Still an area problem in N2
Hi Forum team. In a previous post I reported that a VM network engineer appeared to track down the main cause of the area outages to excessive upstream noise, and had replaced various components in the street cabinets on 8 August (power supply, amplifier and splitters I believe). Since then, we don't appear to have suffered any complete outages, but we are still experiencing periods of partial packet loss lasting maybe 10 minutes, and occasionally longer, which are intermittently affecting both internet use, normal TV reception and TV catchup services. I can provide daily charts from the TB quality monitor to verify.
As before, a number of neighbours report problems at the same time, so it seems still to be an area problem. As for my own hub, signal levels and S/N all appear OK, but downstream errors are truly astronomical hitting 10 or 11 million pre and post errors after 6 days of operation: see below. This surely is way out of normal, and presumably indicates we still have a noise problem?
Can you please advise how we can best escalate this issue? Thank you. NF
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Cable Modem Status
Acquired Downstream Channel (Hz) 195000000 Locked
Ranged Upstream Channel (Hz) 43100000 Locked
Provisioning State Online
Downstream bonded channels
Channel Frequency (Hz) Power (dBmV) SNR (dB) Modulation Channel ID
1 195000000 5 40 256 qam 8
2 139000000 3.9 38 256 qam 1
3 147000000 4.5 40 256 qam 2
4 155000000 4.5 40 256 qam 3
5 163000000 4.6 40 256 qam 4
6 171000000 4.9 40 256 qam 5
7 179000000 5 40 256 qam 6
8 187000000 4.9 40 256 qam 7
9 203000000 5.1 40 256 qam 9
10 323000000 5.3 40 256 qam 24
11 331000000 5.8 40 256 qam 25
12 339000000 5.8 40 256 qam 26
13 347000000 5.5 40 256 qam 27
14 355000000 5.5 40 256 qam 28
15 363000000 5.9 40 256 qam 29
16 371000000 6 40 256 qam 30
17 379000000 5.8 40 256 qam 31
18 387000000 5.9 40 256 qam 32
19 395000000 6.1 40 256 qam 34
20 403000000 6.4 40 256 qam 35
21 411000000 6 40 256 qam 36
22 419000000 5.8 40 256 qam 37
23 427000000 6 40 256 qam 38
24 435000000 6.3 40 256 qam 39
Downstream bonded channels
Channel Locked Status RxMER (dB) Pre RS Errors Post RS Errors
1 Locked 40.3 23112 38521
2 Locked 38.9 23046 37142
3 Locked 40.3 16307 30457
4 Locked 40.9 18863 25805
5 Locked 40.3 23881 32087
6 Locked 40.9 23671 32434
7 Locked 40.3 20233 32124
8 Locked 40.3 21125 76385
9 Locked 40.9 24805 308619
10 Locked 40.3 2058999 10986770
11 Locked 40.9 7269840 5735910
12 Locked 40.3 8930521 4061788
13 Locked 40.3 8023098 4985618
14 Locked 40.9 5856537 7170432
15 Locked 40.3 6102311 6928006
16 Locked 40.9 7757572 5249504
17 Locked 40.3 11235933 1671030
18 Locked 40.3 12280124 346672
19 Locked 40.9 11984568 123379
20 Locked 40.9 11545621 86417
21 Locked 40.3 11175458 93308
22 Locked 40.9 10399471 87703
23 Locked 40.9 8579957 76475
24 Locked 40.3 6138423 74627
Upstream bonded channels
Channel Frequency (Hz) Power (dBmV) Symbol Rate (ksps) Modulation Channel ID
1 43100000 42.5 5120 64 qam 2
2 36600000 42.3 5120 64 qam 3
3 23600000 41.8 5120 64 qam 9
4 30100000 41.8 5120 64 qam 4
5 49600000 42.5 5120 64 qam 1
Upstream bonded channels
Channel Channel Type T1 Timeouts T2 Timeouts T3 Timeouts T4 Timeouts
1 ATDMA 0 0 11 0
