Connectivity / T3 Errors

[samalluck]

Hello,

My cable modem appears to be dropping connection quite regularly.  Can I get some help tracking down the issue?

Date Time Event ID Event Level Description

08/15/2020 21:14	67061600	6	"DS profile assignment change. DS Chan ID: 32; Previous Profile: ; New Profile: 1 2 3.;CM-MAC=8c:61:a3:c9:a3:05;CMTS-MAC=00:01:5c:6e:2c:73;CM-QOS=1.1;CM-VER=3.1;"
01/01/1970 00:00	2436694066	6	"Honoring MDD; IP provisioning mode = IPv6"
01/01/1970 00:00	82000200	3	"No Ranging Response received - T3 time-out;CM-MAC=8c:61:a3:c9:a3:05;CMTS-MAC=00:01:5c:6e:2c:73;CM-QOS=1.1;CM-VER=3.1;"
01/01/1970 00:00	84000100	3	"SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=8c:61:a3:c9:a3:05;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;"
08/15/2020 21:12	2436694044	3	"Resetting the cable modem due to docsDevResetNow"
08/15/2020 21:09	82000500	3	"Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=8c:61:a3:c9:a3:05;CMTS-MAC=00:01:5c:6e:2c:73;CM-QOS=1.1;CM-VER=3.1;"
01/01/1970 00:00	84000100	3	"SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=8c:61:a3:c9:a3:05;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;"
08/15/2020 19:59	82000200	3	"No Ranging Response received - T3 time-out;CM-MAC=8c:61:a3:c9:a3:05;CMTS-MAC=00:01:5c:6e:2c:73;CM-QOS=1.1;CM-VER=3.1;"
08/15/2020 19:58	82000400	3	"Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=8c:61:a3:c9:a3:05;CMTS-MAC=00:01:5c:6e:2c:73;CM-QOS=1.1;CM-VER=3.1;"
08/15/2020 19:58	82000200	3	"No Ranging Response received - T3 time-out;CM-MAC=8c:61:a3:c9:a3:05;CMTS-MAC=00:01:5c:6e:2c:73;CM-QOS=1.1;CM-VER=3.1;"
08/15/2020 19:58	82000400	3	"Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=8c:61:a3:c9:a3:05;CMTS-MAC=00:01:5c:6e:2c:73;CM-QOS=1.1;CM-VER=3.1;"
08/15/2020 19:58	82000200	3	"No Ranging Response received - T3 time-out;CM-MAC=8c:61:a3:c9:a3:05;CMTS-MAC=00:01:5c:6e:2c:73;CM-QOS=1.1;CM-VER=3.1;"
08/15/2020 19:58	82000400	3	"Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=8c:61:a3:c9:a3:05;CMTS-MAC=00:01:5c:6e:2c:73;CM-QOS=1.1;CM-VER=3.1;"
08/15/2020 19:58	82000200	3	"No Ranging Response received - T3 time-out;CM-MAC=8c:61:a3:c9:a3:05;CMTS-MAC=00:01:5c:6e:2c:73;CM-QOS=1.1;CM-VER=3.1;"
08/15/2020 19:58	82000400	3	"Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=8c:61:a3:c9:a3:05;CMTS-MAC=00:01:5c:6e:2c:73;CM-QOS=1.1;CM-VER=3.1;"
08/15/2020 19:54	82000500	3	"Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=8c:61:a3:c9:a3:05;CMTS-MAC=00:01:5c:6e:2c:73;CM-QOS=1.1;CM-VER=3.1;"
