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Drez_19's avatar
Drez_19
Aspirant
Mar 05, 2019

High Uncorrectables lower channel

Two xfinity calls and 4 new coaxial cables later I'm still having issues with downstream power ramping up and lowest channel uncorrectables. My DS varies from +5 - +9 and the lowest channel is always lower SNR and within hours has 2-4x more uncorrectables than corrected. Is this normal behavior?

Comcast says everything is within specs but earlier my higher channels hit +10 and higher DS power. I ordered some -3 and -6 attenuators but not sure if they will help.

To wrap up is this something that can be fixed by:

1. Adding an attenuator to lower power
2. Changing starting frequency to next channel that seems to be fine
3. Give up and pay for tech visit

Any suggestions welcome
Hardware
Troubleshooting

6 Replies

  • Drez_19's avatar
    Drez_19
    Aspirant
    Mar 06, 2019
    Also forgot to note all the cables I've used are not connected to a splitter and are simple RG6 1.5ft cables from the line to the modem direct.
  • DarrenM's avatar
    DarrenM
    Sr. NETGEAR Moderator
    Mar 07, 2019

    Are you getting T3 and T4 timeouts in the logs of the modem?

     

    DarrenM

    • Drez_19's avatar
      Drez_19
      Aspirant
      Mar 08, 2019
      Thank you for replying. I accidently cleared the logs but since yesterday I did have another one. Previously I've had one every other day.
    • Drez_19's avatar
      Drez_19
      Aspirant
      Mar 09, 2019

      Wanted to post another update in case you're still monitoring, had another T3 error today and my two lowest DS channels continue to have a 4:1 ratio of Uncorrectables to Correctables:

       

      2019-03-08, 18:37:56 Critical (3) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=14:59:c0:5e:cb:a8;CMTS-MAC=00:01:5c:6b:56:67;CM-QOS=1.1;CM-VER=3.0;
      2019-03-06, 23:47:43 Critical (3) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=14:59:c0:5e:cb:a8;CMTS-MAC=00:01:5c:6b:56:67;CM-QOS=1.1;CM-VER=3.0;
      Time Not Established Notice (6) Honoring MDD; IP provisioning mode = IPv6

       

       

      Channel Lock Status Modulation Channel ID Frequency Power SNR Correctables Uncorrectables
      1 Locked QAM256 1 507000000 Hz 6.1 dBmV 37.1 dB 577 2799
      2 Locked QAM256 2 513000000 Hz 5.8 dBmV 40.3 dB 443 2060