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kengasper's avatar
kengasper
New Contributor
12 months ago

Modem Errors - Excess Power & Dynamic Range Window Violation

Over the past week I was having a problem with modem dropping to 90mbps DL. After a reboot it would connect at 900mbps but then 15-20mins later it was back down to 90mbps. While diagnosing this issue modems were swapped with no change. Changing the ethernet cable between modem and router seemed to resolve it. But looking at modem event log I have a bunch of excess power events followed by dynamic range window violations. I'm wondering if I should be concerned and whether I still need a technician to look into things?

Date Time Event ID Event Level Description
02/28/2023 08:52 82000200 3 "No Ranging Response received - T3 time-out;CM-MAC=(redacted);CMTS-MAC=(redacted):ee;CM-QOS=1.1;CM-VER=3.1;"
02/28/2023 08:52 2436694061 5 "Dynamic Range Window violation"
02/28/2023 08:52 82001200 5 "RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRW;CM-MAC=(redacted);CMTS-MAC=(redacted):ee;CM-QOS=1.1;CM-VER=3.1;"
02/28/2023 08:52 2436694061 5 "Dynamic Range Window violation"
02/28/2023 08:52 82001200 5 "RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRW;CM-MAC=(redacted);CMTS-MAC=(redacted):ee;CM-QOS=1.1;CM-VER=3.1;"
02/28/2023 08:52 2436694061 5 "Dynamic Range Window violation"
02/28/2023 08:52 82001200 5 "RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRW;CM-MAC=(redacted);CMTS-MAC=(redacted):ee;CM-QOS=1.1;CM-VER=3.1;"
02/28/2023 08:52 2436694061 5 "Dynamic Range Window violation"
02/28/2023 08:52 82001200 5 "RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRW;CM-MAC=(redacted);CMTS-MAC=(redacted):ee;CM-QOS=1.1;CM-VER=3.1;"
02/28/2023 08:52 2436694061 5 "Dynamic Range Window violation"
02/28/2023 08:52 82001200 5 "RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRW;CM-MAC=(redacted);CMTS-MAC=(redacted):ee;CM-QOS=1.1;CM-VER=3.1;"
02/28/2023 08:52 2436694061 5 "Dynamic Range Window violation"
02/28/2023 08:52 82001200 5 "RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRW;CM-MAC=(redacted);CMTS-MAC=(redacted):ee;CM-QOS=1.1;CM-VER=3.1;"
02/28/2023 08:52 2436694061 5 "Dynamic Range Window violation"
02/28/2023 08:52 82001200 5 "RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRW;CM-MAC=(redacted);CMTS-MAC=(redacted):ee;CM-QOS=1.1;CM-VER=3.1;"
02/28/2023 08:52 82000200 3 "No Ranging Response received - T3 time-out;CM-MAC=(redacted);CMTS-MAC=(redacted):ee;CM-QOS=1.1;CM-VER=3.1;"
02/28/2023 08:52 73050400 5 "REG-RSP-MP Mismatch Between Calculated Value for P1.6hi Compared to CCAP Provided Value;CM-MAC=(redacted);CMTS-MAC=(redacted):ee;CM-QOS=1.1;CM-VER=3.1;"
02/28/2023 08:52 67061600 6 "DS profile assignment change. DS Chan ID: 32; Previous Profile: ; New Profile: 1 2 3.;CM-MAC=(redacted);CMTS-MAC=(redacted):ee;CM-QOS=1.1;CM-VER=3.1;"
02/28/2023 08:52 73040100 6 "TLV-11 - unrecognized OID;CM-MAC=(redacted);CMTS-MAC=(redacted):ee;CM-QOS=1.1;CM-VER=3.1;"
02/28/2023 08:52 68000300 5 "DHCP WARNING - Non-critical field invalid in response ;CM-MAC=(redacted);CMTS-MAC=(redacted):ee;CM-QOS=1.1;CM-VER=3.1;"
01/01/1970 00:00 2436694066 6 "Honoring MDD; IP provisioning mode = IPv4"
01/01/1970 00:00 82000200 3 "No Ranging Response received - T3 time-out;CM-MAC=(redacted);CMTS-MAC=(redacted):ee;CM-QOS=1.1;CM-VER=3.1;"
01/01/1970 00:00 85000200 3 "UCD invalid or channel unusable;CM-MAC=(redacted);CMTS-MAC=(redacted):ee;CM-QOS=1.1;CM-VER=3.1;"
01/01/1970 00:00 84000100 3 "SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=(redacted);CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;"
02/28/2023 08:50 2436694044 3 "Resetting the cable modem due to docsDevResetNow"
02/28/2023 08:50 82000200 3 "No Ranging Response received - T3 time-out;CM-MAC=(redacted);CMTS-MAC=(redacted):ee;CM-QOS=1.1;CM-VER=3.1;"
02/28/2023 08:50 82000200 3 "No Ranging Response received - T3 time-out;CM-MAC=(redacted);CMTS-MAC=(redacted):ee;CM-QOS=1.1;CM-VER=3.1;"
02/28/2023 08:50 82000200 3 "No Ranging Response received - T3 time-out;CM-MAC=(redacted);CMTS-MAC=(redacted):ee;CM-QOS=1.1;CM-VER=3.1;"
01/01/1970 00:00 85000200 3 "UCD invalid or channel unusable;CM-MAC=(redacted);CMTS-MAC=(redacted):ee;CM-QOS=1.1;CM-VER=3.1;"
01/01/1970 00:00 84000100 3 "SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=(redacted);CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;"

