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milmber
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Slow speeds/latency on M350

Hi,

I am seeing slow speeds and latency on my M350 package - especially during the day. Running on a Hub 4 in modem mode with my own wifi router.

Below is my BQM for 18/01/2021 - 

https://www.thinkbroadband.com/broadband/monitoring/quality/share/336052879895d95c9f1f270ef4c2fcb686eb7477-18-01-2021

336052879895d95c9f1f270ef4c2fcb686eb7477-18-01-2021

Upload and download speeds from thinkbroadband.com
 
1611011230695495355-graph.png
 
DateDown HTTPx6Down HTTPx1Upstream
Mon 18/01/2021 23:0784.54 Mbps47.48 Mbps13.56 Mbps
Sat 16/01/2021 10:45196.05 Mbps120.57 Mbps21.03 Mbps
Sat 16/01/2021 10:34220.50 Mbps212.31 Mbps34.98 Mbps
Sat 16/01/2021 00:2046.77 Mbps23.77 Mbps22.95 Mbps
Tue 12/01/2021 21:35121.37 Mbps149.40 Mbps21.54 Mbps
Mon 11/01/2021 09:3734.97 Mbps32.21 Mbps0.25 Mbps
Mon 11/01/2021 09:36111.82 Mbps87.13 Mbps2.67 Mbps
Sun 10/01/2021 15:3697.76 Mbps88.49 Mbps12.06 Mbps
Sun 10/01/2021 10:06149.47 Mbps145.66 Mbps24.88 Mbps
Sun 10/01/2021 10:01272.77 Mbps205.91 Mbps21.23 Mbps
Sun 10/01/2021 09:59173.26 Mbps235.99 Mbps31.29 Mbps
Sun 10/01/2021 09:58251.66 Mbps225.41 Mbps28.64 Mbps
Sun 10/01/2021 09:5559.35 Mbps76.19 Mbps28.79 Mbps
Sat 09/01/2021 19:3390.69 Mbps45.23 Mbps16.19 Mbps
Sat 09/01/2021 19:0942.40 Mbps30.20 Mbps15.21 Mbps
Sat 09/01/2021 16:5834.75 Mbps39.53 Mbps3.04 Mbps
Sat 09/01/2021 15:4397.37 Mbps78.53 Mbps9.98 Mbps
Sat 09/01/2021 15:1889.16 Mbps103.77 Mbps18.22 Mbps
Sat 09/01/2021 14:5873.94 Mbps67.61 Mbps16.23 Mbps
Sat 09/01/2021 09:39133.41 Mbps116.82 Mbps1.02 Mbps
Sat 09/01/2021 09:3869.90 Mbps97.38 Mbps0.31 Mbps
Fri 08/01/2021 18:2744.65 Mbps39.43 Mbps4.27 Mbps
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milmber
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Re: Slow speeds/latency on M350

Below is my router status.

3.0 Downstream channels

ChannelFrequency (Hz)Power (dBmV)SNR (dB)ModulationChannel ID
304027500006.740.4QAM25630
113875000010.440.4QAM2561
214675000010.340.4QAM2562
31547500009.839QAM2563
4162750000939QAM2564
51707500008.440.4QAM2565
61787500008.440.4QAM2566
71867500008.240.4QAM2567
81947500008.240.4QAM2568
92027500008.340.4QAM2569
102107500008.240.4QAM25610
112187500007.840.4QAM25611
122267500007.940.4QAM25612
132347500008.240.4QAM25613
142427500008.240.4QAM25614
152507500008.240.4QAM25615
162587500008.640.4QAM25616
172667500008.740.4QAM25617
182747500007.640.4QAM25618
192827500007.640.4QAM25619
202907500007.740.9QAM25620
212987500008.240.4QAM25621
223067500008.440.4QAM25622
233147500008.740.4QAM25623
243227500008.740.4QAM25624
25330750000840.4QAM25625
263707500007.240.4QAM25626
273787500007.140.4QAM25627
283867500007.140.9QAM25628
293947500007.138.6QAM25629
314107500006.840.4QAM25631



3.0 Downstream channels

ChannelLock StatusRxMER (dB)Pre RS Errors Post RS Errors
30Locked40.36628700
1Locked40.36628700
2Locked40.36628700
3Locked38.98326100
4Locked38.98326100
5Locked40.36628700
6Locked40.36628700
7Locked40.36628700
8Locked40.36628700
9Locked40.36628700
10Locked40.36628700
11Locked40.36628700
12Locked40.36628700
13Locked40.36628700
14Locked40.36628700
15Locked40.36628700
16Locked40.36628700
17Locked40.36628700
18Locked40.36628700
19Locked40.36628700
20Locked40.94620900
21Locked40.36628700
22Locked40.36628700
23Locked40.36628700
24Locked40.36628700
25Locked40.36628700
26Locked40.36628700
27Locked40.36628700
28Locked40.94620900
29Locked38.60537700
31Locked40.36628700

 

3.1 Downstream channels   
ChannelChannel Width (MHz)FFT TypeNumber of Active SubcarriersModulation (Active Profile) First Active Subcarrier (Hz)
33784K1520QAM4096424


3.1 Downstream channels     
Channel IDLock StatusRxMER Data (dB)PLC Power (dBmV)Correcteds (Active Profile)Uncorrectables (Active Profile)
33Locked426.1245028140711592

 

3.0 Upstream channels

ChannelFrequency (Hz)Power (dBmV)Symbol Rate (ksps)ModulationChannel ID
132600000395120 KSym/sec64QAM5
246200000405120 KSym/sec64QAM3
33940000039.55120 KSym/sec64QAM4
42580000038.35120 KSym/sec64QAM6


3.0 Upstream channels

ChannelChannel TypeT1 TimeoutsT2 Timeouts  T3 TimeoutsT4 Timeouts
1US_TYPE_STDMA0000
2US_TYPE_STDMA0000
3US_TYPE_STDMA0010
4US_TYPE_STDMA0010
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Andruser
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Re: Slow speeds/latency on M350

Hub status data is mostly excellent - there's a couple of channels over 10 dBmV, but only fractionally and I wouldn't see that as causing problems.

The BQM however shows a typical over-utilisation pattern - you see how it's very poor during normal waking hours, and then peachy from about half past midnight to 9 am? Shows that the network and your hub are working perfectly when there isn't too much traffic. As you've got a Hub 4 on an M350 connection, that suggests that there's been a utilisation problem there for a while?

The Hub 4 and DOCSIS 3.1 are supposed to help with over-utilisation, but as far as I can tell, that's en masse, not at an individual connection level, what's more the benefits are moderate (around 15% additional bandwidth) and I suspect won't help with upstream issues.  Looking at the BQM's shape, I'd hazard a guess that the dominant utilisation issue around you is daytime working from home that puts most pressure on the upstream.

There's a good chance that this is Covid related so it might go away as and when we get back to some form of normal, so give that some thought.  The alternative is to invoke the VM speed guarantee, as you have speeds that regularly fall below the minimum.  Doing that gives the company 30 days to fix the issue, or to release you from contract without penalty (which may or may not be an outcome you want).  If invoking the speed guarantee, read up on the policy and the small print.  In essence you need to show that on at least one occasion on three consecutive days the speed was below 181 Mbps. 

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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Re: Slow speeds/latency on M350

Thank you. Very useful analysis. Virgin is the only fibre provider where I live. I will wait for that to change.
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