08/15/2020 19:03	82000500	3	"Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=8c:61:a3:c9:a3:05;CMTS-MAC=00:01:5c:6e:2c:73;CM-QOS=1.1;CM-VER=3.1;"
08/15/2020 17:35	82000500	3	"Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=8c:61:a3:c9:a3:05;CMTS-MAC=00:01:5c:6e:2c:73;CM-QOS=1.1;CM-VER=3.1;"
08/15/2020 17:26	82000500	3	"Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=8c:61:a3:c9:a3:05;CMTS-MAC=00:01:5c:6e:2c:73;CM-QOS=1.1;CM-VER=3.1;"
08/15/2020 16:42	82000500	3	"Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=8c:61:a3:c9:a3:05;CMTS-MAC=00:01:5c:6e:2c:73;CM-QOS=1.1;CM-VER=3.1;"
08/15/2020 16:11	82000200	3	"No Ranging Response received - T3 time-out;CM-MAC=8c:61:a3:c9:a3:05;CMTS-MAC=00:01:5c:6e:2c:73;CM-QOS=1.1;CM-VER=3.1;"
08/15/2020 16:11	82000800	3	"16 consecutive T3 timeouts while trying to range on upstream channel 1;CM-MAC=8c:61:a3:c9:a3:05;CMTS-MAC=00:01:5c:6e:2c:73;CM-QOS=1.1;CM-VER=3.1;"
08/15/2020 16:11	82000600	3	"Unicast Maintenance Ranging attempted - No response - Retries exhausted;CM-MAC=8c:61:a3:c9:a3:05;CMTS-MAC=00:01:5c:6e:2c:73;CM-QOS=1.1;CM-VER=3.1;"
08/15/2020 16:11	82000500	3	"Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=8c:61:a3:c9:a3:05;CMTS-MAC=00:01:5c:6e:2c:73;CM-QOS=1.1;CM-VER=3.1;"
08/15/2020 16:11	82000200	3	"No Ranging Response received - T3 time-out;CM-MAC=8c:61:a3:c9:a3:05;CMTS-MAC=00:01:5c:6e:2c:73;CM-QOS=1.1;CM-VER=3.1;"
08/15/2020 16:11	82000200	3	"No Ranging Response received - T3 time-out;CM-MAC=8c:61:a3:c9:a3:05;CMTS-MAC=00:01:5c:6e:2c:73;CM-QOS=1.1;CM-VER=3.1;"
08/15/2020 16:11	82000800	3	"16 consecutive T3 timeouts while trying to range on upstream channel 2;CM-MAC=8c:61:a3:c9:a3:05;CMTS-MAC=00:01:5c:6e:2c:73;CM-QOS=1.1;CM-VER=3.1;"
08/15/2020 16:11	82000600	3	"Unicast Maintenance Ranging attempted - No response - Retries exhausted;CM-MAC=8c:61:a3:c9:a3:05;CMTS-MAC=00:01:5c:6e:2c:73;CM-QOS=1.1;CM-VER=3.1;"
08/15/2020 16:11	82000500	3	"Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=8c:61:a3:c9:a3:05;CMTS-MAC=00:01:5c:6e:2c:73;CM-QOS=1.1;CM-VER=3.1;"
08/15/2020 16:00	82000200	3	"No Ranging Response received - T3 time-out;CM-MAC=8c:61:a3:c9:a3:05;CMTS-MAC=00:01:5c:6e:2c:73;CM-QOS=1.1;CM-VER=3.1;"
08/15/2020 15:59	82000200	3	"No Ranging Response received - T3 time-out;CM-MAC=8c:61:a3:c9:a3:05;CMTS-MAC=00:01:5c:6e:2c:73;CM-QOS=1.1;CM-VER=3.1;"
08/15/2020 15:59	82000400	3	"Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=8c:61:a3:c9:a3:05;CMTS-MAC=00:01:5c:6e:2c:73;CM-QOS=1.1;CM-VER=3.1;"
08/15/2020 15:59	82000200	3	"No Ranging Response received - T3 time-out;CM-MAC=8c:61:a3:c9:a3:05;CMTS-MAC=00:01:5c:6e:2c:73;CM-QOS=1.1;CM-VER=3.1;"
