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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;"
WiderMouthOpen
Esteemed Contributor III
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3.5K Messages
3 years ago
You might want to delete one of your posts since duplicates. Also, can you post your signal levels?
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kengasper
New Contributor
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11 Messages
3 years ago
Got a few of these later in the day...
I'm guessing this means the power levels have increased to now exceeding the top?
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WiderMouthOpen
Esteemed Contributor III
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3.5K Messages
3 years ago
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.
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DesertBlossom
New Contributor II
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7 Messages
2 years ago
Have you gotten anywhere with this?
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