22 Replies

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  • WiderMouthOpen's avatar
    WiderMouthOpen
    Esteemed Contributor
    Dynamic Range Window violation

    I think the simplest explanation I have found is this;

    Dynamic Range Window Violation is an issue that occurs when there is a difference in the dBm (decibel milliwatts) values between the uplink and download channels of the network signal.

    If a ranging request is sent from your router and it returns with a 12dBmV difference, it can upset your network connection as this value is greater than the lowest permitted power level for the upstream channel set.

    I don't think they are directly service impacting, but are often followed by T3 errors, which are.

    • kengasper's avatar
      kengasper
      New Contributor

      OK Thanks for that explanation. I do get occasional T3s like this morning there were 2. But prior to today I haven't seen a T3 for 4 days.

    • kengasper's avatar
      kengasper
      New Contributor

      Just rounding back to follow up with Cox to troubleshoot this.

  • WiderMouthOpen's avatar
    WiderMouthOpen
    Esteemed Contributor

    You might want to delete one of your posts since duplicates. Also, can you post your signal levels?

    • kengasper's avatar
      kengasper
      New Contributor

      Sorry. This first post was flagged as spam so I posted a second time with the same results. I'll delete the second one and post power levels.

    • kengasper's avatar
      kengasper
      New Contributor
      Startup Procedure
      Procedure Status Comment
      Acquire Downstream Channel 951000000 Hz Locked
      Connectivity State OK Operational
      Boot State OK Operational
      Configuration File OK
      Security Enabled BPI+
      DOCSIS Network Access Enabled Allowed

      Downstream Bonded Channels
      Channel ID Lock Status Modulation Frequency Power SNR/MER Corrected Uncorrectables
      29 Locked QAM256 951000000 Hz -3.4 dBmV 37.3 dB 9 28
      5 Locked QAM256 807000000 Hz 0.3 dBmV 40.3 dB 0 0
      13 Locked QAM256 855000000 Hz 0.3 dBmV 40.1 dB 0 0
      19 Locked QAM256 891000000 Hz -1.4 dBmV 39.3 dB 0 0
      20 Locked QAM256 897000000 Hz -1.8 dBmV 38.9 dB 0 0
      21 Locked QAM256 903000000 Hz -1.6 dBmV 39.2 dB 0 0
      22 Locked QAM256 909000000 Hz -1.6 dBmV 39.1 dB 0 0
      23 Locked QAM256 915000000 Hz -2.1 dBmV 38.6 dB 0 0
      24 Locked QAM256 921000000 Hz -2.4 dBmV 38.1 dB 0 0
      25 Locked QAM256 927000000 Hz -2.2 dBmV 38.2 dB 0 0
      26 Locked QAM256 933000000 Hz -2.3 dBmV 38.1 dB 0 0
      27 Locked QAM256 939000000 Hz -2.4 dBmV 38.1 dB 0 0
      28 Locked QAM256 945000000 Hz -2.5 dBmV 38.0 dB 0 0
      30 Locked QAM256 957000000 Hz -3.9 dBmV 36.9 dB 0 0
      31 Locked QAM256 963000000 Hz -3.6 dBmV 37.0 dB 0 0
      32 Locked QAM256 969000000 Hz -3.6 dBmV 36.8 dB 0 0
      33 Locked QAM256 357000000 Hz 3.6 dBmV 42.4 dB 22 0
      34 Locked QAM256 363000000 Hz 3.7 dBmV 42.5 dB 19 0
      35 Locked QAM256 369000000 Hz 3.6 dBmV 42.6 dB 21 0
      36 Locked QAM256 375000000 Hz 3.1 dBmV 42.2 dB 7 0
      37 Locked QAM256 381000000 Hz 3.1 dBmV 42.1 dB 15 0
      38 Locked QAM256 387000000 Hz 3.1 dBmV 42.1 dB 27 0
      39 Locked QAM256 393000000 Hz 3.2 dBmV 42.0 dB 37 0
      40 Locked QAM256 399000000 Hz 3.5 dBmV 42.2 dB 39 0
      41 Locked QAM256 405000000 Hz 3.7 dBmV 42.3 dB 45 0
      42 Locked QAM256 411000000 Hz 3.9 dBmV 42.4 dB 38 0
      43 Locked QAM256 417000000 Hz 4.0 dBmV 42.3 dB 11 0
      44 Locked QAM256 423000000 Hz 4.2 dBmV 42.5 dB 33 0
      45 Locked QAM256 429000000 Hz 4.5 dBmV 42.7 dB 5 0
      46 Locked QAM256 435000000 Hz 4.5 dBmV 42.7 dB 6 0
      47 Locked QAM256 441000000 Hz 4.5 dBmV 42.7 dB 8 0
      48 Locked QAM256 447000000 Hz 4.3 dBmV 42.8 dB 6 0
      159 Locked Other 300000000 Hz 2.8 dBmV 40.8 dB 3227116163 584