08/15/2020 15:59	82000400	3	"Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=8c:61:a3:c9:a3:05;CMTS-MAC=00:01:5c:6e:2c:73;CM-QOS=1.1;CM-VER=3.1;"
08/15/2020 15:59	82000200	3	"No Ranging Response received - T3 time-out;CM-MAC=8c:61:a3:c9:a3:05;CMTS-MAC=00:01:5c:6e:2c:73;CM-QOS=1.1;CM-VER=3.1;"
08/15/2020 15:59	82000400	3	"Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=8c:61:a3:c9:a3:05;CMTS-MAC=00:01:5c:6e:2c:73;CM-QOS=1.1;CM-VER=3.1;"
08/15/2020 15:58	82000200	3	"No Ranging Response received - T3 time-out;CM-MAC=8c:61:a3:c9:a3:05;CMTS-MAC=00:01:5c:6e:2c:73;CM-QOS=1.1;CM-VER=3.1;"
08/15/2020 15:57	82000200	3	"No Ranging Response received - T3 time-out;CM-MAC=8c:61:a3:c9:a3:05;CMTS-MAC=00:01:5c:6e:2c:73;CM-QOS=1.1;CM-VER=3.1;"
08/15/2020 15:57	82000200	3	"No Ranging Response received - T3 time-out;CM-MAC=8c:61:a3:c9:a3:05;CMTS-MAC=00:01:5c:6e:2c:73;CM-QOS=1.1;CM-VER=3.1;"
08/15/2020 15:56	82000200	3	"No Ranging Response received - T3 time-out;CM-MAC=8c:61:a3:c9:a3:05;CMTS-MAC=00:01:5c:6e:2c:73;CM-QOS=1.1;CM-VER=3.1;"
08/15/2020 15:56	82000200	3	"No Ranging Response received - T3 time-out;CM-MAC=8c:61:a3:c9:a3:05;CMTS-MAC=00:01:5c:6e:2c:73;CM-QOS=1.1;CM-VER=3.1;"
08/15/2020 15:55	82000500	3	"Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=8c:61:a3:c9:a3:05;CMTS-MAC=00:01:5c:6e:2c:73;CM-QOS=1.1;CM-VER=3.1;"
08/15/2020 15:55	82000200	3	"No Ranging Response received - T3 time-out;CM-MAC=8c:61:a3:c9:a3:05;CMTS-MAC=00:01:5c:6e:2c:73;CM-QOS=1.1;CM-VER=3.1;"
08/15/2020 15:55	82000500	3	"Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=8c:61:a3:c9:a3:05;CMTS-MAC=00:01:5c:6e:2c:73;CM-QOS=1.1;CM-VER=3.1;"
08/15/2020 15:55	82000200	3	"No Ranging Response received - T3 time-out;CM-MAC=8c:61:a3:c9:a3:05;CMTS-MAC=00:01:5c:6e:2c:73;CM-QOS=1.1;CM-VER=3.1;"
08/15/2020 15:55	82000500	3	"Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=8c:61:a3:c9:a3:05;CMTS-MAC=00:01:5c:6e:2c:73;CM-QOS=1.1;CM-VER=3.1;"
08/15/2020 15:55	82000800	3	"16 consecutive T3 timeouts while trying to range on upstream channel 2;CM-MAC=8c:61:a3:c9:a3:05;CMTS-MAC=00:01:5c:6e:2c:73;CM-QOS=1.1;CM-VER=3.1;"
08/15/2020 15:55	82000600	3	"Unicast Maintenance Ranging attempted - No response - Retries exhausted;CM-MAC=8c:61:a3:c9:a3:05;CMTS-MAC=00:01:5c:6e:2c:73;CM-QOS=1.1;CM-VER=3.1;"
08/15/2020 15:55	82000500	3	"Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=8c:61:a3:c9:a3:05;CMTS-MAC=00:01:5c:6e:2c:73;CM-QOS=1.1;CM-VER=3.1;"
08/15/2020 14:37	82000200	3	"No Ranging Response received - T3 time-out;CM-MAC=8c:61:a3:c9:a3:05;CMTS-MAC=00:01:5c:6e:2c:73;CM-QOS=1.1;CM-VER=3.1;"

