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lordhung's avatar
lordhung
Aspirant
Jul 10, 2020

CM1100 - 3 Day Old, keeps disconnection with high upstream power, using Spectrum

I think I posted on wrong forum- re posting here:
 
Spectrum Ticket: 33699396
 
 

Just got my modem 3 days ago and set it up.  Had a Spectrum tech come out yesterday and took out extra splitters and checked all my signals.  I don't think it made much a difference.  My upstream power hovers around 51-52 dB so any flucutations to that spikes it over 53 dB and causes a T3 error and disconnect.

 

Almost every Spectrum rep wants to blame my for using my own equipment, even though I had this problem with my old modem and bought this modem to upgrade.  I just had it re-provisioned this morning after a factory reset of the modem and the issue is still happening.

 

My coax is running straight from a grounding box to my outlet, then to a splitter that goes to my HD-DVR box and my modem.  There was am amp there before that the tech took out yesterday; he said it was bad.  However, before the tech visit and after, I did not see a noticable change in upstream power. 

 

Is there anything I can do?  Would exchanging the modem for another CM1100 have any difference?  I'm not sure it would, as when there is connection, the model works great, but the disconnects happen sometimes every minute.

6 Replies

  • FURRYe38's avatar
    FURRYe38
    Guru - Experienced User

    The user of High Power signals on the line are probably one issue. 
    The CM1100 is a solid modem if the signals are set right. The ISP should know this. 

     

  • Modem Status:

    Apply             Cancel    
    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

     

    ProcedureStatusComment
    Acquire Downstream Channel777000000 HzLocked
    Connectivity StateOKOperational
    Boot StateOKOperational
    SecurityEnableBPI+
    IP Provisioning ModeHonor MDDIPv4 only

    ChannelLock StatusModulationChannel IDFrequencyPowerSNR / MERUnerrored CodewordsCorrectable CodewordsUncorrectable Codewords
    1LockedQAM25628777000000 Hz-3.4 dBmV42.0 dB11562486319602806
    2LockedQAM2561615000000 Hz0.2 dBmV43.6 dB11448263047596042
    3LockedQAM2562621000000 Hz0.5 dBmV43.4 dB11448028847555886
    4LockedQAM2563627000000 Hz0.4 dBmV43.8 dB11448490343695681
    5LockedQAM2564633000000 Hz-0.2 dBmV43.5 dB11448886541345424
    6LockedQAM2565639000000 Hz0.0 dBmV43.7 dB11449265940215240
    7LockedQAM2566645000000 Hz0.0 dBmV43.5 dB11449591939175175
    8LockedQAM2567651000000 Hz-0.2 dBmV43.4 dB11449961238515067
    9LockedQAM2568657000000 Hz-0.6 dBmV43.4 dB11450292436544684
    10LockedQAM2569663000000 Hz-0.8 dBmV43.3 dB11450793235054461
    11LockedQAM25610669000000 Hz-0.9 dBmV43.1 dB11451211035174279
    12LockedQAM25611675000000 Hz-1.5 dBmV42.6 dB11451578633044310
    13LockedQAM25612681000000 Hz-2.1 dBmV42.6 dB11451967733174263
    14LockedQAM25613687000000 Hz-1.7 dBmV42.6 dB11452332531294266
    15LockedQAM25614693000000 Hz-1.5 dBmV42.6 dB11452660731814094
    16LockedQAM25615699000000 Hz-1.7 dBmV42.5 dB11453188731573861
    17LockedQAM25616705000000 Hz-1.9 dBmV42.2 dB11453543530724596
    18LockedQAM25617711000000 Hz-1.4 dBmV42.3 dB11454011228023708
    19LockedQAM25618717000000 Hz-0.9 dBmV42.7 dB11454432426553504
    20LockedQAM25619723000000 Hz-1.5 dBmV42.6 dB11454819624973442
    21LockedQAM25620729000000 Hz-1.6 dBmV42.5 dB11455205724643434
    22LockedQAM25621735000000 Hz-1.4 dBmV42.9 dB11455602023453271
    23LockedQAM25622741000000 Hz-1.3 dBmV43.0 dB11456020721263014
    24LockedQAM25623747000000 Hz-1.9 dBmV42.8 dB11456375923962999
    25LockedQAM25624753000000 Hz-2.2 dBmV42.6 dB11456768020273026
    26LockedQAM25625759000000 Hz-1.9 dBmV42.8 dB11457179521312969
    27LockedQAM25626765000000 Hz-2.2 dBmV42.8 dB11457559320622805
    28LockedQAM25627771000000 Hz-2.7 dBmV42.4 dB11457991620062881
    29LockedQAM25629783000000 Hz-2.6 dBmV42.6 dB11460360219112843
    30LockedQAM25630789000000 Hz-2.3 dBmV42.7 dB11458799517192595
    31LockedQAM25631795000000 Hz-2.8 dBmV42.3 dB11459133516892554
    32Not LockedUnknown00 Hz0.0 dBmV0.0 dB000

