13-10-2021 21:12 - edited 13-10-2021 21:18
Hi again, I'll have to split the post into various parts due to character limits.
So for a while my connection has been "Less than ideal". (My previous posts reflected this)
However the last week or more it has been worse than usual, ping spikes while having videos playing in the background (even just 1080p music videos)
In fact the spikes are worse than the TBB Graph shows.
Then early this morning(Just after 11AM) I had a full outage (Partial service in logs, which I will post further down), as well as QAM dropping.
Even prior to today, the T3 timeouts that would also occur happened in bursts on each upstream channel. - luckily not
Bit of info:
HP2 Area,
Super hub 3,
Modem mode(although this shouldn't matter, right?)
Graph from today (13th october):
https://www.thinkbroadband.com/broadband/monitoring/quality/share/942d91a395a26f3dd31266c72a6884cb61a6350d-13-10-2021
Live Graph:
https://www.thinkbroadband.com/broadband/monitoring/quality/share/3f9a0c6eff35d57ae0f42e221bb1b8b92039be2d
The larger average latency spikes are from speed tests/people updating stuff on their phones.
I can provide graphs from further back if needed.
On to the logs:
Cable Modem StatusItem Status Comments
Acquired Downstream Channel (Hz) | 699000000 | Locked |
Ranged Upstream Channel (Hz) | 46200000 | Locked |
Provisioning State | Online |
Downstream bonded channels
Channel Frequency (Hz) Power (dBmV) SNR (dB) Modulation Channel ID
1 | 699000000 | 4.5 | 40 | 256 qam | 37 |
2 | 539000000 | 4.5 | 38 | 256 qam | 17 |
3 | 547000000 | 4.9 | 40 | 256 qam | 18 |
4 | 555000000 | 5 | 40 | 256 qam | 19 |
5 | 563000000 | 4.5 | 38 | 256 qam | 20 |
6 | 571000000 | 3.7 | 38 | 256 qam | 21 |
7 | 579000000 | 3.2 | 38 | 256 qam | 22 |
8 | 587000000 | 3.5 | 38 | 256 qam | 23 |
9 | 595000000 | 4 | 38 | 256 qam | 24 |
10 | 603000000 | 4.5 | 38 | 256 qam | 25 |
11 | 611000000 | 4.4 | 40 | 256 qam | 26 |
12 | 619000000 | 4 | 38 | 256 qam | 27 |
13 | 627000000 | 3.7 | 38 | 256 qam | 28 |
14 | 635000000 | 4 | 38 | 256 qam | 29 |
15 | 643000000 | 4.3 | 38 | 256 qam | 30 |
16 | 651000000 | 4.6 | 38 | 256 qam | 31 |
17 | 659000000 | 4.4 | 38 | 256 qam | 32 |
18 | 667000000 | 4.1 | 38 | 256 qam | 33 |
19 | 675000000 | 4 | 38 | 256 qam | 34 |
20 | 683000000 | 4 | 38 | 256 qam | 35 |
21 | 691000000 | 4.5 | 38 | 256 qam | 36 |
22 | 707000000 | 4.3 | 38 | 256 qam | 38 |
23 | 715000000 | 3.7 | 38 | 256 qam | 39 |
24 | 723000000 | 3.4 | 38 | 256 qam | 40 |
I should also note: the power levels before the outage were in the 7 ~ 7.5 range. - unsure if this is of any relevance since they're still in range.
More so just wondering if it's part of the problem.
Downstream bonded channels
Channel Locked Status RxMER (dB) Pre RS Errors Post RS Errors
1 | Locked | 40.3 | 20789 | 1490 |
2 | Locked | 38.9 | 12227 | 1519 |
3 | Locked | 40.3 | 13374 | 1571 |
4 | Locked | 40.3 | 13192 | 1642 |
5 | Locked | 38.9 | 14011 | 1637 |
6 | Locked | 38.9 | 16810 | 1531 |
7 | Locked | 38.9 | 20184 | 2512 |
8 | Locked | 38.6 | 21187 | 2611 |
9 | Locked | 38.6 | 20780 | 1768 |
10 | Locked | 38.9 | 20562 | 1933 |
11 | Locked | 40.3 | 19913 | 2445 |
12 | Locked | 38.9 | 21657 | 3878 |
13 | Locked | 38.6 | 23632 | 3311 |
14 | Locked | 38.6 | 24594 | 1900 |
15 | Locked | 38.6 | 23876 | 2238 |
16 | Locked | 38.9 | 22765 | 2252 |
17 | Locked | 38.6 | 22882 | 1623 |
18 | Locked | 38.9 | 23041 | 4006 |
19 | Locked | 38.9 | 22662 | 3496 |
20 | Locked | 38.6 | 23448 | 2519 |
21 | Locked | 38.9 | 22031 | 2614 |
22 | Locked | 38.6 | 20555 | 2865 |
23 | Locked | 38.6 | 21454 | 2039 |
24 | Locked | 38.9 | 20845 | 3970 |
These post RS haven't raised any higher since the outage happened earlier today.
