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MancSoulja's avatar
MancSoulja
Tuning in
3 days ago

intermittent internet issues after engineer visit.

I've been having issue with my internet for a number of weeks now, I've been a virgin customer for over a decade and this is my first real issue.

Anyway, an engineer visited today and advised us that our signal levels were too low, he moved us up a few levels in our local cabinet and replaced our router with a new one.

The internet lasted for about an hour after the engineer left and since then it's been worse than ever, it just disconnects every 30 mins to an hour and stays disconnected until I power cycle the router.

I've checked the logs and the router is reporting a lot of errors like "DBC-REQ Mismatch Between Calculated Value for P1.6hi Compared to CCAP Provided Value" and "SYNC Timing Synchronization failure - Loss of Sync;" 

Any ideas what I should do?

3 Replies

  • Tudor's avatar
    Tudor
    Very Insightful Person

    Please provide a full set of stats: 

    How to get stats from a VM hub (no need to logon to the hub)

    Open a web browser and go to 192.168.0.1 router mode or 192.168.100.1 modem mode

    • Click on the “> Check router status” button
    • Click on the “Downstream” tab, copy the text and paste into your reply, do not take a screen shot
    • Click on the “Upstream” tab, copy the text and paste into your reply
    • Click on the “Networking” tab, copy the text and paste into your reply.
      • Do NOT post photos or screen shots they will be rejected as they contain MAC addresses. The board software will automatically change MAC addresses to **:** if done as above.
  • Here it is:

    3.0 Downstream channels

    Channel    Frequency (Hz)    Power (dBmV)    SNR (dB)    Modulation    Channel ID
    1    306000000    5.7    41    QAM 256    22
    2    138000000    6.5    40    QAM 256    1
    3    146000000    6.3    40    QAM 256    2
    4    154000000    6    41    QAM 256    3
    5    162000000    5.6    40    QAM 256    4
    6    170000000    5.4    40    QAM 256    5
    7    178000000    5.3    40    QAM 256    6
    8    186000000    5.3    40    QAM 256    7
    9    194000000    5.5    40    QAM 256    8
    10    202000000    5.3    40    QAM 256    9
    11    210000000    5.3    40    QAM 256    10
    12    218000000    5    40    QAM 256    11
    13    226000000    4.8    40    QAM 256    12
    14    234000000    4.7    40    QAM 256    13
    15    242000000    4.8    40    QAM 256    14
    16    250000000    5.2    40    QAM 256    15
    17    258000000    5.3    40    QAM 256    16
    18    266000000    5.1    41    QAM 256    17
    19    274000000    5.2    41    QAM 256    18
    20    282000000    5.3    41    QAM 256    19
    21    290000000    5.7    41    QAM 256    20
    22    298000000    5.7    41    QAM 256    21
    23    314000000    5.5    41    QAM 256    23
    24    322000000    5.4    41    QAM 256    24
    25    330000000    5.2    41    QAM 256    25
    26    338000000    5.4    40    QAM 256    26
    27    346000000    5.6    41    QAM 256    27
    28    354000000    5.9    41    QAM 256    28
    29    362000000    6.2    41    QAM 256    29
    30    370000000    5.9    41    QAM 256    30
    31    378000000    5.5    41    QAM 256    31
    32    386000000    5.1    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    40    0    0
    3    Locked    40    0    0
    4    Locked    41    0    0
    5    Locked    40    0    0
    6    Locked    40    0    0
    7    Locked    40    0    0
    8    Locked    40    0    0
    9    Locked    40    0    0
    10    Locked    40    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    0    0
    18    Locked    41    0    0
    19    Locked    41    0    0
    20    Locked    41    0    0
    21    Locked    41    0    0
    22    Locked    41    0    0
    23    Locked    41    0    0
    24    Locked    41    0    0
    25    Locked    41    0    0
    26    Locked    40    0    0
    27    Locked    41    0    0
    28    Locked    41    0    0
    29    Locked    41    0    0
    30    Locked    41    0    0
    31    Locked    41    0    0
    32    Locked    41    0    0
    3.1 Downstream channels

