Forum Discussion

B_G_M's avatar
B_G_M
New Contributor II
2 years ago

signal-to-noise ratio

Notice that the signal-to-noise ratio for downstream channel 5 is at " 0 ". Is this an acceptable level? From the information that I have read on the internet, the db should be >30

My reading is posted below:

5 Not Locked Unknown 27 747000000 Hz 0.0 dBmV 0.0 dB 0 0
  • WiderMouthOpen's avatar
    WiderMouthOpen
    2 years ago

    Looks like a problem with that frequency. How do the other channels look around it? Any uncorrectables? I would suggest bypassing all splitters and  doing a factory reset and see if the problem continues. If so, you need a technician.

  • B_G_M's avatar
    B_G_M
    2 years ago

    The complete log is below, belive everything looks good except channel 5:

    Downstream Bonded Channels (Partial Service)
    Channel Lock Status Modulation Channel ID Frequency Power SNR Correctables Uncorrectables
    1 Locked QAM256 21 237000000 Hz 5.7 dBmV 43 dB 967 0
    2 Locked QAM256 5 141000000 Hz 3.8 dBmV 40.2 dB 867 57
    3 Locked QAM256 25 735000000 Hz 4.7 dBmV 40 dB 15 0
    4 Locked QAM256 26 741000000 Hz 4.5 dBmV 39.7 dB 6 0
    5 Not Locked Unknown 27 747000000 Hz 0.0 dBmV 0.0 dB 0 0
    6 Locked QAM256 33 783000000 Hz 5.1 dBmV 41.4 dB 39 0
    7 Locked QAM256 34 789000000 Hz 4.7 dBmV 41.1 dB 49 0
    8 Locked QAM256 37 807000000 Hz 4.4 dBmV 40.9 dB 61 0
    9 Locked QAM256 38 813000000 Hz 4 dBmV 40.6 dB 84 0
    10 Locked QAM256 39 819000000 Hz 4.4 dBmV 40.7 dB 91 0
    11 Locked QAM256 40 825000000 Hz 4.3 dBmV 40.7 dB 86 0
    12 Locked QAM256 41 831000000 Hz 4.2 dBmV 40.6 dB 248 418
    13 Locked QAM256 42 837000000 Hz 4.1 dBmV 40.5 dB 102 0
    14 Locked QAM256 43 843000000 Hz 4.3 dBmV 40.2 dB 116 0
    15 Locked QAM256 44 849000000 Hz 4.4 dBmV 40.6 dB 105 0
    16 Locked QAM256 45 855000000 Hz 4.2 dBmV 40.4 dB 110 0
     
  • WiderMouthOpen's avatar
    WiderMouthOpen
    Esteemed Contributor
    2 years ago

    Looks like a problem with that frequency. How do the other channels look around it? Any uncorrectables? I would suggest bypassing all splitters and  doing a factory reset and see if the problem continues. If so, you need a technician.

    • B_G_M's avatar
      B_G_M
      New Contributor II
      2 years ago

      The complete log is below, belive everything looks good except channel 5:

      Downstream Bonded Channels (Partial Service)
      Channel Lock Status Modulation Channel ID Frequency Power SNR Correctables Uncorrectables
      1 Locked QAM256 21 237000000 Hz 5.7 dBmV 43 dB 967 0
      2 Locked QAM256 5 141000000 Hz 3.8 dBmV 40.2 dB 867 57
      3 Locked QAM256 25 735000000 Hz 4.7 dBmV 40 dB 15 0
      4 Locked QAM256 26 741000000 Hz 4.5 dBmV 39.7 dB 6 0
      5 Not Locked Unknown 27 747000000 Hz 0.0 dBmV 0.0 dB 0 0
      6 Locked QAM256 33 783000000 Hz 5.1 dBmV 41.4 dB 39 0
      7 Locked QAM256 34 789000000 Hz 4.7 dBmV 41.1 dB 49 0
      8 Locked QAM256 37 807000000 Hz 4.4 dBmV 40.9 dB 61 0
      9 Locked QAM256 38 813000000 Hz 4 dBmV 40.6 dB 84 0
      10 Locked QAM256 39 819000000 Hz 4.4 dBmV 40.7 dB 91 0
      11 Locked QAM256 40 825000000 Hz 4.3 dBmV 40.7 dB 86 0
      12 Locked QAM256 41 831000000 Hz 4.2 dBmV 40.6 dB 248 418
      13 Locked QAM256 42 837000000 Hz 4.1 dBmV 40.5 dB 102 0
      14 Locked QAM256 43 843000000 Hz 4.3 dBmV 40.2 dB 116 0
      15 Locked QAM256 44 849000000 Hz 4.4 dBmV 40.6 dB 105 0
      16 Locked QAM256 45 855000000 Hz 4.2 dBmV 40.4 dB 110 0
       
      • WiderMouthOpen's avatar
        WiderMouthOpen
        Esteemed Contributor
        2 years ago

        You are right, looks specific to 747Mhz which seems to be LTE/CDMA. Do you have any splitter to bypass? Doesn't take much for cellular ingress to leak in.