Someone, I think it was WiderMouthOpen, mentioned in another thread the possibility of upstream noise and the problems tracking down. I have now noticed that upstream power seems to go from ~46dB to 57dB when having problems. That is a more than a 10 fold increase in output power. That would seem to imply the head end is having noise/RX problems listening to customers.
Over the weekend I wrote a quick script to ping various devices and collect stats. I was away from home this afternoon, but the connection dropped repeatedly between 11:00am and 2:30pm today. A quick scan of the logs shows 30 drops in that time frame, between 1 and 20 seconds long each. Example drop:
Date Time Router Modem CoxGW Google Server TX RX
20211101 11:12:09 0.335ms 0.825ms 5.26ms 28.5ms 26.6ms 3Kbs 12Kbs
20211101 11:12:10 0.298ms 0.702ms 7.15ms 25.6ms 24.8ms 3Kbs 8Kbs
20211101 11:12:11 0.364ms 0.811ms 5.85ms 24.1ms 22.4ms 3Kbs 11Kbs
20211101 11:12:12 0.326ms 0.850ms 5.84ms 26.1ms 26.3ms 3Kbs 12Kbs
20211101 11:12:13 0.340ms 0.792ms 5.34ms 23.8ms 23.2ms 3Kbs 10Kbs
20211101 11:12:14 0.332ms 0.805ms 6.46ms 25.7ms 23.8ms 4Kbs 19Kbs
20211101 11:12:15 0.344ms 0.789ms ---ms ---ms ---ms 3Kbs 9Kbs
20211101 11:12:16 0.246ms 0.797ms ---ms ---ms ---ms 3Kbs 8Kbs
20211101 11:12:17 0.360ms 0.792ms ---ms ---ms ---ms 5Kbs 21Kbs
20211101 11:12:18 0.349ms 0.766ms ---ms ---ms ---ms 3Kbs 7Kbs
20211101 11:12:19 0.325ms 0.953ms ---ms ---ms ---ms 3Kbs 8Kbs
20211101 11:12:20 0.339ms 0.803ms ---ms ---ms ---ms 3Kbs 7Kbs
20211101 11:12:21 0.341ms 0.804ms ---ms ---ms ---ms 3Kbs 7Kbs
20211101 11:12:22 0.269ms 0.780ms ---ms ---ms ---ms 3Kbs 8Kbs
20211101 11:12:23 0.290ms 0.796ms ---ms ---ms ---ms 5Kbs 10Kbs
20211101 11:12:24 0.248ms 0.800ms ---ms ---ms ---ms 7Kbs 12Kbs
20211101 11:12:25 0.282ms 0.788ms ---ms ---ms ---ms 7Kbs 9Kbs
20211101 11:12:26 0.259ms 0.849ms ---ms ---ms ---ms 5Kbs 7Kbs
20211101 11:12:27 0.333ms 0.812ms ---ms ---ms ---ms 5Kbs 9Kbs
20211101 11:12:28 0.337ms 0.788ms ---ms ---ms ---ms 3Kbs 8Kbs
20211101 11:12:29 0.335ms 0.832ms ---ms ---ms ---ms 4Kbs 8Kbs
20211101 11:12:30 0.336ms 0.810ms ---ms ---ms ---ms 3Kbs 8Kbs
20211101 11:12:31 0.273ms 0.800ms ---ms ---ms ---ms 3Kbs 10Kbs
20211101 11:12:32 0.333ms 0.826ms ---ms ---ms ---ms 6Kbs 13Kbs
20211101 11:12:33 0.294ms 0.872ms ---ms ---ms ---ms 3Kbs 6Kbs
20211101 11:12:34 0.346ms 0.838ms ---ms ---ms ---ms 5Kbs 14Kbs
20211101 11:12:35 0.347ms 0.833ms 13.1ms 28.5ms 27.6ms 3Kbs 10Kbs
20211101 11:12:36 0.315ms 0.770ms 5.77ms 24.1ms 21.7ms 31Kbs 42Kbs
20211101 11:12:37 0.370ms 0.847ms 7.02ms 25.7ms 24.7ms 3Kbs 7Kbs
20211101 11:12:38 0.330ms 0.647ms 5.51ms 24.0ms 22.2ms 3Kbs 15Kbs
In this case I am simultaneously pinging 5 targets: my router, my Cox modem, the Cox gateway, Google 8.8.8, and my personal server in a Colo facility, plus collecting TX and RX rates in/out every second. Note I was not home, so the TX/RX are purely the ping script running and broadcast traffic received from the cable network. As can be seen above, all response beyond my modem stops, my TX rate remains constant, and my RX rate drops a few Kb/s (missing my ping responses, still seeing broadcast traffic).