    <Upstream Bonded Channels (Partial Service)<

    ChannelLock StatusModulationChannel IDFrequencyPower
    1LockedATDMA117600000 Hz51.3 dBmV
    2LockedATDMA224000000 Hz52.8 dBmV
    3LockedATDMA330400000 Hz58.8 dBmV
    4LockedATDMA436800000 Hz53.3 dBmV
    5Not LockedUnknown00 Hz0.0 dBmV
    6Not LockedUnknown00 Hz0.0 dBmV
    7Not LockedUnknown00 Hz0.0 dBmV
    8Not LockedUnknown00 Hz0.0 dBmV

    Downstream OFDM Channels

    ChannelLock StatusModulation / Profile IDChannel IDFrequencyPowerSNR / MERActive Subcarrier Number RangeUnerrored CodewordsCorrectable CodewordsUncorrectable Codewords
    1Locked0, 1, 2, 255159848000000 Hz-3.0 dBmV39.8 dB1108 ~ 298730128183521015473925
    2Not Locked0, 25500 Hz1.9 dBmV0.0 dB0 ~ 4095000

    Upstream OFDMA Channels

    ChannelLock StatusModulation / Profile IDChannel IDFrequencyPower
    1Not LockedUnknown00 Hz0 dBmV
    2Not LockedUnknown00 Hz0 dBmV

     

    • plemans's avatar
      plemans
      Guru - Experienced User

      The 58dbmv would cause issues on the line. 

      Spectrum would need to recheck the line. They fight checking lines. 

      I've actually had to rent one of their modems to prove to them it wasn't the "third party" device and get them to fix a line. Then once its fixed, going back to my own modem. 

      • lordhung's avatar
        lordhung
        Aspirant

        So a tech came today and checked everything from the pole drop to the modem line.  Replaced pole connectors, the tech who came yesreday forgot to crimp a fitting smdh.

         

        However, there is an issue with the modem too.

         

        I still have my old modem so I hooked and rehooked it up to compare the 12 year old SBG6580 and the 3 day old CM1100.

         

        Why is there an extra 2-3 dBmV on the CM1100?  Is this normal or do I have a bad modem?

         

        SBG6580:

        Downstream Bonded Channels
        ChannelLock StatusModulationChannel IDFrequencyPowerSNRCorrectedUncorrectables
        1LockedQAM2561615000000 Hz3.3 dBmV42.0 dB00
        2LockedQAM2562621000000 Hz3.3 dBmV42.5 dB00
        3LockedQAM2563627000000 Hz3.4 dBmV42.0 dB00
        4LockedQAM2564633000000 Hz2.9 dBmV41.9 dB00
        5LockedQAM2565639000000 Hz2.5 dBmV41.9 dB00
        6LockedQAM2566645000000 Hz2.9 dBmV42.0 dB00
        7LockedQAM2567651000000 Hz2.6 dBmV42.0 dB00
        8LockedQAM2568657000000 Hz2.2 dBmV41.4 dB00

         

         
        Upstream Bonded Channels
        ChannelLock StatusUS Channel TypeChannel IDSymbol RateFrequencyPower
        1LockedATDMA25120 Ksym/sec24000000 Hz47.0 dBmV
        2LockedATDMA15120 Ksym/sec17600000 Hz46.2 dBmV
        3LockedATDMA35120 Ksym/sec30400000 Hz47.7 dBmV
        4LockedATDMA45120 Ksym/sec36800000 Hz48.2 dBmV

         

        CM1100:

         

        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

        ProcedureStatusComment
        Acquire Downstream Channel759000000 HzLocked
        Connectivity StateOKOperational
        Boot StateOKOperational
        SecurityEnableBPI+
        IP Provisioning ModeHonor MDDIPv4 only

