04-04-2023 11:47 - edited 04-04-2023 11:51
I have a Hub 5, and there are many Pre and Post-RS errors on a single downstream channel. I was wondering if anyone could tell me if there is anything in the house that can cause interference on channel 8 (187000000Hz). I have tightened the cable and checked to see if anything would cause the cable to be deformed etc.
I have had 2 engineer visits, and they blame modem mode, but I do not know how that can cause it. I have packet loss and reduced speeds (around 300Mbps instead of 350-380Mbps). I have provided the router stats below.
on 04-04-2023 11:49
Cable Modem Status | ||
Item | Status | Comments |
Acquired Downstream Channel(Hz) | 259000000 | Locked |
Ranged Upstream Channel(Hz) | 49600000 | Ranged |
Provisioning State | Online | Operational |
Downstream bonded channels
Channel | Frequency (Hz) | Power (dBmV) | SNR (dB) | Modulation | Channel ID |
1 | 259000000 | 3.5 | 40 | QAM 256 | 16 |
2 | 139000000 | 7.3 | 39 | QAM 256 | 1 |
3 | 147000000 | 7.2 | 40 | QAM 256 | 2 |
4 | 155000000 | 7.1 | 39 | QAM 256 | 3 |
5 | 163000000 | 6.8 | 39 | QAM 256 | 4 |
6 | 171000000 | 6.6 | 40 | QAM 256 | 5 |
7 | 179000000 | 6.6 | 40 | QAM 256 | 6 |
8 | 187000000 | 6.4 | 40 | QAM 256 | 7 |
9 | 195000000 | 6.1 | 40 | QAM 256 | 8 |
10 | 203000000 | 5.7 | 40 | QAM 256 | 9 |
11 | 211000000 | 5.7 | 39 | QAM 256 | 10 |
12 | 219000000 | 5.1 | 40 | QAM 256 | 11 |
13 | 227000000 | 4.9 | 40 | QAM 256 | 12 |
14 | 235000000 | 4.9 | 40 | QAM 256 | 13 |
15 | 243000000 | 4.7 | 40 | QAM 256 | 14 |
16 | 251000000 | 4.2 | 40 | QAM 256 | 15 |
17 | 267000000 | 3.4 | 40 | QAM 256 | 17 |
18 | 275000000 | 3.3 | 40 | QAM 256 | 18 |
19 | 283000000 | 3.7 | 40 | QAM 256 | 19 |
20 | 291000000 | 4.5 | 40 | QAM 256 | 20 |
21 | 299000000 | 4.9 | 40 | QAM 256 | 21 |
22 | 307000000 | 4.9 | 40 | QAM 256 | 22 |
23 | 315000000 | 4.8 | 40 | QAM 256 | 23 |
24 | 323000000 | 4.9 | 40 | QAM 256 | 24 |
25 | 331000000 | 4.8 | 40 | QAM 256 | 25 |
26 | 339000000 | 5 | 40 | QAM 256 | 26 |
27 | 347000000 | 5.2 | 40 | QAM 256 | 27 |
28 | 355000000 | 5.4 | 40 | QAM 256 | 28 |
29 | 363000000 | 5.2 | 40 | QAM 256 | 29 |
30 | 371000000 | 5.2 | 40 | QAM 256 | 30 |
31 | 379000000 | 5.6 | 40 | QAM 256 | 31 |
04-04-2023 11:49 - edited 04-04-2023 11:50
Downstream bonded channels
Channel | Locked Status | RxMER (dB) | Pre RS Errors | Post RS Errors |
1 | Locked | 40 | 0 | 0 |
2 | Locked | 39 | 4 | 0 |
3 | Locked | 40 | 2 | 0 |
4 | Locked | 39 | 1 | 0 |
5 | Locked | 39 | 4 | 0 |
6 | Locked | 40 | 4 | 0 |
7 | Locked | 40 | 2 | 0 |
8 | Locked | 40 | 631 | 2841 |
9 | Locked | 40 | 1 | 0 |
10 | Locked | 40 | 1 | 0 |
11 | Locked | 39 | 0 | 0 |
12 | Locked | 40 | 3 | 0 |
13 | Locked | 40 | 4 | 0 |
14 | Locked | 40 | 2 | 0 |
15 | Locked | 40 | 2 | 0 |
16 | Locked | 40 | 0 | 0 |
17 | Locked | 40 | 0 | 0 |
18 | Locked | 40 | 0 | 0 |
19 | Locked | 40 | 0 | 0 |
20 | Locked | 40 | 1 | 0 |
21 | Locked | 40 | 0 | 0 |
22 | Locked | 40 | 0 | 0 |
23 | Locked | 40 | 1 | 0 |
24 | Locked | 40 | 2 | 0 |
25 | Locked | 40 | 1 | 0 |
26 | Locked | 40 | 0 | 0 |
27 | Locked | 40 | 1 | 0 |
28 | Locked | 40 | 1 | 0 |
29 | Locked | 40 | 1 | 0 |
30 | Locked | 40 | 1 | 0 |
31 | Locked | 40 | 0 | 0 |
on 04-04-2023 11:50
Upstream bonded channels
Channel | Frequency (Hz) | Power (dBmV) | Symbol Rate (ksps) | Modulation | Channel ID |
0 | 49600000 | 41.8 | 5120 | QAM 64 | 1 |
1 | 43100000 | 41.3 | 5120 | QAM 64 | 2 |
2 | 36600000 | 40.8 | 5120 | QAM 64 | 3 |
3 | 30100000 | 40 | 5120 | QAM 64 | 4 |
4 | 23600000 | 39.8 | 5120 | QAM 64 | 5 |
Upstream bonded channels
Channel | Channel Type | T1 Timeouts | T2 Timeouts | T3 Timeouts | T4 Timeouts |
0 | ATDMA | 0 | 0 | 0 | 0 |
1 | ATDMA | 0 | 0 | 0 | 0 |
2 | ATDMA | 0 | 0 | 0 | 0 |
3 | ATDMA | 0 | 0 | 0 | 0 |
4 | ATDMA | 0 | 0 | 0 | 0 |
on 04-04-2023 11:50
General Configuration
Network access | Allowed |
Maximum Number of CPEs | 3 |
Baseline Privacy | Enabled |
DOCSIS Mode | 3.1 |
Config file | DHSUBsgvca69834ncxv9873254k;f |
Primary Downstream Service Flow
SFID | 5287 |
Max Traffic Rate | 402500089 bps |
Max Traffic Burst | 42600bytes |
Min Traffic Rate | 0 bps |
SFID | 21338 |
Max Traffic Rate | 128000 bps |
Max Traffic Burst | 4000bytes |
Min Traffic Rate | 0 bps |
Primary Upstream Service Flow
SFID | 6721 |
Max Traffic Rate | 38500089 bps |
Max Traffic Burst | 42600bytes |
Min Traffic Rate | 0 bps |
Max Concatenated Burst | 42600bytes |
Scheduling Type | Best Effort |
SFID | 26330 |
Max Traffic Rate | 128000 bps |
Max Traffic Burst | 4000bytes |
Min Traffic Rate | 0 bps |
Max Concatenated Burst | 1522bytes |
Scheduling Type | Best Effort |
on 04-04-2023 11:51
Network Log
Time | Priority | Description |
04-04-2023 11:40:52 | 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; |
