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Forum Discussion
How to read/understand the cable diagnostics on the Nighthawk CAX80.
Hardware Version 1.01 Firmware Version V2.1.5.2 Cable Firmware Version V1.02.08 When the connection on the Nighthawk CAX80 changes from good to poor due to the down...
What Firmware version is currently loaded?
Please post a copy and paste of the modems connection status and event log page.
https://kb.netgear.com/30007/How-do-I-obtain-the-cable-connection-information-from-a-NETGEAR-cable-modem-modem-router
https://kb.netgear.com/30008/How-do-I-view-or-clear-the-event-logs-on-my-NETGEAR-cable-modem-or-modem-router
Power needs to be in between these specs for NG modems and gateways:
https://kb.netgear.com/24311/Power-level-guidelines-for-a-NETGEAR-cable-modem-router
Basements are not recommended places for wifi routers or gateways. Concrete and steel will inhibit good signal travel.
What Firmware version is currently loaded?
Firmware Version V2.1.5.2 Cable Firmware Version V1.02.08 Please post a copy and paste of the modems connection status and event log page. (Including the modem connection status 5/11/2024 for comparison)
Cable ConnectionCancel ApplyCable Diagnostic Status: Good Action: Your setup looks fine. If you are still experience an internet issue, the Netgear Cable Knowledge Base can provide additional troubleshooting info. Internet Access: Downstream Status: Upstream Status: Refresh Save Cable Diagnostic Info Advanced Information Frequency Start Value This field below allows you to modify the frequency the cable modem start with its scan during initialization and registration. Enter the new start frequency and restart the cable modem for it to take effect. Starting Frequency Startup Procedure Procedure Status Comment Acquire Downstream Channel 651 MHz Locked Connectivity State OK Operational Boot State OK Operational Security Enabled BPI+ Downstream Bonded Channels Channel Lock Status Modulation Channel ID Frequency Power SNR Correctables Uncorrectables 1 Locked 256 QAM 44 651000000 Hz 9.1 dBmV 44.5 dB 0 0 2 Locked 256 QAM 13 465000000 Hz 9.7 dBmV 46.0 dB 0 0 3 Locked 256 QAM 14 471000000 Hz 9.7 dBmV 46.0 dB 0 0 4 Locked 256 QAM 15 477000000 Hz 9.9 dBmV 46.0 dB 0 0 5 Locked 256 QAM 16 483000000 Hz 9.8 dBmV 46.0 dB 0 0 6 Locked 256 QAM 17 489000000 Hz 9.7 dBmV 45.9 dB 0 0 7 Locked 256 QAM 18 495000000 Hz 9.7 dBmV 46.0 dB 0 0 8 Locked 256 QAM 19 501000000 Hz 9.7 dBmV 45.8 dB 0 0 9 Locked 256 QAM 20 507000000 Hz 9.6 dBmV 45.8 dB 0 0 10 Locked 256 QAM 21 513000000 Hz 9.4 dBmV 45.7 dB 0 0 11 Locked 256 QAM 22 519000000 Hz 9.4 dBmV 45.7 dB 0 0 12 Locked 256 QAM 23 525000000 Hz 9.4 dBmV 45.7 dB 0 0 13 Locked 256 QAM 24 531000000 Hz 9.2 dBmV 45.6 dB 0 0 14 Locked 256 QAM 25 537000000 Hz 9.1 dBmV 45.5 dB 0 0 15 Locked 256 QAM 26 543000000 Hz 9.0 dBmV 45.4 dB 0 0 16 Locked 256 QAM 27 549000000 Hz 8.9 dBmV 45.4 dB 0 0 17 Locked 256 QAM 28 555000000 Hz 8.8 dBmV 45.3 dB 0 0 18 Locked 256 QAM 29 561000000 Hz 8.7 dBmV 45.2 dB 0 0 19 Locked 256 QAM 30 567000000 Hz 8.7 dBmV 45.2 dB 0 0 20 Locked 256 QAM 31 573000000 Hz 8.6 dBmV 45.1 dB 0 0 21 Locked 256 QAM 32 579000000 Hz 8.6 dBmV 45.1 dB 0 