Startup Procedure

Procedure	Status	Comment
Acquire Downstream Channel	549000000 Hz	Locked
Connectivity State	OK	Operational
Boot State	OK	Operational
Configuration File	OK
Security	Enabled	BPI+
DOCSIS Network Access Enabled	Allowed

Downstream Bonded Channels

Channel ID	Lock Status	Modulation	Frequency	Power	SNR/MER	Corrected	Uncorrectables
17	Locked	QAM256	549000000 Hz	-9.1 dBmV	36.0 dB	0	0
6	Locked	QAM256	477000000 Hz	-9.9 dBmV	35.6 dB	0	0
7	Locked	QAM256	483000000 Hz	-8.6 dBmV	35.6 dB	0	0
8	Locked	QAM256	489000000 Hz	-8.9 dBmV	35.9 dB	0	0
9	Locked	QAM256	495000000 Hz	-9.1 dBmV	35.9 dB	0	0
10	Locked	QAM256	507000000 Hz	-8.8 dBmV	36.1 dB	0	0
11	Locked	QAM256	513000000 Hz	-8.7 dBmV	36.1 dB	0	0
12	Locked	QAM256	519000000 Hz	-8.6 dBmV	36.0 dB	0	0
13	Locked	QAM256	525000000 Hz	-8.4 dBmV	36.2 dB	0	0
14	Locked	QAM256	531000000 Hz	-8.7 dBmV	36.1 dB	0	0
15	Locked	QAM256	537000000 Hz	-8.9 dBmV	36.1 dB	0	0
16	Locked	QAM256	543000000 Hz	-7.9 dBmV	36.0 dB	0	0
18	Locked	QAM256	555000000 Hz	-8.9 dBmV	36.0 dB	0	0
19	Locked	QAM256	561000000 Hz	-8.5 dBmV	36.0 dB	0	0
20	Locked	QAM256	567000000 Hz	-9.4 dBmV	36.0 dB	0	0
21	Locked	QAM256	573000000 Hz	-9.0 dBmV	36.0 dB	0	0
22	Locked	QAM256	579000000 Hz	-9.5 dBmV	36.0 dB	0	0
23	Locked	QAM256	585000000 Hz	-8.7 dBmV	35.9 dB	0	0
24	Locked	QAM256	591000000 Hz	-9.8 dBmV	35.8 dB	0	0
25	Locked	QAM256	597000000 Hz	-8.8 dBmV	35.7 dB	0	0
26	Locked	QAM256	603000000 Hz	-8.6 dBmV	35.8 dB	0	0
27	Locked	QAM256	609000000 Hz	-9.9 dBmV	35.4 dB	0	0
28	Locked	QAM256	615000000 Hz	-8.9 dBmV	35.6 dB	0	0
29	Locked	QAM256	621000000 Hz	-9.5 dBmV	35.5 dB	0	0
30	Locked	QAM256	627000000 Hz	-10.2 dBmV	35.4 dB	0	0
31	Locked	QAM256	633000000 Hz	-10.0 dBmV	35.0 dB	0	0
32	Locked	QAM256	639000000 Hz	-10.2 dBmV	35.4 dB	0	0
33	Locked	QAM256	645000000 Hz	-10.4 dBmV	35.4 dB	0	0
34	Locked	QAM256	651000000 Hz	-10.9 dBmV	35.4 dB	0	0
35	Locked	QAM256	657000000 Hz	-10.0 dBmV	35.4 dB	0	0
36	Locked	QAM256	663000000 Hz	-10.3 dBmV	35.4 dB	0	0
37	Locked	Other	678000000 Hz	-10.1 dBmV	33.5 dB	48237110	0

Upstream Bonded Channels

Channel	Channel ID	Lock Status	US Channel Type	Frequency	Width	Power
1	3	Locked	SC-QAM Upstream	22800000 Hz	6400000 Hz	46.0 dBmV
2	1	Locked	SC-QAM Upstream	35600000 Hz	6400000 Hz	47.0 dBmV
3	2	Locked	SC-QAM Upstream	29200000 Hz	6400000 Hz	46.0 dBmV
4	4	Locked	SC-QAM Upstream	16400000 Hz	6400000 Hz	47.0 dBmV

Current System Time: Sat Aug 15 21:22:14 2020

[CCAndrew]

Take a look at your cables and cable setup. Your downstream levels are either out of spec or close to it. Downstream SNR is sketchy across the board too

[samalluck]

Okay so I reduced the splitters between me and the cable line coming in. I see an improvement in the downstream power levels but I'm still getting dropouts due to dynamic window range exceedances. Thoughts?

