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Wednesday, February 5th, 2025 6:31 PM

Netgear CAX80 Modem reporting Downstream power is poor (10.9dBmV). The recommended level is between -10dBmV to 10dBmV.

I just replaced my Arris moden with the netgear CAX80 and when I enter the modem admin panel and check the connection I get "Modem reporting Downstream power is poor (10.9dBmV). The recommended level is between -10dBmV to 10dBmV."  A comcast tech was at the house about a month ago and said all the wiring to my modem was fine.  I've double checked all of my coax connections to make sure they are in good order and tight.  How can i correct this situation.

Here is the output from the cable diagnostics:

Cable Diagnostic

Status: Poor

Action: 
[Downstream Power Level]
Try these actions (Click the Refresh button after each step):
1) Make sure the coaxial cable is tightly connected.
2) Remove any unnecessary splitters.
3) Replace any required splitters.
4) Contact your service provider for troubleshooting help.

Internet Access: Good

Downstream Status: Poor

    Downstream Power Level: Poor
    Downstream power is poor (10.9dBmV). The recommended level is between -10dBmV to 10dBmV.

    Downstream SNR: Good

Upstream Status:  Good

    Upstream Power Level: Good


Current time: Wed Feb 05 11:38:15 2025

Startup Procedure
Acquire Downstream Channel: 447 MHz   Locked
Connectivity State:          OK       Operational
Boot State:                  OK       Operational
Security:                   Enabled   BPI+


Downstream Bonded Channels
Channel LockedStatus Modulation ChannelID  Frequency        Power       SNR   Correctables Uncorrectables     
      1     Locked     256 QAM     42     447000000 Hz     8.9 dBmV     40.3 dB     0     0
      2     Locked     256 QAM      1     525000000 Hz     9.9 dBmV     40.5 dB     0     0
      3     Locked     256 QAM      2     531000000 Hz     10 dBmV     40.6 dB     0     0
      4     Locked     256 QAM      3     537000000 Hz     10.1 dBmV     40.6 dB     0     0
      5     Locked     256 QAM      4     543000000 Hz     10.1 dBmV     40.5 dB     0     0
      6     Locked     256 QAM      5     549000000 Hz     10 dBmV     40.5 dB     0     0
      7     Locked     256 QAM      6     555000000 Hz     10.1 dBmV     40.4 dB     0     0
      8     Locked     256 QAM      7     561000000 Hz     10.2 dBmV     40.5 dB     0     0
      9     Locked     256 QAM      8     567000000 Hz     10.2 dBmV     40.6 dB     0     0
     10     Locked     256 QAM      9     573000000 Hz     10.2 dBmV     40.5 dB     0     0
     11     Locked     256 QAM     10     579000000 Hz     10.4 dBmV     40.5 dB     0     0
     12     Locked     256 QAM     11     585000000 Hz     10.5 dBmV     40.5 dB     0     0
     13     Locked     256 QAM     12     591000000 Hz     10.5 dBmV     40.5 dB     0     0
     14     Locked     256 QAM     13     597000000 Hz     10.6 dBmV     40.5 dB     0     0
     15     Locked     256 QAM     14     603000000 Hz     10.5 dBmV     40.5 dB     0     0
     16     Locked     256 QAM     15     609000000 Hz     10.6 dBmV     40.5 dB     0     0
     17     Locked     256 QAM     16     615000000 Hz     10.6 dBmV     40.6 dB     0     0
     18     Locked     256 QAM     17     621000000 Hz     10.7 dBmV     40.4 dB     0     0
     19     Locked     256 QAM     18     627000000 Hz     10.7 dBmV     40.5 dB     0     0
     20     Locked     256 QAM     19     633000000 Hz     10.9 dBmV     40.4 dB     0     0
     21     Locked     256 QAM     33     495000000 Hz     9.4 dBmV     40.3 dB     0     0
     22     Locked     256 QAM     34     507000000 Hz     9.6 dBmV     40.3 dB     0     0
     23     Locked     256 QAM     35     513000000 Hz     9.8 dBmV     40.5 dB     0     0
     24     Locked     256 QAM     36     519000000 Hz     9.9 dBmV     40.5 dB     0     0
     25     Locked     256 QAM     38     471000000 Hz     9.5 dBmV     40.5 dB     0     0
     26     Locked     256 QAM     39     477000000 Hz     9.6 dBmV     40.4 dB     0     0
     27     Locked     256 QAM     40     483000000 Hz     9.6 dBmV     40.5 dB     0     0
     28     Locked     256 QAM     41     489000000 Hz     9.6 dBmV     40.3 dB     0     0
     29     Locked     256 QAM     43     453000000 Hz     9.1 dBmV     40.4 dB     0     0
     30     Locked     256 QAM     44     459000000 Hz     9.2 dBmV     40.3 dB     0     0
     31     Locked     256 QAM     45     465000000 Hz     9.3 dBmV     40.4 dB     0     0
     32     Not Locked     Unknown      0     0 Hz     0.0     0.0     0     0


