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Packet Loss / Lag Spikes

NoxiousDevil
Tuning in

Hello,

Hoping some folks can shed some light as to why I'm getting frequent packet loss with Virgin. My broadband speed is 1Gig - superhub 4 connected in modem mode with an Asus Tuf AX5400 router (via ethernet). Have tried factory resetting both the superhub and the Asus router as well as running the superhub in normal mode but still no luck for me 😞 

Edit!! I have also noticed in my logs im getting quite a few Event type code 24 errors as well

 

Channel Frequency (Hz) Power (dBmV) SNR (dB) Modulation Channel ID

253310000009.339QAM25625
113900000010.338.6QAM2561
21470000001038.6QAM2562
31550000009.940.4QAM2563
41630000009.839QAM2564
51710000009.639QAM2565
61790000009.940.4QAM2566
71870000001040.4QAM2567
81950000009.840.4QAM2568
92030000009.540.4QAM2569
102110000009.140.4QAM25610
112190000008.739QAM25611
122270000008.639QAM25612
132350000008.438.6QAM25613
142430000008.239QAM25614
15251000000839QAM25615
162590000008.539QAM25616
172670000008.639QAM25617
18275000000939QAM25618
192830000009.339QAM25619
202910000001039QAM25620
2129900000010.939QAM25621
2230700000011.139QAM25622
2331500000010.739QAM25623
243230000009.739QAM25624
263390000009.539QAM25626
2734700000010.240.4QAM25627
2835500000010.439QAM25628
2936300000010.539QAM25629
3037100000010.239QAM25630
313790000009.838.6QAM25631



3.0 Downstream channels

Channel Lock Status RxMER (dB) Pre RS Errors Post RS Errors

25Locked38.98326100
1Locked38.60537700
2Locked38.60537700
3Locked40.36628700
4Locked38.98326100
5Locked38.98326100
6Locked40.36628700
7Locked40.36628700
8Locked40.36628700
9Locked40.36628700
10Locked40.36628700
11Locked38.98326100
12Locked38.98326100
13Locked38.60537700
14Locked38.98326100
15Locked38.98326100
16Locked38.98326100
17Locked38.98326100
18Locked38.98326100
19Locked38.98326100
20Locked38.98326100
21Locked38.98326100
22Locked38.98326100
23Locked38.98326100
24Locked38.98326100
26Locked38.98326100
27Locked40.36628700
28Locked38.98326100
29Locked38.98326100
30Locked38.98326100
31Locked38.60537700



3.1 Downstream channels

Channel Channel Width (MHz) FFT Type Number of Active Subcarriers Modulation (Active Profile) First Active Subcarrier (Hz)
159964K1840QAM4096759


3.1 Downstream channels

Channel ID Lock Status RxMER Data (dB) PLC Power (dBmV) Correcteds (Active Profile) Uncorrectables (Active Profile)
159Locked417.691184254

39

8 REPLIES 8

NoxiousDevil
Tuning in

Channel Frequency (Hz) Power (dBmV) Symbol Rate (ksps) Modulation Channel ID

13660000039.55120 KSym/secQAM6411
223600000395120 KSym/secQAM6413
330100000395120 KSym/secQAM6412
443100000405120 KSym/secQAM6410
54960000040.35120 KSym/secQAM649



3.0 Upstream channels

Channel Channel Type T1 Timeouts T2 Timeouts T3 Timeouts T4 Timeouts

1ATDMA0000
2ATDMA0000
3ATDMA0000
4ATDMA0000
5ATDMA0000



3.1 Upstream channels

Channel Channel Width (MHz) Power (dBmV) FFT Type Modulation
1410.036.52KQAM32


3.1 Upstream channels

Channel Channel Type Number of Active Subcarriers First Active Subcarrier (Hz) T3 Timeouts T4 Timeouts
14OFDMA20053.900

Wed 03/05/2023
20:40:50
6US profile assignment change. US Chan ID: 14; Previous Profile: 11; New Profile: 12.;CM-MAC=;CMTS-MAC=CM-QOS=1.1;CM-VER=3.1;
Wed 03/05/2023
20:33:31
6

CM-STATUS message sent. Event Type Code: 24; 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;

setup a BQM

Broadband Quality Monitor | thinkbroadband

run a CMD

ping -t 194.168.4.100

press CTRL + pause to get updates

---------------------------------------------------------------

Adduxi
Very Insightful Person
Very Insightful Person

Your Downstream power levels are too high on some channels.  They should be between -6 and +10, ideally closer to 0.  If the Upstream channels are constantly changing profiles, that's not ideal either.   

You need to get a VM technician to lower the power levels to the Hub.

I'm a Very Insightful Person, I'm here to share knowledge, I don't work for Virgin Media. Learn more

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I had a feeling they were too high, I've also noticed the upstream 3.1 QAM keeps changing quite frequently, upon rebooting the hub 4 it goes to 128QAM then 5 mins later drops to 32QAM. This results in games producing high ping spikes sometimes up to 500ms for a few seconds then goes back to normal 30ms.

Edit: just checked on superhub and the upstream 3.1 qam is now QAM8!

I set up a bqm as you requested and here are the results as of yet! Obvious signs of issues

Screenshot 2023-05-04 110011.png

Client62
Hero

The DS 3.1 Channel looks quite suspect, over 91 Million Pre RS errors are logged but by only 39 Post RS errors.

Either the error correction is Absolutely Fabulous or more plausible, Post RS errors are grossly under reported.

 

Had loads of disconnections today, thankfully went onto live chat and they're sending a technician round this Saturday to sort the power levels and other issues I have had 🙂