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Wed, Jun 3, 2020 4:00 PM

SYNC Timing Synchronization failure

Afternoon all,

 

While it doesn't happen on any consistent basis, when it starts, it drops the internet several times throughout multiple days rendering the internet useless.  I have my own cable modem that is showing the following logs:

 

Time Not Established   Critical (3)   SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=00:40:36:4f:32:8e;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
    Time Not Established   Critical (3)   No Ranging Response received - T3 time-out;CM-MAC=00:40:36:4f:32:8e;CMTS-MAC=00:01:5c:7a:0c:49;CM-QOS=1.1;CM-VER=3.1;
    Time Not Established   Critical (3)   SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=00:40:36:4f:32:8e;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
    Time Not Established   Critical (3)   No Ranging Response received - T3 time-out;CM-MAC=00:40:36:4f:32:8e;CMTS-MAC=00:01:5c:7a:0c:49;CM-QOS=1.1;CM-VER=3.1;

 

My power and signel to noise ratio - Downsteam:

 

   Channel Lock Status Modulation Channel ID Freq. (MHz) Pwr (dBmV) SNR (dB) Corrected Uncorrected
   1 Locked QAM256 13 577.8 9.9 41.4 0 0
   2 Locked QAM256 1 505.8 8.1 40.6 0 0
   3 Locked QAM256 2 511.8 7.8 40.6 0 0
   4 Locked QAM256 3 517.8 7.6 40.7 0 0
   5 Locked QAM256 4 523.8 7.5 40.5 0 0
   6 Locked QAM256 5 529.8 7.5 40.7 0 0
   7 Locked QAM256 6 535.8 7.6 40.6 0 0
   8 Locked QAM256 7 541.8 7.8 41.0 0 0
   9 Locked QAM256 8 547.8 8.2 41.1 0 0
   10 Locked QAM256 9 553.8 8.5 41.1 0 0
   11 Locked QAM256 10 559.8 8.9 41.2 0 0
   12 Locked QAM256 11 565.8 9.4 41.4 0 0
   13 Locked QAM256 12 571.8 9.8 41.4 0 0
   14 Locked QAM256 14 583.8 10.2 41.5 0 0
   15 Locked QAM256 15 589.8 10.3 41.4 0 0
   16 Locked QAM256 16 595.8 10.1 41.3 0 0
   17 Locked QAM256 17 601.8 9.7 40.9 0 0
   18 Locked QAM256 18 607.8 9.5 41.0 0 0
   19 Locked QAM256 19 613.8 9.2 40.9 0 0
   20 Locked QAM256 20 619.8 8.9 40.5 0 0
   21 Locked QAM256 21 625.8 8.8 40.8 0 0
   22 Locked QAM256 22 631.8 8.8 40.9 0 0
   23 Locked QAM256 23 637.8 8.7 40.9 0 0
   24 Locked QAM256 24 643.8 8.9 41.0 0 0
   25 Locked QAM256 25 649.8 9.5 41.0 0 0
   26 Locked QAM256 26 655.8 9.4 41.0 0 0
   27 Locked QAM256 27 661.8 9.9 41.0 0 0
   28 Locked QAM256 28 667.8 10.4 41.1 0 0
   29 Locked OFDM PLC 29 780.0 11.0 38.8 1850031 0
   30 Locked QAM256 30 673.8 10.9 41.0 0 0
   31 Locked QAM256 31 679.8 11.0 41.4 0 0
   32 Locked QAM256 32 685.8 11.1 41.3 0 0

 

Upstream:

Channel Lock Status Channel Type Channel ID Symb. Rate (Ksym/sec) Freq. (MHz) Pwr (dBmV)
   1 Locked SC-QAM 1 5120 36.5 40.8
   2 Locked SC-QAM 2 5120 30.1 40.8
   3 Locked SC-QAM 3 5120 23.7 40.0
   4 Locked SC-QAM 4 5120 17.3 39.5

 

I don't have any spliters on the line - the cable comes from the demarc box outside of the house directly into my modem using a single cable.  Last time I had comcast out, they noted that they couldn't see any issues and because I was running my own modem, there wasn't anything else they could do to help.  I was hoping you all may have some other suggestions for what I could do to keep my internet from dropping.  I'm not adverse to having a tech come out again, I'm just trying to see what else I can do on my end first.

 

Thanks

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