Upstream Bonded Channels
Channel   LockedStatus  ChannelType ChannelID   SymbolRate        Frequency       Power     
      1       Locked       ATDMA      3       5120 Ksym/sec       22800000 Hz       30.5 dBmV
      2       Locked       ATDMA      1       5120 Ksym/sec       35600000 Hz       30.8 dBmV
      3       Locked       ATDMA      2       5120 Ksym/sec       29200000 Hz       30.8 dBmV
      4       Locked       ATDMA      4       5120 Ksym/sec       16400000 Hz       30.3 dBmV
      5       Locked       ATDMA      5       2560 Ksym/sec       40400000 Hz       32.0 dBmV
      6       Not Locked       Unknown      0       0       0       0.0
      7       Not Locked       Unknown      0       0       0       0.0
      8       Not Locked       Unknown      0       0       0       0.0


Downstream OFDM Channels
Channel   LockedStatus  ProfileID  ChannelID    Frequency       Power       SNR/MER    ActiveSubcarrier    Unerror    Correctable   Uncorrectable
      1     Locked     0 ,1 ,2 ,3     37     762000000 Hz     14.18 dBmV     41.5 dB     1108 ~ 2987     276693824     265891131     301
      2     Not Locked     0      0     0 Hz     0 dBmV     0 dB     0 ~ 4095     0     0     0


Upstream OFDMA Channels
Channel   LockedStatus    ProfileID    ChannelID    Frequency       Power
      1     Not Locked     0      0     0 Hz     0 dBmV
      2     Not Locked     0      0     0 Hz     0 dBmV


Event Log
         Time               Priority     Description
Wed Feb  5 09:35:02 2025     Notice     CM-STATUS message sent. Event Type Code: 24; Chan ID: 37; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: 3.;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
Wed Feb  5 09:34:36 2025     Notice     CM-STATUS message sent. Event Type Code: 16; Chan ID: 37; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: 3.;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
Wed Feb  5 02:13:01 2025     Critical     SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
Wed Feb  5 02:13:01 2025     Notice     DS profile assignment change. DS Chan ID: 32; Previous Profile: ; New Profile: 1 2 3.;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
Wed Feb  5 02:13:00 2025     Notice     TLV-11 - unrecognized OID;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
Thu Jan  1 00:00:32 1970     Notice     Honoring MDD; IP provisioning mode = IPv6
Thu Jan  1 00:00:29 1970     Critical     No Ranging Response received - T3 time-out;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
Thu Jan  1 00:00:24 1970     Critical     SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
Thu Jan  1 00:00:47 1970     Critical     No Ranging Response received - T3 time-out;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
Thu Jan  1 00:00:43 1970     Critical     SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
Tue Feb  4 08:53:35 2025     Critical     Resetting the cable modem due to docsDevResetNow
Thu Jan  1 00:00:48 1970     Critical     No Ranging Response received - T3 time-out;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
Thu Jan  1 00:02:40 1970     Critical     SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
Thu Jan  1 00:02:53 1970     Critical     SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;

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8 days ago

 

tomober Thank you so much for utilizng our Forums to contact our Xfinity Support Team. We are here happy to help with the ongoing connection issues you are having and we are here to be of assistance. To get started can you send us a DM with your full name and address?
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