    Channel    Channel Width (MHz)    FFT Type    Number of Active Subcarriers    Modulation (Active Profile)    First Active Subcarrier (Hz)
    159    94    4K    1840    QAM 4096    1108
    3.1 Downstream channels

    Channel ID    Locked Status    RxMER Data (dB)    PLC Power (dBmV)    Corrected errors (Active Profile)    Uncorrectable errors (Active Profile)

     

    3.0 Upstream channels

    Channel    Frequency (Hz)    Power (dBmV)    Symbol Rate (ksps)    Modulation    Channel ID
    0    49600000    46.3    5120    QAM 64    1
    1    43100000    45.5    5120    QAM 64    2
    2    36600000    44.3    5120    QAM 64    3
    3    30100000    44.3    5120    QAM 64    4
    4    23600000    42.8    5120    QAM 64    5
    3.0 Upstream channels

    Channel    Channel Type    T1 Timeouts    T2 Timeouts    T3 Timeouts    T4 Timeouts
    0    ATDMA    0    0    0    0
    1    ATDMA    0    0    0    0
    2    ATDMA    0    0    0    0
    3    ATDMA    0    0    0    0
    4    ATDMA    0    0    0    0
    3.1 Upstream channels

    Channel    Channel Width (MHz)    Power (dBmV)    FFT Type    Modulation
    6    10    41.2    2K    QAM 256
    3.1 Upstream channels

    Channel    Channel Type    Number of Active Subcarriers    First Active Subcarrier (Hz)    T3 Timeouts    T4 Timeouts
    6    OFDMA    200    74000000    0    0

     

