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Kingslayer71
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Very low upload speed and possible low upstream power

I've just returned from a week's holiday during which time there seems to have been a power cut in our area and this always seems to play havoc with my VM broadband. Yesterday evening it seemed okay but this morning I'm seeing very strange behaviour that I haven't seen before. I have gone through the usual steps of switching off the Hub 3 (which I run in modem mode), leaving it 5 mins and then switching back on. Having done this several times, the download speed is a bit wobbly but generally seems about normal again (around 350-380 Mbps). However, the upload speed is pretty much unusable at 0.45 Mbps when it's usually around 35 Mbps. Having looked elsewhere on these forums it seems like the upstream power for the 4 channels should be around 35-40 dBmV but mine are only showing around 4 dBmV.

Upstream bonded channels

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

1393999594.05512064 qam6
2258005384.175512064 qam8
3325991304.075512064 qam7
4462001754.1512064 qam5

 

My downstream power levels seem okay (around 2-6 dBmV)

Downstream bonded channels

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

15942500003.437256 qam24
2458250000437256 qam7
34662500004.137256 qam8
4474250000437256 qam9
54822500004.337256 qam10
64902500004.337256 qam11
74982500004.137256 qam12
85062500003.737256 qam13
95142500002.437256 qam14
105222500001.436256 qam15
115302500002.537256 qam16
125382500004.137256 qam17
135462500003.937256 qam18
145542500003.437256 qam19
155622500003.237256 qam20
16570250000337256 qam21
17578250000337256 qam22
185862500003.237256 qam23
19658250000637256 qam25
20666250000637256 qam26
21674250000637256 qam27
22682250000638256 qam28
236902500005.537256 qam29
246982500004.937256 qam30

 

The VM service status is not showing any faults in my area, but a couple of times when I have run a test on while logged into my.virginmedia.com it has come up saying something about network interference affecting a number of customers in my area. Other times when I run the test it says everything is fine. Something clearly isn't right - can anyone shed any light please? Trying to work from home with flaky broadband is extremely frustrating!

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Anonymous
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Re: Very low upload speed and possible low upstream power

The HUB 3 reports power a decimal out your power levels are actually ok.

I think you need to create a BQM here so we can see the quality of the line.

Kingslayer71
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Re: Very low upload speed and possible low upstream power

Thanks Carl. It eventually transpired that there was a Virgin Media network problem in my area (which is now fixed). Upload speeds are back to normal so that seems to have sorted it. Out of interest, I created a BQM as you suggested. Not sure what 'good' looks like TBH but here's the report for the last 24 hours. Let me know if anything looks amiss!

BQM.png

 

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Anonymous
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Re: Very low upload speed and possible low upstream power


@Kingslayer71 wrote:

Thanks Carl. It eventually transpired that there was a Virgin Media network problem in my area (which is now fixed). Upload speeds are back to normal so that seems to have sorted it. Out of interest, I created a BQM as you suggested. Not sure what 'good' looks like TBH but here's the report for the last 24 hours. Let me know if anything looks amiss!

BQM.png

 


The really tiny red areas at the top are packet (Data) loss.

The yellow spikes are where your latency increases (How long it takes for your HUB to respond).

It doesn't look too bad to be honest, certainly nothing to be concerned about.

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