Dynamic Range Window violation - flaky connection from 2 to 5 PM

[gary78rpm]

Hello.   Since March, between 2 and maybe 5 PM, my cable modem loses connections.  I'm now down to one splitter, from two, and it still happens.  Re-booting the modem brings it back most of the time but then sometimes it drops again.  I was using an Arris when these problems were happening but then switched to a Netgear C7000-100NAS but the problems persist.  Here is a snapshot of today's log.  Is the problem outside or inside of my house and what can be done? 

Time	Priority	Description
2020-9-19, 14:41:31	Warning (5)	Dynamic Range Window violation
2020-9-19, 14:41:12	Critical (3)	Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=b0:b9:8a:8c:d7:08;CMTS-MAC=2c:31:24:61:16:41;CM-QOS=1.1;CM-VER=3.0;
2020-9-19, 14:41:11	Warning (5)	Dynamic Range Window violation
2020-9-19, 14:40:40	Critical (3)	Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=b0:b9:8a:8c:d7:08;CMTS-MAC=2c:31:24:61:16:41;CM-QOS=1.1;CM-VER=3.0;
2020-9-19, 14:40:11	Warning (5)	Dynamic Range Window violation
2020-9-19, 14:40:07	Critical (3)	Unicast Ranging Received Abort Response - Re-initializing MAC;CM-MAC=b0:b9:8a:8c:d7:08;CMTS-MAC=2c:31:24:61:16:41;CM-QOS=1.1;CM-VER=3.0;
2020-9-19, 14:38:15	Warning (5)	Dynamic Range Window violation
2020-9-19, 14:38:15	Critical (3)	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=b0:b9:8a:8c:d7:08;CMTS-MAC=2c:31:24:61:16:41;CM-QOS=1.1;CM-VER=3.0;
2020-9-19, 14:38:11	Warning (5)	Dynamic Range Window violation
2020-9-19, 14:37:00	Critical (3)	Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=b0:b9:8a:8c:d7:08;CMTS-MAC=2c:31:24:61:16:41;CM-QOS=1.1;CM-VER=3.0;
2020-9-19, 14:36:51	Warning (5)	Dynamic Range Window violation
2020-9-19, 14:36:40	Critical (3)	Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=b0:b9:8a:8c:d7:08;CMTS-MAC=2c:31:24:61:16:41;CM-QOS=1.1;CM-VER=3.0;
2020-9-19, 14:36:27	Critical (3)	Unicast Ranging Received Abort Response - Re-initializing MAC;CM-MAC=b0:b9:8a:8c:d7:08;CMTS-MAC=2c:31:24:61:16:41;CM-QOS=1.1;CM-VER=3.0;
2020-9-19, 14:36:11	Warning (5)	Dynamic Range Window violation
2020-9-19, 14:36:07	Critical (3)	Unicast Ranging Received Abort Response - Re-initializing MAC;CM-MAC=b0:b9:8a:8c:d7:08;CMTS-MAC=2c:31:24:61:16:41;CM-QOS=1.1;CM-VER=3.0;
2020-9-19, 14:34:12	Warning (5)	Dynamic Range Window violation
2020-9-19, 14:23:38	Critical (3)	Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=b0:b9:8a:8c:d7:08;CMTS-MAC=2c:31:24:61:16:41;CM-QOS=1.1;CM-VER=3.0;
2020-9-19, 14:23:10	Critical (3)	Unicast Ranging Received Abort Response - Re-initializing MAC;CM-MAC=b0:b9:8a:8c:d7:08;CMTS-MAC=2c:31:24:61:16:41;CM-QOS=1.1;CM-VER=3.0;