        Downstream Bonded Channels

        ChannelLock StatusModulationChannel IDFrequencyPowerSNR / MERUnerrored CodewordsCorrectable CodewordsUncorrectable Codewords
        1LockedQAM25625759000000 Hz0.0 dBmV40.5 dB6268337800
        2LockedQAM2561615000000 Hz2.1 dBmV43.3 dB6172461300
        3LockedQAM2562621000000 Hz2.2 dBmV43.3 dB6172786400
        4LockedQAM2563627000000 Hz2.0 dBmV43.2 dB6173161700
        5LockedQAM2564633000000 Hz1.5 dBmV42.9 dB6173474500
        6LockedQAM2565639000000 Hz1.6 dBmV43.1 dB6173655200
        7LockedQAM2566645000000 Hz1.4 dBmV43.0 dB6174190100
        8LockedQAM2567651000000 Hz1.2 dBmV42.7 dB6174604600
        9LockedQAM2568657000000 Hz1.1 dBmV42.7 dB6174929700
        10LockedQAM2569663000000 Hz0.9 dBmV42.4 dB6175285900
        11LockedQAM25610669000000 Hz0.9 dBmV42.4 dB6175632400
        12LockedQAM25611675000000 Hz0.5 dBmV41.6 dB6176162100
        13LockedQAM25612681000000 Hz0.3 dBmV42.0 dB6176477800
        14LockedQAM25613687000000 Hz0.6 dBmV41.6 dB6176853300
        15LockedQAM25614693000000 Hz0.6 dBmV41.0 dB6177303000
        16LockedQAM25615699000000 Hz0.3 dBmV40.6 dB6177669600
        17LockedQAM25616705000000 Hz0.0 dBmV40.1 dB61778387211867
        18LockedQAM25617711000000 Hz0.4 dBmV39.8 dB61783098118494
        19LockedQAM25618717000000 Hz0.7 dBmV40.0 dB6178768500
        20LockedQAM25619723000000 Hz0.1 dBmV40.3 dB6179114800
        21LockedQAM25620729000000 Hz-0.1 dBmV41.3 dB6179442100
        22LockedQAM25621735000000 Hz0.1 dBmV42.2 dB6179830200
        23LockedQAM25622741000000 Hz0.3 dBmV41.6 dB6180255600
        24LockedQAM25623747000000 Hz-0.2 dBmV40.7 dB6180596100
        25LockedQAM25624753000000 Hz-0.3 dBmV40.4 dB6181000910
        26LockedQAM25626765000000 Hz-0.1 dBmV40.6 dB6181354900
        27LockedQAM25627771000000 Hz-0.6 dBmV40.4 dB6181716000
        28LockedQAM25628777000000 Hz-1.3 dBmV40.4 dB6181038737946724
        29LockedQAM25629783000000 Hz-0.5 dBmV40.9 dB6182055422651617
        30LockedQAM25630789000000 Hz-0.2 dBmV40.9 dB6182520400
        31LockedQAM25631795000000 Hz-0.9 dBmV40.6 dB6182780200
        32Not LockedUnknown00 Hz0.0 dBmV0.0 dB000

        Upstream Bonded Channels

        ChannelLock StatusModulationChannel IDFrequencyPower
        1LockedATDMA117600000 Hz49.5 dBmV
        2LockedATDMA224000000 Hz50.5 dBmV
        3LockedATDMA330400000 Hz50.5 dBmV
        4LockedATDMA436800000 Hz51.0 dBmV
        5Not LockedUnknown00 Hz0.0 dBmV
        6Not LockedUnknown00 Hz0.0 dBmV
        7Not LockedUnknown00 Hz0.0 dBmV
        8Not LockedUnknown00 Hz0.0 dBmV

        Downstream OFDM Channels

        ChannelLock StatusModulation / Profile IDChannel IDFrequencyPowerSNR / MERActive Subcarrier Number RangeUnerrored CodewordsCorrectable CodewordsUncorrectable Codewords
        1Locked0, 1, 2, 255159848000000 Hz-1.0 dBmV39.5 dB1108 ~ 29871619675201114236130
        2Not Locked0, 25500 Hz5.5 dBmV0.0 dB0 ~ 4095000

        Upstream OFDMA Channels

        ChannelLock StatusModulation / Profile IDChannel IDFrequencyPower
        1Not LockedUnknown00 Hz0 dBmV
        2Not LockedUnknown00 Hz0 dBmV