BT Infinity VDSL worse performance than ADSL

[chrisjp]

I have just 'upgraded' from BT ADSL to BT infinity VDSL - and I wish I hadn't! 

With ADSL I routinely achieved around 14-15Mbps download speeds; upload speeds were much lower at around 1 -2Mbps but this was sufficient for my needs. Having moved to BT Infinity VDSL I'm only getting atround 10-11 Mbps download, although upload speeds are around 20Mbps. On speed testing with Ookla, download speeds start instantly at around 50Mbps but then immediately deteriorate to around 10Mbps. Worse, I use a TP Link Powerline adapter and, with ADSL this always gave me acceptable speeds of around 7Mbps. Now with VDSL the Powerline only gives me 1-2Mbps download and also often causes the router to drop its broadband connection. Again upload speeds are higher. I've tried both the BTHub 6 and a TP-Link VR-2800 modem-router - with the same results from each.

Is there anything that can be done to improve matters? Is it possible to get BT to put my connection back to ADSL? 

[Keith_Beddoe]

In order to find out what services and speed range you should be getting, please enter your phone number into this form.
Broadband availability checker


Please remember to edit out your phone number before you post the results.

Regarding the powerline adapters, see

Interference to broadband caused by powerline adapers or broadband extenders

Which router are you using at the moment?

The frequency range that VDSL uses, is less tolerant of any poor internal wiring.

[chrisjp]

Here is the result of the service availability checker

I'm currently using a TP link VR 2800 modem-router and a TP-Link TL-WPA8630P Poerline adapter. These always worked well with the BT ADSL service. I've changed nothing except to 'upgrade' to VDSL. 

My VDSL service is fibre to the cabinet.

Can anyone tell me whether BT allows reversion to ADSL from VDSL?

[Keith_Beddoe]

You should be getting the maximum speed for your contract, is it Infinity 1 or Infinity 2.

What connection speed does your VR 2800 show?

Could you please post the results from the BT Wholesale speed checker, including the further diagnostics.
 
 BT Wholesale Speedtester
 

Can you do this please, with the powerline adapters unplugged from the mains?

Thanks

[Keith_Beddoe]

Also see https://community.bt.com/t5/Connected-Devices-Other/My-Powerline-adapters-slow-down-when-downstream-...

[chrisjp]

Thank you for these swift responses. I unplugged my Powerline adapters and immediately achieved 50Mbps download speed and around 20Mbps upload. But plugging the master powerline adapter into any power socket within reasonable reach of my modem-router immediately caused a degradation to 10-20Mbps download (though not to upload).

This is a bit of a problem for me, as Wifi from my modem-router does not reach the whole ground floor of my house and I have used powerline adapters to provide a stronger WiFi signal in my lounge & dining room - and also provide ethernet connections to my TV and Freeview box.

These worked fine with ADSL but clearly the frequency clash makes powerline adapters pretty much unusable with VDSL.  Are there any workarounds that anyone knows of?  Alternatively, does BT accept a reversion to ADSL immediately after I have accepted an 18 month contract for VDSL?

[gg30340]

Depending on the type/age of your powerline adaptors it might be worth trying a different pair. If you don't see an improvement you could always take them back to the shop.

[Keith_Beddoe]

Different powerline adapters would probably help, as I suspect its the TP Link ones causing the issue.

I use  some of the original BT ones, but I do have a couple of TP Links ones that I stopped using, as they interfered with my ADSL connection.

BT do some,  that do not cause interference, my daughter uses them in her house, with no issues.

BT Mini Wi-Fi 600 Home Hotspot Powerline Adapter Kit - White, Pack of 3

You can get them cheaper on Amazon.

Do you have a BT YouView box?

How many adapters are you using at the moment? There should only ever be one connected to the home hub.

[Keith_Beddoe]

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@gg30340 wrote:

Depending on the type/age of your powerline adaptors it might be worth trying a different pair. If you don't see an improvement you could always take them back to the shop.

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@gg30340 I notice that on that other thread, it was TP Link adapters causing the problem.

They must generate an awful lot of radio interference

[gg30340]

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@Keith_Beddoe wrote:

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@gg30340 I notice that on that other thread, it was TP Link adapters causing the problem.

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It might be something to do with the way they filter out the electrical impulses for ADSL being different for VDSL that causes greater loss of the VDSL signal.