0 22 Locked 256 QAM 33 585000000 Hz 8.6 dBmV 45.0 dB 0 0 23 Locked 256 QAM 34 591000000 Hz 8.8 dBmV 45.1 dB 0 0 24 Locked 256 QAM 35 597000000 Hz 8.8 dBmV 45.1 dB 0 0 25 Locked 256 QAM 36 603000000 Hz 8.8 dBmV 45.0 dB 0 0 26 Locked 256 QAM 37 609000000 Hz 8.8 dBmV 45.0 dB 0 0 27 Locked 256 QAM 38 615000000 Hz 8.9 dBmV 45.1 dB 0 0 28 Locked 256 QAM 39 621000000 Hz 9.0 dBmV 45.0 dB 0 0 29 Locked 256 QAM 40 627000000 Hz 8.9 dBmV 45.0 dB 0 0 30 Locked 256 QAM 41 633000000 Hz 8.9 dBmV 44.9 dB 0 0 31 Locked 256 QAM 42 639000000 Hz 9.2 dBmV 45.0 dB 0 0 32 Locked 256 QAM 43 645000000 Hz 9.0 dBmV 45.0 dB 0 0 Upstream Bonded Channels Channel Lock Status US Channel Type Channel ID Symbol Rate Frequency Power 1 Locked ATDMA 18 5120 Ksym/sec 22800000 Hz 33.0 dBmV 2 Locked ATDMA 17 5120 Ksym/sec 16400000 Hz 33.0 dBmV 3 Locked ATDMA 19 5120 Ksym/sec 29200000 Hz 32.8 dBmV 4 Locked ATDMA 20 5120 Ksym/sec 35600000 Hz 32.8 dBmV 5 Not Locked Unknown 0 0 0 0.0 dBmV 6 Not Locked Unknown 0 0 0 0.0 dBmV 7 Not Locked Unknown 0 0 0 0.0 dBmV 8 Not Locked Unknown 0 0 0 0.0 dBmV Downstream OFDM Channels Channel Lock
StatusModulation /
Profile IDChannel
IDFrequency Power SNR /
MERActive Subcarrier
Number RangeUnerrored
CodewordsCorrectable
CodewordsUncorrectable
Codewords1 Locked 0 ,1 ,2 ,3 193 690000000 Hz 9.58 dBmV 44.6 dB 508 ~ 3587 409167368 161578650 0 2 Locked 0 ,1 ,2 ,3 194 957000000 Hz 3.88 dBmV 42.4 dB 148 ~ 3947 409410584 191372405 0 Upstream OFDMA Channels Channel Lock Status Modulation / Profile ID Channel ID Frequency Power 1 Not Locked 0 0 0 Hz 0 dBmV 2 Not Locked 0 0 0 Hz 0 dBmV Extended Upstream Transmit Power Enable Extended Upstream Transmit Power Current System Time:Sun May 12 15:35:30 2024 System Up Time:19:43:55 Power levels are too high. I'd get a -6dbm cable coax line attenuator in between the modem and ISP cable line.
Any Criticals, Errors or Warnings seen in the event logs needs to be reviewed and resolved by the ISP. Indicates a signal issue on the ISP line up to the modem. Have the ISP check the signal and line quality UP to the modem. Be sure the ISP provisions the modem correctly.
Power levels are too high. I'd get a -6dbm cable coax line attenuator in between the modem and ISP cable line.
Ok - got order the -3db but can return it. Xfinity tech was already here yesterday, and he stated there was nothing wrong with my line/feed coming from the box to my condo unit.
Any Criticals, Errors or Warnings seen in the event logs needs to be reviewed and resolved by the ISP. Indicates a signal issue on the ISP line up to the modem. Have the ISP check the signal and line quality UP to the modem. Be sure the ISP provisions the modem correctly.
As for the event log, do I open another ticket with support? Xfinity tech has told me there is no issues so how do I fight this? I can open a ticket and send them the logs but not sure if that will help.
As I stated before, I find it odd that with the Vizio tv turned off, the signal has been great all day. I have been doing spots checks all day. Just wondering if there could be an issue with the board on the tv causing issues on the line.
Thank You for looking at the logs, greatly appreciate it.
