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cynicalbliss
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Thursday, March 31st, 2022 1:03 AM

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Router reports low downstream power

My router (Netgear Nighthawk CAX80)'s diagnostic is reporting that my downstream connection's power level is poor (13.8 dBmV with the recommended range being under -10 to 10). Speed test from the router itself only clocks about half the bandwidth I'm paying for. I've tracked the cabling from my router, to the wall, to where the cable comes in from the telephone pole and there are no splitters being used along the way (only extenders). Is there anything else I can do from my end to fix this? Not seeing anything on Xfinity's automated support.

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3 years ago

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EG

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110K Messages

3 years ago

It's not too low. It's actually too high. Is there an amplifier on the coax cable line leading to the modem. If so, try removing it and see. If not, you can try using a minus -6 dB attenuator pad like this to knock that downstream power level down;

https://www.amazon.com/6db-Attenuator-Pad-1-each/dp/B0013L48XA 

There's no guarantee that this is the root cause of the speed issue, something else may be going on, but this should be addressed regardless,

(edited)

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EG

Expert

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110K Messages

3 years ago

Please copy all of the text in its entirety of the *Downstream Power Levels*, the *SNR's* (Signal to Noise Ratios), and the *Upstream Power Level* numbers and paste them into your next post.

Is this a WiFi connection ?

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cynicalbliss

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From my router's diagnostic:

Downstream Status: Poor

    Downstream Power Level: Poor
    Downstream power is poor (14.2dBmV). The recommended level is between -10dBmV to 10dBmV.

    Downstream SNR: Good

Upstream Status:  Good

    Upstream Power Level: Good


Current time: Thu Mar 31 06:35:51 2022

Startup Procedure
Acquire Downstream Channel: 579 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     13     579000000 Hz     13.1 dBmV     41.9 dB     0     0
      2     Locked     256 QAM      1     489000000 Hz     11.6 dBmV     41.3 dB     0     0
      3     Locked     256 QAM      2     513000000 Hz     12.2 dBmV     41.6 dB     0     0
      4     Locked     256 QAM      3     519000000 Hz     12.3 dBmV     41.9 dB     0     0
      5     Locked     256 QAM      4     525000000 Hz     12.4 dBmV     41.7 dB     0     0
      6     Locked     256 QAM      5     531000000 Hz     12.4 dBmV     41.8 dB     0     0
      7     Locked     256 QAM      6     537000000 Hz     12.4 dBmV     41.9 dB     0     0
      8     Locked     256 QAM      7     543000000 Hz     12.4 dBmV     42 dB     0     0
      9     Locked     256 QAM      8     549000000 Hz     12.5 dBmV     42 dB     0     0
     10     Locked     256 QAM      9     555000000 Hz     12.6 dBmV     42 dB     0     0
     11     Locked     256 QAM     10     561000000 Hz     12.8 dBmV     42.1 dB     0     0
     12     Locked     256 QAM     11     567000000 Hz     12.8 dBmV     41.9 dB     0     0
     13     Locked     256 QAM     12     573000000 Hz     13 dBmV     42 dB     0     0
     14     Locked     256 QAM     14     585000000 Hz     13.2 dBmV     42.1 dB     0     0
     15     Locked     256 QAM     15     591000000 Hz     13.3 dBmV     42.1 dB     0     0
     16     Locked     256 QAM     16     597000000 Hz     13.6 dBmV     42.1 dB     0     0
     17     Locked     256 QAM     17     603000000 Hz     13.5 dBmV     41.9 dB     0     0
     18     Locked     256 QAM     18     609000000 Hz     13.6 dBmV     42 dB     0     0
     19     Locked     256 QAM     19     615000000 Hz     13.4 dBmV     41.8 dB     0     0
     20     Locked     256 QAM     20     621000000 Hz     13.2 dBmV     41.6 dB     0     0
     21     Locked     256 QAM     21     627000000 Hz     13.4 dBmV     41.4 dB     0     0
     22     Locked     256 QAM     22     633000000 Hz     13.9 dBmV     41.6 dB     0     0
     23     Locked     256 QAM     23     639000000 Hz     14 dBmV     41.6 dB     0     0
     24     Locked     256 QAM     24     645000000 Hz     14.1 dBmV     41.6 dB     0     0
     25     Locked     256 QAM     25     651000000 Hz     14.2 dBmV     41.6 dB     0     0
     26     Locked     256 QAM     26     657000000 Hz     14.1 dBmV     41.5 dB     0     0
     27     Locked     256 QAM     27     663000000 Hz     13.9 dBmV     41.5 dB     0     0
     28     Locked     256 QAM     28     669000000 Hz     13.7 dBmV     41.4 dB     0     0
     29     Locked     256 QAM     29     675000000 Hz     13.8 dBmV     40.9 dB     0     0
     30     Locked     256 QAM     30     681000000 Hz     13.4 dBmV     41.3 dB     0     0
     31     Locked     256 QAM     31     687000000 Hz     13.6 dBmV     41.3 dB     0     0
     32     Locked     256 QAM     32     693000000 Hz     13 dBmV     41.1 dB     0     0


Upstream Bonded Channels
Channel   LockedStatus  ChannelType ChannelID   SymbolRate        Frequency       Power     
      1       Locked       ATDMA      1       2560 Ksym/sec       10400000 Hz       41.3 dBmV
      2       Locked       ATDMA      2       5120 Ksym/sec       16400000 Hz       37.3 dBmV
      3       Locked       ATDMA      3       5120 Ksym/sec       22800000 Hz       37.3 dBmV
      4       Locked       ATDMA      4       5120 Ksym/sec       29200000 Hz       37.8 dBmV
      5       Locked       ATDMA      5       5120 Ksym/sec       35600000 Hz       37.8 dBmV
      6       Locked       ATDMA      6       2560 Ksym/sec       40400000 Hz       39.8 dBmV
      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     159     805000000 Hz     11.18 dBmV     40.7 dB     1126 ~ 2969     1396334894     87901395     0
      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

3 years ago

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