Upstream packet loss and jitter
Hey Guys, Non-stop packetloss all day.
Cox is saying everything is okay, I have been graphing/monitoring the loss for months.
What resolutions do we have besides switching ISPs? Are there any ...
Forum Discussion
Are you seeing any T3 or T4 timeout errors in your modem logs? Remember that you need to let the modem run for at least 24 hours without restarting it for this to be a valid test. Same goes for signal levels. If you post signals right after restarting the modem it makes the values look artificially good.
I did not know that. Here are the EVENTS from the modem.
Time Priority Description Sat Jul 03 22:06:41 2021 3 No Ranging Response received - T3 time-out;CM-MAC=d4:04:cd:24:d5:f9;CMTS-MAC=84:8a:8d:33:77:23;CM-QOS=1.1;CM-VER=3.0; Mon Jul 05 03:10:03 2021 5 RCS Partial Service;CM-MAC=d4:04:cd:24:d5:f9;CMTS-MAC=84:8a:8d:33:77:23;CM-QOS=1.1;CM-VER=3.0; Mon Jul 05 09:50:56 2021 3 No Ranging Response received - T3 time-out;CM-MAC=d4:04:cd:24:d5:f9;CMTS-MAC=84:8a:8d:33:77:23;CM-QOS=1.1;CM-VER=3.0; Here are the signals:
Startup Procedure Procedure Status Comment Acquire Downstream Channel Locked Connectivity State OK Operational Boot State OK Operational Configuration File OK Security Enabled BPI+ DOCSIS Network Access Enabled Allowed Downstream Bonded Channels Channel Lock Status Modulation Channel ID Frequency Power SNR Corrected Uncorrectables 1 Locked 256QAM 29 951.00 MHz 8.10 dBmV 40.95 dB 12819 1352 2 Locked 256QAM 1 783.00 MHz 8.80 dBmV 43.38 dB 26956 7046 3 Locked 256QAM 2 789.00 MHz 8.60 dBmV 40.95 dB 25280 5523 4 Locked 256QAM 3 795.00 MHz 8.50 dBmV 43.38 dB 21831 3302 5 Locked 256QAM 4 801.00 MHz 8.50 dBmV 40.95 dB 23300 3851 6 Locked 256QAM 5 807.00 MHz 8.50 dBmV 40.95 dB 24348 3556 7 Locked 256QAM 6 813.00 MHz 8.40 dBmV 43.38 dB 20451 2017 8 Locked 256QAM 7 819.00 MHz 8.30 dBmV 40.95 dB 21948 2482 9 Locked 256QAM 8 825.00 MHz 8.20 dBmV 40.95 dB 23707 3352 10 Locked 256QAM 9 831.00 MHz 8.00 dBmV 40.95 dB 24708 5228 11 Locked 256QAM 10 837.00 MHz 7.90 dBmV 40.95 dB 25357 9086 12 Locked 256QAM 11 843.00 MHz 7.80 dBmV 40.95 dB 22830 4559 13 Locked 256QAM 12 849.00 MHz 8.00 dBmV 40.95 dB 23915 8329 14 Locked 256QAM 13 855.00 MHz 8.00 dBmV 40.95 dB 22229 6904 15 Locked 256QAM 14 861.00 MHz 8.10 dBmV 40.95 dB 19973 2547 16 Locked 256QAM 15 867.00 MHz 8.10 dBmV 40.37 dB 18073 2125 17 Locked 256QAM 16 873.00 MHz 8.10 dBmV 40.95 dB 18765 3912 18 Locked 256QAM 17 879.00 MHz 8.00 dBmV 40.95 dB 16767 1555 19 Locked 256QAM 18 885.00 MHz 8.00 dBmV 40.95 dB 20869 3613 20 Locked 256QAM 19 891.00 MHz 7.90 dBmV 40.95 dB 27591 7020 21 Locked 256QAM 20 897.00 MHz 7.90 dBmV 40.37 dB 24523 10712 22 Locked 256QAM 21 903.00 MHz 7.80 dBmV 40.95 dB 24621 24422 23 Locked 256QAM 22 909.00 MHz 7.80 dBmV 40.95 dB 24325 20907 24 Locked 256QAM 23 915.00 MHz 7.70 dBmV 40.95 dB 23351 26972 25 Locked 256QAM 24 921.00 MHz 7.90 dBmV 41.90 dB 3583 2203 26 Locked 256QAM 25 927.00 MHz 8.10 dBmV 41.90 dB 2492 2662 27 Locked 256QAM 26 933.00 MHz 8.10 dBmV 41.10 dB 2412 2087 28 Locked 256QAM 27 939.00 MHz 8.30 dBmV 40.40 dB 4670 2299 29 Locked 256QAM 28 945.00 MHz 8.30 dBmV 41.90 dB 4841 2459 30 Locked 256QAM 30 957.00 MHz 8.10 dBmV 40.40 dB 10671 2673 31 Locked 256QAM 31 963.00 MHz 7.90 dBmV 41.10 dB 9694 1731 32 Locked 256QAM 32 969.00 MHz 7.70 dBmV 41.10 dB 10160 1905 Upstream Bonded Channels Channel Lock Status US Channel Type Channel ID Symbol Rate Frequency Power 1 Locked ATDMA 3 5120 kSym/s 30.40 MHz 42.25 dBmV 2 Locked ATDMA 4 5120 kSym/s 36.80 MHz 42.25 dBmV 3 Locked ATDMA 2 5120 kSym/s 24.00 MHz 42.25 dBmV 4 Locked ATDMA 1 5120 kSym/s 17.60 MHz 42.00 dBmV Do you normally see uncorrectable counts that high? The only time it's normal to see that level of uncorrectables is after maintenance was done on the line or on the node. Try resetting the modem and see if the uncorrectable count continues to increase. If it does, that's not normal. I think it might be due to maintenance due to the partial service event in your logs from 3 AM.
For comparison, outside of maintenance times, I get a total of about 10 uncorrectables per year (my downstream connection is basically flawless). So it is definitely not normal to see over 75,000 during the course of a day.
Having 2 T3 timeouts in 2 days isn't ideal but it's not frequent enough to definitely point to an upstream noise issue. You'll need to keep gathering information until a pattern becomes evident.
That seems abnormal. I do see some uncorrectables normally. but on a single channel or 2. I will reset and continue to monitor/gather information.