2020-9-19, 14:23:07	Warning (5)	Dynamic Range Window violation
2020-9-19, 14:23:05	Critical (3)	Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=b0:b9:8a:8c:d7:08;CMTS-MAC=2c:31:24:61:16:41;CM-QOS=1.1;CM-VER=3.0;
2020-9-19, 14:22:54	Warning (5)	Dynamic Range Window violation
2020-9-19, 14:22:54	Critical (3)	Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=b0:b9:8a:8c:d7:08;CMTS-MAC=2c:31:24:61:16:41;CM-QOS=1.1;CM-VER=3.0;
2020-9-19, 14:22:33	Critical (3)	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=b0:b9:8a:8c:d7:08;CMTS-MAC=2c:31:24:61:16:41;CM-QOS=1.1;CM-VER=3.0;
2020-9-19, 14:22:20	Critical (3)	Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=b0:b9:8a:8c:d7:08;CMTS-MAC=2c:31:24:61:16:41;CM-QOS=1.1;CM-VER=3.0;
2020-9-19, 14:22:12	Warning (5)	Dynamic Range Window violation
2020-9-19, 14:22:05	Critical (3)	Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=b0:b9:8a:8c:d7:08;CMTS-MAC=2c:31:24:61:16:41;CM-QOS=1.1;CM-VER=3.0;
2020-9-19, 14:21:53	Warning (5)	Dynamic Range Window violation
2020-9-19, 14:21:48	Critical (3)	Unicast Ranging Received Abort Response - Re-initializing MAC;CM-MAC=b0:b9:8a:8c:d7:08;CMTS-MAC=2c:31:24:61:16:41;CM-QOS=1.1;CM-VER=3.0;
2020-9-19, 14:21:35	Warning (5)	Dynamic Range Window violation
2020-9-19, 14:21:34	Critical (3)	Unicast Ranging Received Abort Response - Re-initializing MAC;CM-MAC=b0:b9:8a:8c:d7:08;CMTS-MAC=2c:31:24:61:16:41;CM-QOS=1.1;CM-VER=3.0;
2020-9-19, 14:21:33	Warning (5)	Dynamic Range Window violation
2020-9-19, 14:21:33	Critical (3)	Unicast Ranging Received Abort Response - Re-initializing MAC;CM-MAC=b0:b9:8a:8c:d7:08;CMTS-MAC=2c:31:24:61:16:41;CM-QOS=1.1;CM-VER=3.0;
2020-9-19, 14:21:21	Warning (5)	Dynamic Range Window violation
2020-9-19, 14:21:20	Critical (3)	Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=b0:b9:8a:8c:d7:08;CMTS-MAC=2c:31:24:61:16:41;CM-QOS=1.1;CM-VER=3.0;
2020-9-19, 14:21:19	Warning (5)	Dynamic Range Window violation
2020-9-19, 14:21:19	Critical (3)	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=b0:b9:8a:8c:d7:08;CMTS-MAC=2c:31:24:61:16:41;CM-QOS=1.1;CM-VER=3.0;
2020-9-19, 14:21:19	Warning (5)	Dynamic Range Window violation
2020-9-19, 14:21:04	Critical (3)	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=b0:b9:8a:8c:d7:08;CMTS-MAC=2c:31:24:61:16:41;CM-QOS=1.1;CM-VER=3.0;
2020-9-19, 14:21:02	Warning (5)	Dynamic Range Window violation
2020-9-19, 14:20:54	Critical (3)	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=b0:b9:8a:8c:d7:08;CMTS-MAC=2c:31:24:61:16:41;CM-QOS=1.1;CM-VER=3.0;

