Forum Discussion

preston46's avatar
preston46
On our wavelength
13 hours ago

Strange message on my hub 5 logs

I had a problem with my internet connection some time ago, 11 months to be exact, high T3 and T4 timeouts and hub 5 rebooting itself to correct the faults. I had numerous engineers come out, had inside cabling replaced 4 times and exterior cabling checked and replaced twice. I now getting the same fault appear on my virgin media, "intermittent area fault". Last time it was down to someone in my area connecting a faulty piece of equipment, also noticed a new fault fault I've not seen before on the Hub 5 logs.

RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRW;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.1.

I'm on the 1GB service, anyone got any ideas as to what the problem might be this time?

8 Replies

  • gitty's avatar
    gitty
    Joining in
    7 hours ago

    The CMTS maintains a 12 dB dynamic range window. It continually adjusts where the top of the window is to make sure that all the upstream channels lie within it (the power levels).

    At the time of this event, one or more channels were 6 dB or more below this top (half way through the window) - which may have been adjusted a moment after. Unless you have issues, ignore it. Even if there is an issue, this event is not necessarily the reason for it.

  • Nednats's avatar
    Nednats
    Just joined
    8 hours ago


    Thanks for sharing this — your logs look similar to mine, and I’ve also been chasing the cause of the same RNG-RSP CCAP Commanded Power in Excess of 6 dB Below DRW messages. I’ve also had DOCSIS 3.1 channels available, but the modem keeps falling back to 3.0 due to ranging failures.

    Given you've had external cabling replaced twice and the error is still present, that really does suggest this isn’t a cabling issue but more likely a provisioning or CMTS config mismatch, especially if upstream power remains high or unstable.

    If enough of us are seeing the same thing, it may point to a broader config or node-level issue. Let me know if your upstream power is also around 51–52 dBmV?
     

     

  • preston46's avatar
    preston46
    On our wavelength
    8 hours ago

    Keep getting the following message with copy and paste

    Your post contains invalid HTML. Remove the following invalid tags before publishing: div, li-table, li-td, li-tsection, p (data-lang-id)

    • jpeg1's avatar
      jpeg1
      Alessandro Volta
      8 hours ago

      It's another of the apparently unfixable forum bugs. If you copy the text, exit the forum and reenter, then paste the text, that usually fixes it. 

      • preston46's avatar
        preston46
        On our wavelength
        6 hours ago

        3.0 Downstream channels

        Channel    Frequency (Hz)    Power (dBmV)    SNR (dB)    Modulation    Channel ID
        1    306000000    7.4    41    QAM 256    22
        2    146000000    5.3    39    QAM 256    2
        3    154000000    5.4    39    QAM 256    3
        4    162000000    5.5    39    QAM 256    4
        5    170000000    5.4    39    QAM 256    5
        6    178000000    5.5    40    QAM 256    6
        7    186000000    5.6    40    QAM 256    7
        8    194000000    5.8    39    QAM 256    8
        9    202000000    6    40    QAM 256    9
        10    210000000    6.5    39    QAM 256    10
        11    218000000    6.7    40    QAM 256    11
        12    226000000    6.6    40    QAM 256    12
        13    234000000    6.6    40    QAM 256    13
        14    242000000    6.6    40    QAM 256    14
        15    250000000    6.6    40    QAM 256    15
        16    258000000    6.9    40    QAM 256    16
        17    266000000    7    40    QAM 256    17
        18    274000000    7.2    40    QAM 256    18
        19    282000000    7.3    40    QAM 256    19
        20    290000000    7.3    40    QAM 256    20
        21    298000000    7.4    40    QAM 256    21
        22    314000000    7.2    41    QAM 256    23
        23    322000000    7.1    41    QAM 256    24
        24    330000000    7.1    41    QAM 256    25
        25    338000000    7.1    41    QAM 256    26
        26    346000000    7.1    41    QAM 256    27
        27    354000000    7.2    41    QAM 256    28
        28    362000000    7.3    41    QAM 256    29
        29    370000000    7.5    41    QAM 256    30
        30    378000000    7.7    41    QAM 256    31
        31    386000000    7.7    41    QAM 256    32
        3.0 Downstream channels

        Channel    Locked Status    RxMER (dB)    Pre RS Errors    Post RS Errors
        1    Locked    41    0    0
        2    Locked    39    0    0
        3    Locked    39    0    0
        4    Locked    39    8    0
        5    Locked    39    3    0
        6    Locked    40    0    0
        7    Locked    40    0    0
        8    Locked    39    0    0
        9    Locked    40    0    0
        10    Locked    39    0    0
        11    Locked    40    0    0
        12    Locked    40    0    0
        13    Locked    40    0    0
        14    Locked    40    0    0
        15    Locked    40    0    0
        16    Locked    40    0    0
        17    Locked    40    1    0
        18    Locked    40    0    0
        19    Locked    40    0    0
        20    Locked    40    0    0
        21    Locked    40    0    0
        22    Locked    41    0    0
        23    Locked    41    0    0
        24    Locked    41    0    0
        25    Locked    41    1    0
        26    Locked    41    0    0
        27    Locked    41    3    0
        28    Locked    41    0    0
        29    Locked    41    0    0
        30    Locked    41    0    0
        31    Locked    41    2    0
        3.1 Downstream channels

        Channel    Channel Width (MHz)    FFT Type    Number of Active Subcarriers    Modulation (Active Profile)    First Active Subcarrier (Hz)
        33    92    4K    1800    QAM 4096    1128
        3.1 Downstream channels

        Channel ID    Locked Status    RxMER Data (dB)    PLC Power (dBmV)    Corrected errors (Active Profile)    Uncorrectable errors (Active Profile)
        33    Locked    42    7.8    2051136683    206

    • Nednats's avatar
      Nednats
      Just joined
      8 hours ago

      Paste into a text editor first then copy again.

  • jpeg1's avatar
    jpeg1
    Alessandro Volta
    12 hours ago

    Can you copy and paste the Hub upstream and downstream data here?