Upstream bonded channels
Channel Frequency (Hz) Power (dBmV) Symbol Rate (ksps) Modulation Channel ID
1 | 46200000 | 39 | 5120 | 64 qam | 1 |
2 | 39400000 | 38.8 | 5120 | 64 qam | 2 |
3 | 32600000 | 38.5 | 5120 | 16 qam | 3 |
4 | 25800088 | 37.8 | 5120 | 64 qam | 4 |
Upstream bonded channels
Channel Channel Type T1 Timeouts T2 Timeouts T3 Timeouts T4 Timeouts
1 | ATDMA | 0 | 0 | 6 | 0 |
2 | ATDMA | 0 | 0 | 0 | 0 |
3 | ATDMA | 0 | 0 | 0 | 0 |
4 | ATDMA | 0 | 0 | 0 | 0 |
13-10-2021 21:14 - edited 13-10-2021 21:29
General Configuration
Network access | Allowed |
Maximum Number of CPEs | 1 |
Baseline Privacy | Enabled |
DOCSIS Mode | Docsis30 |
Config file | cmreg-vmdg505-bbt057-b.cm |
Primary Downstream Service Flow
SFID | 1201380 |
Max Traffic Rate | 117000047 |
Max Traffic Burst | 42600 |
Min Traffic Rate | 0 |
Primary Upstream Service Flow
SFID | 1201379 |
Max Traffic Rate | 10500047 |
Max Traffic Burst | 16320 |
Min Traffic Rate | 0 |
Max Concatenated Burst | 16320 |
Scheduling Type | BestEffort |
Network Log
Time Priority Description
13/10/2021 10:39:54 | Warning! | RCS Partial Service;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0; |
13/10/2021 10:39:54 | critical | SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0; |
13/10/2021 10:39:53 | Warning! | RCS Partial Service;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0; |
13/10/2021 10:39:50 | critical | SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0; |
13/10/2021 10:32:31 | critical | No Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0; |
13/10/2021 10:23:53 | critical | Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0; |
13/10/2021 10:21:46 | Warning! | Lost MDD Timeout;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0; |
13/10/2021 10:21:43 | critical | SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0; |
13/10/2021 10:21:43 | Warning! | RCS Partial Service;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0; |
13/10/2021 10:21:43 | critical | SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0; |
13/10/2021 10:21:42 | Warning! | RCS Partial Service;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0; |
12/10/2021 08:39:15 | Error | DHCP RENEW WARNING - Field invalid in response v4 option;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0; |
10/10/2021 05:59:12 | critical | No Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0; |
08/10/2021 20:39:14 | Error | DHCP RENEW WARNING - Field invalid in response v4 option;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0; |
05/10/2021 21:24:51 | critical | No Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0; |
05/10/2021 08:39:14 | Error | DHCP RENEW WARNING - Field invalid in response v4 option;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0; |
03/10/2021 21:07:55 | critical | No Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0; |
01/10/2021 20:39:14 | Error | DHCP RENEW WARNING - Field invalid in response v4 option;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0; |
29/09/2021 14:37:49 | critical | No Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0; |
21/09/2021 08:39:12 | Error | DHCP RENEW WARNING - Field invalid in response v4 option;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0; |
Another note:
I've noticed the QAM drops on both channels 1 + 3 currently,
However I do have some historical screenshots of other channels also dropping if required.
An example of pinging bbc.co.uk, whilst playing a video in the background:
This also occurs on Discord,
League of Legends(more noticeable here) - ping will raise from mid 20's, up to sometimes over 100. - even if the TBB graph doesn't directly reflect it.
and whatever else I may be using at the time.