- Event Log
Clear Log Refresh Time Priority Description Sun May 12 05:29:51 2024 Critical (3) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=94:18:65:a6:1f:63;CMTS-MAC=00:90:f0:63:04:00;CM-QOS=1.1;CM-VER=3.1; Sun May 12 03:48:07 2024 Notice (6) CM-STATUS message sent. Event Type Code: 24; Chan ID: 193; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: 1 2.;CM-MAC=94:18:65:a6:1f:63;CMTS-MAC=00:90:f0:63:04:00;CM-QOS=1.1;CM-VER=3.1; Sun May 12 03:43:20 2024 Notice (6) CM-STATUS message sent. Event Type Code: 16; Chan ID: 193; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: 1.;CM-MAC=94:18:65:a6:1f:63;CMTS-MAC=00:90:f0:63:04:00;CM-QOS=1.1;CM-VER=3.1; Sun May 12 02:45:36 2024 Critical (3) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=94:18:65:a6:1f:63;CMTS-MAC=00:90:f0:63:04:00;CM-QOS=1.1;CM-VER=3.1; Sun May 12 01:13:00 2024 Notice (6) CM-STATUS message sent. Event Type Code: 24; Chan ID: 193; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: 1 2.;CM-MAC=94:18:65:a6:1f:63;CMTS-MAC=00:90:f0:63:04:00;CM-QOS=1.1;CM-VER=3.1; Sun May 12 01:10:07 2024 Notice (6) CM-STATUS message sent. Event Type Code: 16; Chan ID: 193; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: 1 2.;CM-MAC=94:18:65:a6:1f:63;CMTS-MAC=00:90:f0:63:04:00;CM-QOS=1.1;CM-VER=3.1; Sun May 12 01:09:59 2024 Notice (6) CM-STATUS message sent. Event Type Code: 16; Chan ID: 193; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: 2.;CM-MAC=94:18:65:a6:1f:63;CMTS-MAC=00:90:f0:63:04:00;CM-QOS=1.1;CM-VER=3.1; Sun May 12 01:09:12 2024 Notice (6) CM-STATUS message sent. Event Type Code: 16; Chan ID: 193; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: 1.;CM-MAC=94:18:65:a6:1f:63;CMTS-MAC=00:90:f0:63:04:00;CM-QOS=1.1;CM-VER=3.1; Sat May 11 22:58:28 2024 Critical (3) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=94:18:65:a6:1f:63;CMTS-MAC=00:90:f0:63:04:00;CM-QOS=1.1;CM-VER=3.1; Sat May 11 22:35:43 2024 Notice (6) CM-STATUS message sent. Event Type Code: 4; Chan ID: 193 194; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=94:18:65:a6:1f:63;CMTS-MAC=00:90:f0:63:04:00;CM-QOS=1.1;CM-VER=3.1; Sat May 11 22:35:16 2024 Warning (5) MDD message timeout;CM-MAC=94:18:65:a6:1f:63;CMTS-MAC=00:90:f0:63:04:00;CM-QOS=1.1;CM-VER=3.1; Sat May 11 20:30:59 2024 Critical (3) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=94:18:65:a6:1f:63;CMTS-MAC=00:90:f0:63:04:00;CM-QOS=1.1;CM-VER=3.1; Sat May 11 19:53:02 2024 Critical (3) UCD invalid or channel unusable;CM-MAC=94:18:65:a6:1f:63;CMTS-MAC=00:90:f0:63:04:00;CM-QOS=1.1;CM-VER=3.1; Sat May 11 19:53:00 2024 Notice (6) DS profile assignment change. DS Chan ID: 33; Previous Profile: ; New Profile: 1 2 3.;CM-MAC=94:18:65:a6:1f:63;CMTS-MAC=00:90:f0:63:04:00;CM-QOS=1.1;CM-VER=3.1; Sat May 11 19:52:59 2024 Notice (6) DS profile assignment change. DS Chan ID: 32; Previous Profile: ; New Profile: 1 2 3.;CM-MAC=94:18:65:a6:1f:63;CMTS-MAC=00:90:f0:63:04:00;CM-QOS=1.1;CM-VER=3.1; Sat May 11 19:52:34 2024 Notice (6) TLV-11 - unrecognized OID;CM-MAC=94:18:65:a6:1f:63;CMTS-MAC=00:90:f0:63:04:00;CM-QOS=1.1;CM-VER=3.1; Thu Jan 1 00:00:51 1970 Notice (6) Honoring MDD; IP provisioning mode = IPv6 Thu Jan 1 00:00:45 1970 Critical (3) UCD invalid or channel unusable;CM-MAC=94:18:65:a6:1f:63;CMTS-MAC=00:90:f0:63:04:00;CM-QOS=1.1;CM-VER=3.1; Thu Jan 1 00:00:43 1970 Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=94:18:65:a6:1f:63;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1; Sat May 11 16:26:17 2024 Critical (3) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=94:18:65:a6:1f:63;CMTS-MAC=00:90:f0:63:04:00;CM-QOS=1.1;CM-VER=3.1; Sat May 11 15:14:12 2024 Critical (3) UCD invalid or channel unusable;CM-MAC=94:18:65:a6:1f:63;CMTS-MAC=00:90:f0:63:04:00;CM-QOS=1.1;CM-VER=3.1; Thu Jan 1 00:00:46 1970 Critical (3) UCD invalid or channel unusable;CM-MAC=94:18:65:a6:1f:63;CMTS-MAC=00:90:f0:63:04:00;CM-QOS=1.1;CM-VER=3.1; Thu Jan 1 00:00:43 1970 Critical (3) SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=94:18:65:a6:1f:63;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;