      Upstream Bonded Channels
      Channel Channel ID Lock Status US Channel Type Frequency Width Power
      1 1 Locked SC-QAM Upstream 17400000 Hz 6400000 Hz 42.0 dBmV
      2 2 Locked SC-QAM Upstream 23900000 Hz 6400000 Hz 42.0 dBmV
      3 3 Locked SC-QAM Upstream 30300000 Hz 6400000 Hz 43.0 dBmV
      4 4 Locked SC-QAM Upstream 36700000 Hz 6400000 Hz 42.0 dBmV
      5 5 Locked SC-QAM Upstream 60000000 Hz 6400000 Hz 43.0 dBmV
      6 6 Locked SC-QAM Upstream 67000000 Hz 6400000 Hz 44.0 dBmV
      7 7 Locked SC-QAM Upstream 74000000 Hz 6400000 Hz 44.0 dBmV
      8 8 Locked SC-QAM Upstream 81000000 Hz 6400000 Hz 45.0 dBmV
    • kengasper's avatar
      kengasper
      New Contributor

      In my other thread... which I can't figure out how to delete... you mentioned...

      "The T3 timeouts are more of a concern. Are you signal levels OK? Specially the upstream. Also, I see a reset signal being sent. Was that you troubleshooting with Cox?"

      I think the levels are good? But when I was troubleshooting the slow speed issue with Cox, I mentioned the Excessive Power events in the event logs to the Cox rep who told me that indicated a problem with my modem and that I needed a new modem. But after getting a new modem I was still have the same problems. That's when I started looking into my speed with a laptop connected directly to the modem and was able to get full speed and lead me to identifying the ethernet cable as the suspected source of my slow speed.

      My speeds have been solid for most of the day now but I'm still wondering based on the logs if I still have any underlying issue to be resolved?

      The reset was from changing modems on my account... I had Cox add my old modem back to the account since the new one isn't needed.

  • kengasper's avatar
    kengasper
    New Contributor

    Got a few of these later in the day...

    Date Time Event ID Event Level Description
    02/28/2023 15:24 2436694061 5 "Dynamic Range Window violation"
    02/28/2023 15:24 82001100 5 "RNG-RSP CCAP Commanded Power Exceeds Value Corresponding to the Top of the DRW;CM-MAC=(redacted);CMTS-MAC=(redacted);CM-QOS=1.1;CM-VER=3.1;"
    02/28/2023 11:06 2436694061 5 "Dynamic Range Window violation"
    02/28/2023 11:06 82001100 5 "RNG-RSP CCAP Commanded Power Exceeds Value Corresponding to the Top of the DRW;CM-MAC=(redacted);CMTS-MAC=(redacted);CM-QOS=1.1;CM-VER=3.1;"

    I'm guessing this means the power levels have increased to now exceeding the top?