    Network Log

    Time    Priority    Description
    27-08-2025 20:48:51    notice    GUI Login Status - Login Fail from LAN interface
    27-08-2025 19:54:52    notice    CM-STATUS message sent. Event Type Code: 24; Chan ID: 159; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: 3.;CM-MAC=20:35:43:0b:b0:f7;CMTS-MAC=70:e4:22:f1:b1:ce;CM-QOS=1.1;CM-VER=3.1;
    27-08-2025 19:49:55    notice    CM-STATUS message sent. Event Type Code: 22; Chan ID: 159; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=20:35:43:0b:b0:f7;CMTS-MAC=70:e4:22:f1:b1:ce;CM-QOS=1.1;CM-VER=3.1;
    27-08-2025 19:47:31    notice    CM-STATUS message sent. Event Type Code: 16; Chan ID: 159; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: 3.;CM-MAC=20:35:43:0b:b0:f7;CMTS-MAC=70:e4:22:f1:b1:ce;CM-QOS=1.1;CM-VER=3.1;
    27-08-2025 19:47:28    notice    CM-STATUS message sent. Event Type Code: 20; Chan ID: 159; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=20:35:43:0b:b0:f7;CMTS-MAC=70:e4:22:f1:b1:ce;CM-QOS=1.1;CM-VER=3.1;
    27-08-2025 19:47:18    warning    DBC-REQ Mismatch Between Calculated Value for P1.6hi Compared to CCAP Provided Value;CM-MAC=20:35:43:0b:b0:f7;CMTS-MAC=70:e4:22:f1:b1:ce;CM-QOS=1.1;CM-VER=3.1;
    27-08-2025 19:47:18    notice    US profile assignment change. US Chan ID: 6; Previous Profile: 13; New Profile: 11 13.;CM-MAC=20:35:43:0b:b0:f7;CMTS-MAC=70:e4:22:f1:b1:ce;CM-QOS=1.1;CM-VER=3.1;
    27-08-2025 19:47:02    notice    REGISTRATION COMPLETE - Waiting for Operational status
    27-08-2025 19:46:56    warning    RNG-RSP CCAP Commanded Power Exceeds Value Corresponding to the Top of the DRW;CM-MAC=20:35:43:0b:b0:f7;CMTS-MAC=70:e4:22:f1:b1:ce;CM-QOS=1.1;CM-VER=3.1;
    27-08-2025 19:46:56    warning    Dynamic Range Window violation
    27-08-2025 19:46:56    warning    Dynamic Range Window violation
    27-08-2025 19:46:56    warning    RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRW;CM-MAC=20:35:43:0b:b0:f7;CMTS-MAC=70:e4:22:f1:b1:ce;CM-QOS=1.1;CM-VER=3.1;
    27-08-2025 19:46:56    warning    RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRW;CM-MAC=20:35:43:0b:b0:f7;CMTS-MAC=70:e4:22:f1:b1:ce;CM-QOS=1.1;CM-VER=3.1;
    27-08-2025 19:46:56    warning    Dynamic Range Window violation
    27-08-2025 19:46:55    warning    REG-RSP-MP Mismatch Between Calculated Value for P1.6hi Compared to CCAP Provided Value;CM-MAC=20:35:43:0b:b0:f7;CMTS-MAC=70:e4:22:f1:b1:ce;CM-QOS=1.1;CM-VER=3.1;
    27-08-2025 19:46:50    notice    DS profile assignment change. DS Chan ID: 32; Previous Profile: ; New Profile: 1 2 3.;CM-MAC=20:35:43:0b:b0:f7;CMTS-MAC=70:e4:22:f1:b1:ce;CM-QOS=1.1;CM-VER=3.1;
    27-08-2025 19:46:49    notice    TLV-11 - unrecognized OID;CM-MAC=20:35:43:0b:b0:f7;CMTS-MAC=70:e4:22:f1:b1:ce;CM-QOS=1.1;CM-VER=3.1;
    27-08-2025 19:46:42    warning    DHCP WARNING - Non-critical field invalid in response ;CM-MAC=20:35:43:0b:b0:f7;CMTS-MAC=70:e4:22:f1:b1:ce;CM-QOS=1.1;CM-VER=3.1;
    27-08-2025 19:46:39    notice    Honoring MDD; IP provisioning mode = IPv4
    27-08-2025 19:46:28    critical    SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=20:35:43:0b:b0:f7;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
    27-08-2025 19:46:26    critical    Cable Modem Reboot because of - HW or Power-On Reset
    27-08-2025 18:24:16    critical    SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=20:35:43:0b:b0:f7;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
    27-08-2025 18:24:15    critical    Cable Modem Reboot because of - HW or Power-On Reset
    27-08-2025 16:44:02    critical    SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=20:35:43:0b:b0:f7;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
    27-08-2025 16:44:01    critical    Cable Modem Reboot because of - HW or Power-On Reset
    27-08-2025 14:12:00    critical    SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=20:35:43:0b:b0:f7;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
    27-08-2025 14:11:57    critical    No Ranging Response received - T3 time-out;CM-MAC=20:35:43:0b:b0:f7;CMTS-MAC=70:e4:22:f1:b1:ce;CM-QOS=1.1;CM-VER=3.1;
    27-08-2025 14:11:49    critical    SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=20:35:43:0b:b0:f7;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
    27-08-2025 14:11:42    critical    Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=20:35:43:0b:b0:f7;CMTS-MAC=70:e4:22:f1:b1:ce;CM-QOS=1.1;CM-VER=3.1;
    27-08-2025 14:11:31    critical    SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=20:35:43:0b:b0:f7;CMTS-MAC=70:e4:22:f1:b1:ce;CM-QOS=1.1;CM-VER=3.1;
    27-08-2025 14:11:00    critical    SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=20:35:43:0b:b0:f7;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
    27-08-2025 14:10:57    critical    Cable Modem Reboot because of - HW or Power-On Reset
    27-08-2025 13:53:41    critical    SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=20:35:43:0b:b0:f7;CMTS-MAC=70:e4:22:f1:b1:ce;CM-QOS=1.1;CM-VER=3.1;