on 01-08-2024 16:06
Hey VM community.
There's a long running issue in my area that is progressively getting worse with it now occurring multiple times a day for extended periods. It looks to be a noise issue with SNR on some channels occasionally dropping to 0.
Weirdly enough it only affects download speeds and latency.
I'm IT inclined and have tried the usual troubleshooting but this looks to be something a VM engineer will have to resolve.
Gig1.
Hub5.
Modem Mode.
Here's a speedtest showing the issue.
My BQM for today.
Modem Stats:
Modem was restarted 30 mins before these readings.
Cable Modem StatusItem Status TypeChannel Overview Downstream Upstream
Cable Modem Status | Online | DOCSIS 3.0 |
Primary downstream channel | Locked | SC-QAM |
DOCSIS 3.0 channels | 30 | 5 |
DOCSIS 3.1 channels | 1 | 1 |
3.0 Downstream channels
1 | 611000000 | -7.8 | 34 | QAM 256 | 32 |
2 | 387000000 | -8.3 | 27 | QAM 256 | 4 |
3 | 419000000 | -8 | 31 | QAM 256 | 8 |
4 | 427000000 | -7.8 | 28 | QAM 256 | 9 |
5 | 451000000 | -8.3 | 34 | QAM 256 | 12 |
6 | 459000000 | -8.5 | 33 | QAM 256 | 13 |
7 | 483000000 | -8.6 | 33 | QAM 256 | 16 |
8 | 491000000 | -8.7 | 32 | QAM 256 | 17 |
9 | 515000000 | -8.7 | 32 | QAM 256 | 20 |
10 | 523000000 | -8.4 | 32 | QAM 256 | 21 |
11 | 547000000 | -7.6 | 31 | QAM 256 | 24 |
12 | 555000000 | -7.2 | 32 | QAM 256 | 25 |
13 | 579000000 | -7.1 | 33 | QAM 256 | 28 |
14 | 587000000 | -7.2 | 34 | QAM 256 | 29 |
15 | 603000000 | -7.7 | 35 | QAM 256 | 31 |
16 | 619000000 | -7.8 | 33 | QAM 256 | 33 |
17 | 627000000 | -7.9 | 35 | QAM 256 | 34 |
18 | 635000000 | -8.3 | 35 | QAM 256 | 35 |
19 | 643000000 | -8.4 | 34 | QAM 256 | 36 |
20 | 651000000 | -8.5 | 34 | QAM 256 | 37 |
21 | 659000000 | -8.4 | 34 | QAM 256 | 38 |
22 | 667000000 | -8.5 | 34 | QAM 256 | 39 |
23 | 675000000 | -8.5 | 34 | QAM 256 | 40 |
24 | 683000000 | -8.1 | 35 | QAM 256 | 41 |
25 | 691000000 | -8.7 | 34 | QAM 256 | 42 |
26 | 699000000 | -8.9 | 34 | QAM 256 | 43 |
27 | 707000000 | -8.8 | 35 | QAM 256 | 44 |
28 | 715000000 | -8.9 | 34 | QAM 256 | 45 |
29 | 723000000 | -9.2 | 35 | QAM 256 | 46 |
30 | 731000000 | -9.6 | 34 | QAM 256 | 47 |
3.0 Downstream channels
1 | Locked | 34 | 34950 | 0 |
2 | Locked | 27 | 61932464 | 6231823 |
3 | Locked | 31 | 3899618 | 0 |
4 | Locked | 28 | 66176698 | 676589 |
5 | Locked | 34 | 5001343 | 64 |
6 | Locked | 33 | 14276929 | 508 |
7 | Locked | 33 | 100962 | 0 |
8 | Locked | 32 | 541764 | 0 |
9 | Locked | 32 | 434429 | 0 |
10 | Locked | 32 | 2930016 | 4 |
11 | Locked | 31 | 3918411 | 51 |
12 | Locked | 32 | 316758 | 16 |
13 | Locked | 33 | 89525 | 0 |
14 | Locked | 34 | 9992 | 0 |
15 | Locked | 35 | 5235 | 0 |
16 | Locked | 33 | 79490 | 0 |
17 | Locked | 35 | 2140 | 0 |
18 | Locked | 35 | 1828 | 0 |
19 | Locked | 34 | 3610 | 0 |
20 | Locked | 34 | 3235 | 0 |
21 | Locked | 34 | 4499 | 0 |
22 | Locked | 34 | 18789 | 0 |
23 | Locked | 34 | 11354 | 0 |
24 | Locked | 35 | 2622 | 0 |
25 | Locked | 34 | 7266 | 0 |
26 | Locked | 34 | 7286 | 0 |
27 | Locked | 35 | 4218 | 0 |
28 | Locked | 34 | 8111 | 433 |
29 | Locked | 35 | 4441 | 1887 |
30 | Locked | 34 | 5141 | 0 |
3.1 Downstream channels
159 | 190 | 4K | 3736 | QAM 4096 | 148 |
3.1 Downstream channels
159 | Locked | 34 | -11.1 | 61465322 | 27634850 |
3.0 Upstream channels
0 | 49600000 | 55.3 | 5120 | QAM 64 | 1 |
1 | 43100000 | 54.8 | 5120 | QAM 64 | 2 |
2 | 36600000 | 54.5 | 5120 | QAM 64 | 3 |
3 | 30100000 | 54.3 | 5120 | QAM 64 | 4 |
4 | 23600000 | 53.3 | 5120 | QAM 64 | 5 |
3.0 Upstream channels
0 | ATDMA | 0 | 0 | 0 | 0 |
1 | ATDMA | 0 | 0 | 0 | 0 |
2 | ATDMA | 0 | 0 | 4 | 0 |
3 | ATDMA | 0 | 0 | 0 | 0 |
4 | ATDMA | 0 | 0 | 0 | 0 |
3.1 Upstream channels
6 | 10 | 49.0 | 2K | QAM 256 |
3.1 Upstream channels
6 | OFDMA | 200 | 74000000 | 0 | 0 |
on 01-08-2024 16:06
Network Log
01-08-2024 15:51:02 | notice | CM-STATUS message sent. Event Type Code: 4; Chan ID: 4; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1; |
01-08-2024 15:50:52 | warning | MDD message timeout;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1; |
01-08-2024 15:41:41 | notice | CM-STATUS message sent. Event Type Code: 4; Chan ID: 4; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1; |
01-08-2024 15:41:22 | warning | MDD message timeout;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1; |
01-08-2024 15:34:53 | notice | CM-STATUS message sent. Event Type Code: 4; Chan ID: 4; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1; |
01-08-2024 15:34:42 | warning | MDD message timeout;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1; |
