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

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=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];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=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];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=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];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=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];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=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];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=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];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=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];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=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];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=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];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=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];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=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];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=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];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=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];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=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];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=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];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=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];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=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];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=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];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=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];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=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];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=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];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=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.0;

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Responses

EG

Expert

•

111.8K Messages

5 years ago

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

gary78rpm

Regular Visitor

•

3 Messages

5 years ago

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

Expert

•

111.8K Messages

5 years ago

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

Regular Visitor

•

3 Messages

5 years ago

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

Your Home Network

gary78rpm

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

EG

gary78rpm

EG

gary78rpm

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