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Sargebear's avatar
Sargebear
Aspirant
Nov 02, 2020

Performance Issues Cox Gigablast - downstream OFDM error rate

I've been experiencing intermittent internet connection issues since upgrading to a Halo mesh router about 1.5 months ago. Things were rought for about the first 1-2 weeks, and then suddenly corrrected itself. It's been three months since then and the errors are back again. Nothing has changed I can think of. 

 

When I look on the Netgear admin page I'm seeing streams of errors but I don't see any informaiton on the nature of the errors. It says they are correctable but no insight into how.

 

Including screenshots.

4 Replies

  • FURRYe38's avatar
    FURRYe38
    Guru - Experienced User
    Nov 02, 2020

    Have the ISP check the signal and line quality UP to the modem. Be sure the ISP provisions the modem correctly.
    Be sure there are no coax cable line splitters in the between the modem and ISP service box. 
    Be sure your using good quality RG6 coax cable up to the modem. 
    Be sure to power OFF the modem for 1 minute them back ON.

    Be sure to test speeds and operation with a wired PC connected directly to the modem with out a external wifi router in the mix...
    https://community.netgear.com/t5/Cable-Modems-Routers/General-info-and-Troubleshooting-for-Cable-Modems/m-p/1530376#M12853

    • Sargebear's avatar
      Sargebear
      Aspirant
      Nov 02, 2020

      I did check with the ISP about the the signal quality and there was no indication of any issue.

       

      I have done a speed test from the router to the modem and from the modem to the internet and both of them are above 900 Mbps. When the network is running well direct from my device the speed rate is excellent (just ran the text now and download speed is 370 Mbps). But then it'll suddenly hit a brick wall - drop to 0.6 Mbps. Sometimes at that point it drops the connection entirely, other times it limps along and then suddenly rejoins at the original join speed.

       

      I did confirm with the cable company and with my electrician that I'm using the primary cable drop in my home - the direct wire from the cable company into the house. There is no splitter on the line. I also don't have any other services from Cox - don't have cable TV or VOIP.

       

      I did check the cable and I guess it depends on what is considered "good" - it's properly terminated at both ends, but I'll check.

       

      I'll also confirm the modem settings with the cable company and ask them to re-test the line.

       

      It's frustrating that the problem is intermittent - don't know (or can't see a pattern) of what prompts it to start and what has changed when it returns to normal. 

      • plemans's avatar
        plemans
        Guru - Experienced User
        Nov 02, 2020

        Your power levels and errors are normal and within the optimal range. 

        Its when you get the uncorrectable errors you really want to worry. 

        whats more important is the logs. The cable connections page are just a snapshot. The logs give us more info. 

         

        Also, when it slows down, what fixes it? rebooting the modem? rebooting the router? 

        How frequently is it slowing down? 

        If its frequently enough, you can hardwire a pc/laptop to the modem directly with no router and ensure the line is stable. 

        does it impact both wired and wireless devices?