Anything else needed, I can try to provide.
on 15-10-2021 14:34
on 15-10-2021 19:25
Hi jbrennand, firstly - thank you for your reply. 🙂
Secondly, sorry for my delay in replying - busy day n'that!
Well, one positive so far - I managed to sort the random ping while watching videos issue.
That was some ethernet port funkyness,
Did some testing with wired/wireless devices and only managed to replicate it from this PC, so ended up doing the most advanced technique of "Turning it off and on". - makes a nice change from my usual troubleshooting.
On to the next thing:
Although I am currently unable to restart (due to people currently using the connection)
Previously to this time, after a normal restart, including pinhole resets/5 minute power downs - the Post-RS count will never climb.
Much like it hasn't since the Partial service in my OP.
They only ever climb when the Partial services happen.
However, even after restarts in the past I will still see channels dropping in/out of 64QAM. - including now.
Upstream bonded channels
Channel Frequency (Hz) Power (dBmV) Symbol Rate (ksps) Modulation Channel ID
1 | 46200346 | 39 | 5120 | 64 qam | 1 |
2 | 39400000 | 38.8 | 5120 | 64 qam | 2 |
3 | 32600034 | 38.5 | 5120 | 64 qam | 3 |
4 | 25800000 | 37.8 | 5120 | 32 qam | 4 |
Upstream bonded channels
Channel Channel Type T1 Timeouts T2 Timeouts T3 Timeouts T4 Timeouts
1 | ATDMA | 0 | 0 | 6 | 0 |
2 | ATDMA | 0 | 0 | 0 | 0 |
3 | ATDMA | 0 | 0 | 0 | 0 |
4 | ATDMA | 0 | 0 | 1 | 0 |
The T3's currently are very limited as you can see,
only one since the outage.
However I do notice when they happen it's always in bursts of multiple on each channel - I'll have evidence of this with the week or so .
It's not a constant thing.
it's very intermitent.
In regards to the connections, I've made sure they're all finger tight,
I've also made sure there are no unterminated lose ends and such, I made 100% sure of this before my original post, I should have stated that. - I'm getting a tad more forgetful each year! 🙂
I've been actually wondering if it's someone else at the root cause of the potential noise(although very intermitent, as i keep saying. aha).
Since If someone else in the street were to have a unterminated cable or other such noice introducing issue(Their own non VM approved cable as example?) it could well bring the issue to me too, correct?
I guess it's worth mentioning:
when technicians have been here before for other reasons, they've never noticed any issues down in the cabinet, they've replaced the cabling outside/inside the boxes to the house too.
Even after these visits these QAM drops and such have still been a thing.
Maybe I'm looking too far into the "noise" stuff, but I'd obviously rather look into it before it potentially could get worse.
on 15-10-2021 20:21
15-10-2021 21:42 - edited 15-10-2021 21:42
Yeah, I figured it would need a tech due to the drops. - just didn't want to seem too pushy with outright requesting it! aha
Nothing showing on the fault checker, however we know how that is! 🙂
Thank you for the confirmation, Roger. 🙂
on 18-10-2021 08:52
Hi Icantcrabhere
Thanks for posting. I'll be able to book you a tech in as per the community's advice. I'll PM you now to assist further.
Best,
Need a helpful hand to show you how to make a payment? Check out our guide - How to pay my Virgin Media bill
on 18-10-2021 13:38
Hi John!
I have replied to the PM, thank you! 🙂
Just posting these here from today, for my own records
Upstream bonded channels
Channel Frequency (Hz) Power (dBmV) Symbol Rate (ksps) Modulation Channel ID
1 | 46200000 | 39 | 5120 | 64 qam | 1 |
2 | 39400088 | 38.8 | 5120 | 64 qam | 2 |
3 | 32600170 | 38.5 | 5120 | 16 qam | 3 |
4 | 25800268 | 37.8 | 5120 | 32 qam | 4 |
on 18-10-2021 13:42
Thanks for joining me on PM.
Just to update the thread, the engineer visit has been booked in.
This can be tracked and altered in your online account
Let us know how the visit goes.
Best,
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on 18-10-2021 14:51
If you follow the previous message 🙂 you'll be able to go into the online account and change the visit 🙂
Best,
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