04-04-2023 11:40:52 | 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; |
04-04-2023 10:50:26 | 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; |
04-04-2023 10:50:26 | notice | US profile assignment change. US Chan ID: 6; Previous Profile: 12 13; New Profile: 13.;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1; |
04-04-2023 10:40:46 | notice | US profile assignment change. US Chan ID: 6; Previous Profile: 11 13; New Profile: 12 13.;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1; |
04-04-2023 10:40:46 | 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; |
04-04-2023 10:40:22 | 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; |
04-04-2023 10:40:22 | 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; |
04-04-2023 09:37:28 | 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; |
04-04-2023 09:37:28 | notice | US profile assignment change. US Chan ID: 6; Previous Profile: 12 13; New Profile: 13.;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1; |
04-04-2023 09:29:59 | 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; |
04-04-2023 09:29:59 | notice | US profile assignment change. US Chan ID: 6; Previous Profile: 11 13; New Profile: 12 13.;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1; |
04-04-2023 07:59:13 | 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; |
04-04-2023 07:59:13 | notice | US profile assignment change. US Chan ID: 6; Previous Profile: 12 13; New Profile: 11 13.;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1; |
04-04-2023 07:49:06 | notice | US profile assignment change. US Chan ID: 6; Previous Profile: 11 13; New Profile: 12 13.;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1; |
04-04-2023 07:49:06 | 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; |
04-04-2023 04:57:31 | notice | US profile assignment change. US Chan ID: 6; Previous Profile: 12 13; New Profile: 11 13.;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1; |
04-04-2023 04:57:31 | 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; |
04-04-2023 03:56:47 | 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; |
04-04-2023 03:56:47 | notice | US profile assignment change. US Chan ID: 6; Previous Profile: 11 13; New Profile: 12 13.;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1; |
04-04-2023 03:27:05 | notice | CM-STATUS message sent. Event Type Code: 3; Chan ID: N/A; DSID: 830767; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.1; |
04-04-2023 03:26:56 | warning | Unicast DSID PSN startup error |
04-04-2023 03:26:47 | 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; |
04-04-2023 03:26:47 | 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; |
04-04-2023 03:26:43 | notice | REGISTRATION COMPLETE - Waiting for Operational status |
04-04-2023 03:26:37 | 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; |
04-04-2023 03:26:37 | 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; |
04-04-2023 03:26:37 | warning | Dynamic Range Window violation |
04-04-2023 03:26:37 | warning | Dynamic Range Window violation |
04-04-2023 03:26:37 | warning | Dynamic Range Window violation |
04-04-2023 03:26:37 | warning | Dynamic Range Window violation |
04-04-2023 03:26:37 | 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; |
on 05-04-2023 13:51
Hi,
Seems to be getting worse, with upstream now being affected. The upstream modulation is now at 16QAM instead of 64QAM. I don't see how modem mode is causing this, as I am now on router mode.
Upstream bonded channels
0 | 49600000 | 41.5 | 5120 | QAM 16 | 1 |
1 | 43100000 | 41 | 5120 | QAM 16 | 2 |
2 | 36600000 | 40.8 | 5120 | QAM 16 | 3 |
3 | 30100000 | 40.5 | 5120 | QAM 16 | 4 |
4 | 23600000 | 40 | 5120 | QAM 16 | 5 |
05-04-2023 14:14 - edited 05-04-2023 14:19
The post RS errors are cable noise issues, quite unrelated to Modem mode it was a foolish description of the problem by the engineer.
Provided the Post RS Errors on DS Channel 8 are not continuing to rise, that could have been a past fault that has since cleared.
If the errors continue to rise, noise in entering the cable, there may be loose connection or a damaged coax cable.
on 06-04-2023 11:28
It has increased significantly now can one of the members of the VM forum team book me an appointment with an engineer please?
on 07-04-2023 12:42
@fjama13 wrote:It has increased significantly now can one of the members of the VM forum team book me an appointment with an engineer please?
If its just one channel that has an issue it won't matter as there are many other bonded channels looking good and there is enough capacity for your speed using those. If there are several channels and the rate keeps going up then that's an issue of noise.