[EG]

Please also post the *Downstream Power Level*, the *Upstream Power Level*, and the *SNR* (Signal to Noise Ratio) numbers.

[gary78rpm]

Thank you so much for your reply.  Here is what things looked like today when my VPN dropped me.  I didn't lose my Comcast network connection, though, but the Up-bound icon was flashing on the modem while these figures were collected:

Downstream Bonded Channels

Channel Lock Status Modulation Channel ID Frequency Power SNR Correctables Uncorrectables 1 Locked QAM256 33 603000000 Hz 12.2 dBmV 38.4 dB 901881 80 2 Locked QAM256 21 531000000 Hz 11.8 dBmV 38.7 dB 106138 0 3 Locked QAM256 22 537000000 Hz 11.9 dBmV 38.8 dB 119197 0 4 Locked QAM256 23 543000000 Hz 12.4 dBmV 39.1 dB 95094 0 5 Locked QAM256 24 549000000 Hz 12.3 dBmV 39 dB 107625 0 6 Locked QAM256 25 555000000 Hz 12.1 dBmV 38.8 dB 171262 0 7 Locked QAM256 26 561000000 Hz 11.7 dBmV 38.7 dB 253962 0 8 Locked QAM256 27 567000000 Hz 11.4 dBmV 38.6 dB 344648 0 9 Locked QAM256 28 573000000 Hz 11.5 dBmV 38.5 dB 397355 0 10 Locked QAM256 29 579000000 Hz 10.8 dBmV 38.1 dB 879835 18 11 Locked QAM256 30 585000000 Hz 11.3 dBmV 38.1 dB 1177287 0 12 Locked QAM256 31 591000000 Hz 11.5 dBmV 38.2 dB 1148608 0 13 Locked QAM256 32 597000000 Hz 11.4 dBmV 38 dB 1399034 0 14 Locked QAM256 34 609000000 Hz 11.9 dBmV 38.3 dB 1079788 0 15 Locked QAM256 35 615000000 Hz 12.1 dBmV 38.4 dB 1246640 0 16 Locked QAM256 36 621000000 Hz 12.2 dBmV 38.5 dB 1145605 0 17 Locked QAM256 37 627000000 Hz 12.4 dBmV 39.3 dB 59 0 18 Locked QAM256 38 633000000 Hz 12.2 dBmV 39 dB 121 0 19 Locked QAM256 39 639000000 Hz 12.2 dBmV 39 dB 62 0 20 Locked QAM256 40 645000000 Hz 13 dBmV 39.6 dB 44 0 21 Locked QAM256 41 651000000 Hz 12.7 dBmV 39.4 dB 71 0 22 Locked QAM256 42 657000000 Hz 13.7 dBmV 39.8 dB 59 0 23 Locked QAM256 43 663000000 Hz 14.1 dBmV 39.9 dB 35 0 24 Locked QAM256 44 669000000 Hz 13.5 dBmV 39.5 dB 44 0

Upstream Bonded Channels (Partial Service)

Channel Lock Status US Channel Type Channel ID Symbol Rate Frequency Power 1 Not Locked Unknown 1 0 Ksym/sec 35600000 Hz 0.0 dBmV 2 Locked ATDMA 2 5120 Ksym/sec 29200000 Hz 41.3 dBmV 3 Locked ATDMA 3 5120 Ksym/sec 22800000 Hz 39.8 dBmV 4 Locked ATDMA 4 5120 Ksym/sec 16400000 Hz 46.3 dBmV 5 Not Locked Unknown 5 0 Ksym/sec 39600000 Hz 0.0 dBmV 6 Not Locked Unknown 0 0 Ksym/sec 0 Hz 0.0 dBmV 7 Not Locked Unknown 0 0 Ksym/sec 0 Hz 0.0 dBmV 8 Not Locked Unknown 0 0 Ksym/sec 0 Hz 0.0 dBmV

[EG]

The downstream power is on the high side bit I'm not certain that that is the root cause of your issue. There is a good amount of correctable bit errors on many of the downstream channels but that should not be a problem as they have been corrected / neutralized. The uncorrectables are practically non-existent.

There is a greater than 6 dB difference in upstream channels 3 and 4. It should be only 2 to 3 dB. That typically is the cause of this error;

2020-9-19, 14:34:12

Warning (5)

Dynamic Range Window violation

I don't think that you will be able to correct this problem. It may be best to get a tech out to investigate and correct this. Good luck with it !

[gary78rpm]

The Comcast tech that came out said the same thing.  On our 4 house junction box he cut an unused line to my neighbor's house and added two terminators where none had been before.  Then he gave me a splitter to put inside the house to lower the signal.  No problems since!  Thank you for your insights!   Gary

[EG]

Hope things hold up for you. Good luck !