

      Checked all the connections, all OK. Ran Ookla speed test, just for fun, still below 500Mb/s.

      Swapped to router mode, direct connection, and ran the Samknows (Cisco real speed) full test, looks pretty good to me, link to screenshot below.

      Screenshot - Real Speed result

      Then repeated the Ookla test, 940Mb/s, so it seems that there is a problem either with modem mode or my TPlink router or the connection between. Bottom line is the VM connection is good, so the ball's back in my court. Thanks for the advice

  • jpeg1's avatar
    jpeg1
    Alessandro Volta
    4 days ago

    The first thing that leaps up is the wide spread of downstream signal levels, from +4 to - 7.3 dBm.  This is a definite indication of a connection error that requires a technician visit.

    It would just be worth a check that the coax connections are properly secure. 

  • Cardiffman282's avatar
    Cardiffman282
    Wise owl
    4 days ago

    The 3.1 downstream channel is all over the place in terms of power level and post RS errors. Check for local faults on 0800 561 0061. 

  • higgsboson's avatar
    higgsboson
    Superfast
    4 days ago

    Thanks for all the replies. it's appreciated. I'm having an infuriating problem logging in lately, keep getting "Unexpected Error - refresh the page" in an endless loop, so my apologies if I take a while to report back!

    I'll start with disconnecting / reconnecting coax and ethernet first. My understanding was that power levels should be between -3 and 8, hence my query.

  • higgsboson's avatar
    higgsboson
    Superfast
    3 days ago

    Thanks all, switching to router mode cured the problem, (see solution at top of thread). Downstream and upstream stats in router mode look similar to modem mode, so I guess they are OK. Link to Cisco real speed test in router mode below

    Screenshot - Cisco real speed test