Downstream Bonded Channels
Channel ID Lock Status Modulation Frequency Power SNR/MER Corrected Uncorrectables
9 Locked QAM256 495000000 Hz -0.3 dBmV 36.5 dB 0 0
1 Locked QAM256 447000000 Hz -2.0 dBmV 36.4 dB 0 0
2 Locked QAM256 453000000 Hz -2.5 dBmV 36.3 dB 0 0
3 Locked QAM256 459000000 Hz -2.2 dBmV 36.1 dB 0 0
4 Locked QAM256 465000000 Hz -1.2 dBmV 35.9 dB 0 0
5 Locked QAM256 471000000 Hz -1.2 dBmV 36.0 dB 0 0
6 Locked QAM256 477000000 Hz -1.2 dBmV 36.3 dB 0 0
7 Locked QAM256 483000000 Hz -0.2 dBmV 36.3 dB 0 0
8 Locked QAM256 489000000 Hz -0.2 dBmV 36.6 dB 0 0
10 Locked QAM256 507000000 Hz 0.4 dBmV 36.7 dB 0 0
11 Locked QAM256 513000000 Hz -0.4 dBmV 36.6 dB 0 0
12 Locked QAM256 519000000 Hz 0.1 dBmV 36.6 dB 0 0
13 Locked QAM256 525000000 Hz 0.6 dBmV 36.7 dB 0 0
14 Locked QAM256 531000000 Hz -0.4 dBmV 36.5 dB 0 0
15 Locked QAM256 537000000 Hz 0.0 dBmV 36.5 dB 0 0
16 Locked QAM256 543000000 Hz 0.5 dBmV 36.5 dB 0 0
17 Locked QAM256 549000000 Hz -0.3 dBmV 36.5 dB 0 0
18 Locked QAM256 555000000 Hz -0.4 dBmV 36.4 dB 0 0
19 Locked QAM256 561000000 Hz 0.0 dBmV 36.5 dB 0 0
20 Locked QAM256 567000000 Hz -0.3 dBmV 36.5 dB 0 0
21 Locked QAM256 573000000 Hz -0.9 dBmV 36.3 dB 0 0
22 Locked QAM256 579000000 Hz 0.0 dBmV 36.4 dB 0 0
23 Locked QAM256 585000000 Hz -0.1 dBmV 36.4 dB 0 0
24 Locked QAM256 591000000 Hz -0.7 dBmV 36.4 dB 0 0
25 Locked QAM256 597000000 Hz 0.2 dBmV 36.3 dB 0 0
26 Locked QAM256 603000000 Hz 0.1 dBmV 36.2 dB 0 0
27 Locked QAM256 609000000 Hz -0.7 dBmV 36.0 dB 0 0
37 Locked Other 678000000 Hz -0.4 dBmV 34.5 dB 107464278 0
38 Not Locked QAM256 0 Hz 0.0 dBmV 36.7 dB 0 0
39 Locked QAM256 423000000 Hz -1.0 dBmV 36.7 dB 0 0
40 Locked QAM256 429000000 Hz -1.0 dBmV 36.6 dB 0 0
41 Locked QAM256 435000000 Hz -2.2 dBmV 36.4 dB 0 0


Upstream Bonded Channels
Channel Channel ID Lock Status US Channel Type Frequency Width Power
1 2 Locked SC-QAM Upstream 29200000 Hz 6400000 Hz 51.0 dBmV
2 1 Locked SC-QAM Upstream 35600000 Hz 6400000 Hz 41.0 dBmV
3 3 Locked SC-QAM Upstream 22800000 Hz 6400000 Hz 42.0 dBmV
4 4 Locked SC-QAM Upstream 16400000 Hz 6400000 Hz 42.0 dBmV


Current System Time: Tue Aug 18 18:53:41 2020

Date Time Event ID Event Level Description
08/18/2020 18:53 2436694061 5 "Dynamic Range Window violation"
08/18/2020 18:53 82001200 5 "RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRW;CM-MAC=8c:61:a3:c9:a3:05;CMTS-MAC=00:01:5c:6e:2c:73;CM-QOS=1.1;CM-VER=3.1;"
08/18/2020 18:52 2436694061 5 "Dynamic Range Window violation"
08/18/2020 18:52 82001200 5 "RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRW;CM-MAC=8c:61:a3:c9:a3:05;CMTS-MAC=00:01:5c:6e:2c:73;CM-QOS=1.1;CM-VER=3.1;"
08/18/2020 18:52 2436694061 5 "Dynamic Range Window violation"
08/18/2020 18:52 82001200 5 "RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRW;CM-MAC=8c:61:a3:c9:a3:05;CMTS-MAC=00:01:5c:6e:2c:73;CM-QOS=1.1;CM-VER=3.1;"
08/18/2020 18:52 2436694061 5 "Dynamic Range Window violation"
08/18/2020 18:52 82001200 5 "RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRW;CM-MAC=8c:61:a3:c9:a3:05;CMTS-MAC=00:01:5c:6e:2c:73;CM-QOS=1.1;CM-VER=3.1;"
08/18/2020 18:52 2436694061 5 "Dynamic Range Window violation"
08/18/2020 18:52 82001200 5 "RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRW;CM-MAC=8c:61:a3:c9:a3:05;CMTS-MAC=00:01:5c:6e:2c:73;CM-QOS=1.1;CM-VER=3.1;"
08/18/2020 18:52 2436694061 5 "Dynamic Range Window violation"
08/18/2020 18:52 82001200 5 "RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRW;CM-MAC=8c:61:a3:c9:a3:05;CMTS-MAC=00:01:5c:6e:2c:73;CM-QOS=1.1;CM-VER=3.1;"
08/18/2020 18:52 2436694061 5 "Dynamic Range Window violation"