on 09-04-2022 11:11
Another day of hell with Virgin Media broadband...
I can usually benefit 900MB+ of my connection until it caps at 60-70MB with heavy packet loss. Only a reboot of the modem allows to go back to acceptable level of connection speed. This happen at least once a week.
On top of which my connection will drop intermittently for microseconds, sometimes dropping for few minutes before to come back. This happen almost every day on certain period. Random days, random times, so no indication this is related to network congestion.
All lights green in internal network, only degradation is between modem and ISP.
Time Priority Description
Sat Apr 2 16:59:14 2022 | 3 | No Ranging Response received - T3 time-out;CM-MAC=*:*:*:*:*:*;CMTS-MAC=*:*:*:*:*:*;CM-QOS=1.1;CM-VER=3.1; |
Sun Apr 3 03:57:21 2022 | 4 | DHCP RENEW WARNING - Field invalid in response v4 option;CM-MAC=*:*:*:*:*:*;CMTS-MAC=*:*:*:*:*:*;CM-QOS=1.1;CM-VER=3.1; |
Sun Apr 3 03:57:21 2022 | 6 | DHCP Renew - lease parameters tftp file-cmreg-vmdg640-bbt076-b.cm modified;CM-MAC=*:*:*:*:*:*;CMTS-MAC=*:*:*:*:*:*;CM-QOS=1.1;CM-VER=3.1; |
Sun Apr 3 22:48:02 2022 | 3 | No Ranging Response received - T3 time-out;CM-MAC=*:*:*:*:*:*;CMTS-MAC=*:*:*:*:*:*;CM-QOS=1.1;CM-VER=3.1; |
Wed Apr 6 04:00:33 2022 | 4 | DHCP RENEW WARNING - Field invalid in response v4 option;CM-MAC=*:*:*:*:*:*;CMTS-MAC=*:*:*:*:*:*;CM-QOS=1.1;CM-VER=3.1; |
Wed Apr 6 04:00:33 2022 | 6 | DHCP Renew - lease parameters tftp file-cmreg-vmdg640-bbt076-b.cm modified;CM-MAC=*:*:*:*:*:*;CMTS-MAC=*:*:*:*:*:*;CM-QOS=1.1;CM-VER=3.1; |
Wed Apr 6 07:19:52 2022 | 5 | MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1;CM-MAC=*:*:*:*:*:*;CMTS-MAC=*:*:*:*:*:*;CM-QOS=1.1;CM-VER=3.1; |
Sat Apr 9 07:40:36 2022 | 3 | No Ranging Response received - T3 time-out;CM-MAC=*:*:*:*:*:*;CMTS-MAC=*:*:*:*:*:*;CM-QOS=1.1;CM-VER=3.1; |
Sat Apr 9 07:57:41 2022 | 5 | MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1;CM-MAC=*:*:*:*:*:*;CMTS-MAC=*:*:*:*:*:*;CM-QOS=1.1;CM-VER=3.1; |
09-04-2022 11:44 - edited 09-04-2022 11:44
For a full diagnosis you'll need to post the upstream and downstream data, but the BQM shows severe packet loss which would explain the results you are getting.
There is a possibility that this could be caused by something as simple as a loose coax connector, so do check that they are all tight. Otherwise it's going to need a technician visit to find the fault.
on 09-04-2022 12:03
Agree with the above. Just to add the earlier latency spike last night on the BQM appears to have been widespread.
on 09-04-2022 18:26
Sadly the original post would not allow me to post Downstream and Upstream because of the limit of characters...
I have already checked coaxial and agree was worth a try. As seen on BMQ, I have got chronic packet loss.
