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Kath_F
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Message 11 of 35
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Re: Intermittent slow speeds (~0.5Mbps) for 30s, Modem Mode, Normally 300Mbps+

Hi XDGFX, 

Thanks for your post and for coming back to us with an update on things. 

I have checked things this morning and can see the area fault has since been resolved so this is no longer affecting you. 

It looks as though there are some errors logged and the power levels need some adjusting. I would like to arrange for an engineer to come to take a look at this for you. 


I just need to confirm the address to ensure we are booking the visit on the correct account. I have sent you a private message regarding this. Just click on the little plum envelope at the top right hand side of the page to access your inbox.


Thanks,

Kath_F
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Kath_F
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Message 12 of 35
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Re: Intermittent slow speeds (~0.5Mbps) for 30s, Modem Mode, Normally 300Mbps+

Hi XDGFX,

 
Thanks for coming back to via private message. 


I have booked you in for the next available appointment. We cannot confirm the appointment time slot, so to view this please sign in to My Virgin Media here: My VM Just go to My Account > Track your orders.


If the appointment is unsuitable or if anyone living at your property has tested positive for Coronavirus, has been asked to self-isolate or has flu-like symptoms then please reschedule the appointment on the same link. 


Lets us know how the appointment goes. 


Take care.

Kath_F
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XDGFX
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Message 13 of 35
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Re: Intermittent slow speeds (~0.5Mbps) for 30s, Modem Mode, Normally 300Mbps+

Hi again,

The engineer came and added an attenuator to fix the power levels. I've checked a few times and power levels seem to stay within spec. For the most part, the big slowdowns have been fixed, however there are still occasional slowdowns (recently to between 10Mbps and 100Mbps).

This test was taken today at 4pm

XDGFX@Australia:~$ speedtest-cli --no-pre-allocate 
Retrieving speedtest.net configuration...
Testing from Virgin Media (XX.XXX.XX.XXX)...
Retrieving speedtest.net server list...
Selecting best server based on ping...
Hosted by Iomart (Maidenhead) [46.22 km]: 41.517 ms
Testing download speed................................................................................
Download: 97.94 Mbit/s
Testing upload speed................................................................................................
Upload: 20.09 Mbit/s

The power levels are within spec for both upstream and downstream. The speedtest was performed on the Edgerouter, connected directly to the VM hub in modem mode.

Maybe the power levels were only part of the problem, but there is a fault elsewhere?

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XDGFX
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Message 14 of 35
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Re: Intermittent slow speeds (~0.5Mbps) for 30s, Modem Mode, Normally 300Mbps+

Also, the BQM I set up seems rather spikey - this could be another indication of issues?

Below is the current monitor for reference:

XDGFX_0-1629817495445.png

---

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Kath_F
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Message 15 of 35
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Re: Intermittent slow speeds (~0.5Mbps) for 30s, Modem Mode, Normally 300Mbps+

Hi XDGFX, 

Thanks for your update and apologies that you are having continued issues. 

Taking a look at the account all is looking good. Can you please try re-running the speedtest connecting the Hub directly to the Laptop or PC? This will allow us to rule out a third party router issue. Make sure you turn the Hub off, disconnect the router and connect to the PC or Laptop before turning the hub back on.

You'll also need to ensure the network card on the OC or Laptop is 1GB and that the ethernet cable is cat 6e minimum. 

Pop back here with your results. 

Thanks,

Kath_F
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XDGFX
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Message 16 of 35
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Re: Intermittent slow speeds (~0.5Mbps) for 30s, Modem Mode, Normally 300Mbps+

Hi Kath,

I'm running the speedtests on a Ubiquity EdgeRouter X. Although this device can act like a router, it is actually just a Linux computer running Debian. I'm running commands on it directly though ssh. It is connected directly to the VM hub through a required POE injector.

If the VM hub is capable of running a speed test I am open to try that, but otherwise I'm as close to the network entrypoint as possible.

I was confused for a bit about your next statement - I assume you mean ensure it supports gigabit? 😅 The ERX does indeed support up to 1Gbps. I'm currently using cat5e cable, which should support 1000BASE-T. If there's a known issue with this protocol and VM routers I'm happy to try a higher category cable, although I've never had an issue with gigabit speeds and cat5e before.

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Natalie_L
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Message 17 of 35
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Re: Intermittent slow speeds (~0.5Mbps) for 30s, Modem Mode, Normally 300Mbps+

Thank you for your reply XDGFX. 

 

We have had another check from our side to ensure that no issues have developed since our message and can confirm everything is still running within spec from here. 

 

If possible, are you able to connect a Cat 6E? 

 

Thanks 

 

Nat
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XDGFX
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Message 18 of 35
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Re: Intermittent slow speeds (~0.5Mbps) for 30s, Modem Mode, Normally 300Mbps+

Hi Nat,

I don't have any Cat 6e available at the moment, I've switched it for Cat 7 and will see if that makes a difference.

Thanks
Callum

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XDGFX
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Message 19 of 35
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Re: Intermittent slow speeds (~0.5Mbps) for 30s, Modem Mode, Normally 300Mbps+

Nope, Cat 7 doesn't seem to have helped.

If it's any help I've been keeping an eye on my BQM, and the slowdowns seem to correspond with spikes on the graph.

3da211383ccfdaa73450a8a9c0cc4860bcc1991f.png

Latency does seem to be the biggest issue - I measure download speed at about 100mbps as mentioned, however it can often take several seconds to load any webpage during this time as it seems to be taking a long time to connect to each domain.

Any other tips I can try? Maybe the VM hub is faulty? Is it possible to perform speed tests or allow BQM pings from the VM router in modem mode, so I can further rule out other equipment?

Many thanks
Callum

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XDGFX
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Message 20 of 35
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Re: Intermittent slow speeds (~0.5Mbps) for 30s, Modem Mode, Normally 300Mbps+

An example of what I've described above; some of the thumbnails on the YouTube homepage are taking several seconds to load, even though the filesizes are tiny (kB)

firefox slow loading of images.png

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