01-08-2024 15:28:42 | notice | CM-STATUS message sent. Event Type Code: 16; Chan ID: 159; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: 3.;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1; |
01-08-2024 15:28:23 | notice | US profile assignment change. US Chan ID: 6; Previous Profile: 13; New Profile: 11 13.;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1; |
01-08-2024 15:28:23 | warning | DBC-REQ Mismatch Between Calculated Value for P1.6hi Compared to CCAP Provided Value;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1; |
01-08-2024 15:28:19 | notice | REGISTRATION COMPLETE - Waiting for Operational status |
01-08-2024 15:28:14 | warning | RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRW;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1; |
01-08-2024 15:28:14 | warning | Dynamic Range Window violation |
01-08-2024 15:28:14 | warning | REG-RSP-MP Mismatch Between Calculated Value for P1.6hi Compared to CCAP Provided Value;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1; |
01-08-2024 15:28:14 | warning | RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRW;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1; |
01-08-2024 15:28:14 | warning | RCS Partial Service;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1; |
01-08-2024 15:28:14 | warning | RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRW;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1; |
01-08-2024 15:28:14 | warning | Dynamic Range Window violation |
01-08-2024 15:28:14 | warning | Dynamic Range Window violation |
01-08-2024 15:28:14 | warning | Dynamic Range Window violation |
01-08-2024 15:28:14 | warning | RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRW;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1; |
01-08-2024 15:28:08 | notice | DS profile assignment change. DS Chan ID: 32; Previous Profile: ; New Profile: 1 2 3.;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1; |
01-08-2024 15:28:04 | notice | TLV-11 - unrecognized OID;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1; |
01-08-2024 15:28:02 | warning | DHCP WARNING - Non-critical field invalid in response ;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1; |
01-08-2024 15:28:00 | notice | Honoring MDD; IP provisioning mode = IPv4 |
01-08-2024 15:27:26 | critical | No Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1; |
01-08-2024 15:27:20 | critical | SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1; |
01-08-2024 15:27:19 | critical | Cable Modem Reboot because of - HW or Power-On Reset |
23-07-2024 09:51:54 | critical | No Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1; |
23-07-2024 09:51:48 | critical | SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1; |
23-07-2024 09:51:47 | critical | Cable Modem Reboot because of - HW or Power-On Reset |
22-07-2024 14:47:09 | critical | No Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1; |
22-07-2024 14:47:01 | critical | SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1; |
01-08-2024 16:24 - edited 01-08-2024 16:25
The Downstream power levels should be between -7 to +7 with a max of +10 dBmV
most channels are too low resulting in many errors that can not be corrected.
3.0 Downstream channels
1 | 611000000 | -7.8 | 34 | QAM 256 | 32 |
2 | 387000000 | -8.3 | 27 | QAM 256 | 4 |
3 | 419000000 | -8 | 31 | QAM 256 | 8 |
4 | 427000000 | -7.8 | 28 | QAM 256 | 9 |
5 | 451000000 | -8.3 | 34 | QAM 256 | 12 |
6 | 459000000 | -8.5 | 33 | QAM 256 | 13 |
7 | 483000000 | -8.6 | 33 | QAM 256 | 16 |
8 | 491000000 | -8.7 | 32 | QAM 256 | 17 |
9 | 515000000 | -8.7 | 32 | QAM 256 | 20 |
10 | 523000000 | -8.4 | 32 | QAM 256 | 21 |
3.1 Downstream channels
159 | Locked | 34 | -11.1 | 61465322 | 27634850 |
on 03-08-2024 17:35
Hi Zoomeh
Thanks for your post, welcome to the Community Forums.
Sorry to see you're having trouble with your connection and speeds. You're quite right, your downstream channels are too low and so we'll need to get an engineer out to take a look. There's no known outages in your area that could be causing this by the looks of it.
I've dropped you a PM 😊
on 04-08-2024 17:29
Have you thought about moving home, it'll be quicker, easier and less stressful than getting a reliable service from this crowd.
on 14-08-2024 11:25
Happy to report that I had a competent engineer who replaced everything except the main coax run to my property and sorted out the mess in the cab which has brought the power levels back in to spec and solved the dropouts and speed issues.
Cheers.