Downstream
Channel Frequency (Hz) Power (dBmV) SNR (dB) Modulation Channel ID
1 | 411000000 | 11.500000 | 40.366287 | QAM256 | 1 |
2 | 419000000 | 11.199997 | 40.946209 | QAM256 | 2 |
3 | 427000000 | 10.599998 | 40.366287 | QAM256 | 3 |
4 | 435000000 | 10.099998 | 40.366287 | QAM256 | 4 |
5 | 443000000 | 10.400002 | 40.366287 | QAM256 | 5 |
6 | 451000000 | 10.699997 | 40.946209 | QAM256 | 6 |
7 | 459000000 | 10.599998 | 40.946209 | QAM256 | 7 |
8 | 467000000 | 10.699997 | 40.946209 | QAM256 | 8 |
9 | 475000000 | 10.300003 | 40.366287 | QAM256 | 9 |
10 | 483000000 | 10.599998 | 40.366287 | QAM256 | 10 |
11 | 491000000 | 10.599998 | 40.366287 | QAM256 | 11 |
12 | 499000000 | 10.199997 | 40.366287 | QAM256 | 12 |
13 | 507000000 | 9.699997 | 40.366287 | QAM256 | 13 |
14 | 515000000 | 10.000000 | 40.946209 | QAM256 | 14 |
15 | 523000000 | 10.400002 | 40.946209 | QAM256 | 15 |
16 | 531000000 | 10.099998 | 40.946209 | QAM256 | 16 |
17 | 539000000 | 9.500000 | 40.946209 | QAM256 | 17 |
18 | 547000000 | 9.500000 | 40.366287 | QAM256 | 18 |
19 | 555000000 | 10.099998 | 40.366287 | QAM256 | 19 |
20 | 563000000 | 10.500000 | 40.946209 | QAM256 | 20 |
21 | 571000000 | 10.400002 | 40.946209 | QAM256 | 21 |
22 | 579000000 | 10.000000 | 40.366287 | QAM256 | 22 |
23 | 587000000 | 10.000000 | 40.946209 | QAM256 | 23 |
24 | 595000000 | 10.699997 | 40.366287 | QAM256 | 24 |
25 | 603000000 | 10.400002 | 40.366287 | QAM256 | 25 |
26 | 611000000 | 9.900002 | 40.366287 | QAM256 | 26 |
27 | 619000000 | 9.900002 | 40.366287 | QAM256 | 27 |
28 | 627000000 | 10.000000 | 40.366287 | QAM256 | 28 |
29 | 635000000 | 9.500000 | 40.366287 | QAM256 | 29 |
30 | 643000000 | 8.599998 | 38.983261 | QAM256 | 30 |
31 | 651000000 | 8.699997 | 38.605377 | QAM256 | 31 |
Upstream
Channel Frequency (Hz) Power (dBmV) Symbol Rate (ksps) Modulation Channel ID
1 | 39400000 | 37.270599 | 5120 KSym/sec | 64QAM | 4 |
2 | 25800000 | 35.270599 | 5120 KSym/sec | 64QAM | 6 |
3 | 32600000 | 36.270599 | 5120 KSym/sec | 64QAM | 5 |
4 | 46200000 | 37.770599 | 5120 KSym/sec | 64QAM | 3 |
09-04-2022 18:38 - edited 09-04-2022 18:38
Those two peaks currently on the BQM are a widespread issue. I have them too. It's the solid red that will be causing the main problem. Does that recur on the BQM ?
Your signal levels are OK. The downstream is a fraction over the specified peak but that's not going to knock you out.
on 09-04-2022 23:19
18 out of 32 downstream power levels are out of spec and this is often indicative of your problem. You need a technician’s visit to adjust those power levels.
Call Customer Services on 0345 454 1111/150 if you have a VM landline or wait a day or two for a VM staff member to get to your post.
on 10-04-2022 07:33
Thanks Tudor for the insight. I will wait for a staff member to come back on this as I am a broadband only customer.
BTW, care to explain the out of spec portion of your analysis?
I would love to understand better those readings and so far I have not been able to find much informations about signal modulation for Cable connections. Would be great if you can go into more details or link some literature about it. I have been through electronic A levels before to go into computing science and I am from a pre Internet era, when we never touched these subjects in details.
on 10-04-2022 07:36
on 12-04-2022 08:22
Hi @badrogh thanks for your post here in the community although I'm sorry to hear of your concerns raised.
I have ran the diagnostics on your network and I can too see that your power levels are out of specifications which will be causing the issues you're having.
We'll need to arrange a technician to get this sorted for you, so please expect a PM to arrive shortly and respond when you can!
Many thanks
on 12-04-2022 09:02
About "I can too see that your power levels are out of specifications".... can I understand what are the expected levels? What is out of specs? How can this be diagnosed? Is there any documentation on the values expected on those type of cable modem?