2 ATDMA 0 0 4 0
3 ATDMA 0 0 9 0
4 ATDMA 0 0 3 0
5 ATDMA 0 0 8 0
General Configuration
Network access Allowed
Maximum Number of CPEs 1
Baseline Privacy Enabled
DOCSIS Mode Docsis30
Config file cmreg-vmdg505-bbt060-b.cm
Primary Downstream Service Flow
SFID 273902
Max Traffic Rate 287500061
Max Traffic Burst 42600
Min Traffic Rate 0
Primary Upstream Service Flow
SFID 273901
Max Traffic Rate 27500061
Max Traffic Burst 42600
Min Traffic Rate 0
Max Concatenated Burst 42600
Scheduling Type BestEffort
Network Log
Time Priority Description
17/08/2025 20:15:39 critical No Ranging Response received - T3 time-out;CM-MAC=xx:xx:xx:xx:xx:xx;CMTS-MAC=xx:xx:xx:xx:xx:xx;CM-QOS=1.1;CM-VER=3.0;
17/08/2025 14:58:40 Error DHCP RENEW WARNING - Field invalid in response v4 option;CM-MAC=xx:xx:xx:xx:xx:xx;CMTS-MAC=xx:xx:xx:xx:xx:xx;CM-QOS=1.1;CM-VER=3.0;
15/08/2025 05:06:35 Warning! RCS Partial Service;CM-MAC=xx:xx:xx:xx:xx:xx;CMTS-MAC=xx:xx:xx:xx:xx:xx;CM-QOS=1.1;CM-VER=3.0;
15/08/2025 05:06:33 critical SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=xx:xx:xx:xx:xx:xx;CMTS-MAC=xx:xx:xx:xx:xx:xx;CM-QOS=1.1;CM-VER=3.0;
15/08/2025 05:06:33 Warning! RCS Partial Service;CM-MAC=xx:xx:xx:xx:xx:xx;CMTS-MAC=xx:xx:xx:xx:xx:xx;CM-QOS=1.1;CM-VER=3.0;
15/08/2025 05:06:33 critical SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=xx:xx:xx:xx:xx:xx;CMTS-MAC=xx:xx:xx:xx:xx:xx;CM-QOS=1.1;CM-VER=3.0;
14/08/2025 02:58:39 Error DHCP RENEW WARNING - Field invalid in response v4 option;CM-MAC=xx:xx:xx:xx:xx:xx;CMTS-MAC=xx:xx:xx:xx:xx:xx;CM-QOS=1.1;CM-VER=3.0;
13/08/2025 15:46:48 Warning! RCS Partial Service;CM-MAC=xx:xx:xx:xx:xx:xx;CMTS-MAC=xx:xx:xx:xx:xx:xx;CM-QOS=1.1;CM-VER=3.0;
13/08/2025 15:46:48 critical SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=xx:xx:xx:xx:xx:xx;CMTS-MAC=xx:xx:xx:xx:xx:xx;CM-QOS=1.1;CM-VER=3.0;
13/08/2025 15:46:8 Warning! RCS Partial Service;CM-MAC=xx:xx:xx:xx:xx:xx;CMTS-MAC=xx:xx:xx:xx:xx:xx;CM-QOS=1.1;CM-VER=3.0;
13/08/2025 15:46:8 critical SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=xx:xx:xx:xx:xx:xx;CMTS-MAC=xx:xx:xx:xx:xx:xx;CM-QOS=1.1;CM-VER=3.0;
13/08/2025 15:46:4 Warning! RCS Partial Service;CM-MAC=xx:xx:xx:xx:xx:xx;CMTS-MAC=xx:xx:xx:xx:xx:xx;CM-QOS=1.1;CM-VER=3.0;
13/08/2025 15:46:4 Warning! Lost MDD Timeout;CM-MAC=xx:xx:xx:xx:xx:xx;CMTS-MAC=xx:xx:xx:xx:xx:xx;CM-QOS=1.1;CM-VER=3.0;
13/08/2025 15:46:4 Warning! RCS Partial Service;CM-MAC=xx:xx:xx:xx:xx:xx;CMTS-MAC=xx:xx:xx:xx:xx:xx;CM-QOS=1.1;CM-VER=3.0;
13/08/2025 15:46:4 Warning! Lost MDD Timeout;CM-MAC=xx:xx:xx:xx:xx:xx;CMTS-MAC=xx:xx:xx:xx:xx:xx;CM-QOS=1.1;CM-VER=3.0;
13/08/2025 15:46:4 Warning! RCS Partial Service;CM-MAC=xx:xx:xx:xx:xx:xx;CMTS-MAC=xx:xx:xx:xx:xx:xx;CM-QOS=1.1;CM-VER=3.0;
13/08/2025 15:45:59 critical SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=xx:xx:xx:xx:xx:xx;CMTS-MAC=xx:xx:xx:xx:xx:xx;CM-QOS=1.1;CM-VER=3.0;
13/08/2025 15:45:59 Warning! RCS Partial Service;CM-MAC=xx:xx:xx:xx:xx:xx;CMTS-MAC=xx:xx:xx:xx:xx:xx;CM-QOS=1.1;CM-VER=3.0;
13/08/2025 15:45:59 critical SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=xx:xx:xx:xx:xx:xx;CMTS-MAC=xx:xx:xx:xx:xx:xx;CM-QOS=1.1;CM-VER=3.0;
13/08/2025 15:45:59 Warning! RCS Partial Service;CM-MAC=xx:xx:xx:xx:xx:xx;CMTS-MAC=xx:xx:xx:xx:xx:xx;CM-QOS=1.1;CM-VER=3.0;
