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Beginner
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Message 1 of 4

Slower speeds on ethernet through powerline

Hello,

I've recently been experiencing slower speeds on my computer that is connected with ethernet through a powerline.

Previously I was getting 3mb downloads however now I am experiencing 2mb initially and then dropping to 1mb and less.

I did a speedtest on my computer and I am getting 20mb however on wifi I am getting 30mb.

Done a test with bt speedtester from exchange and it does say 31mb. I have tried the BT Wholesale Broadband Performance Test and the speeds vary from 3mbs to 19mbs, often less than 10. I've tried the further diagnostics option however I don't have the boardband circuit number and it is difficult to call up. The postcode, building number option keeps saying there is no fibre to premise.

Could someone offer some advice on checks I should make?

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Recognised Expert
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Message 2 of 4

Re: Slower speeds on ethernet through powerline

What power lines have you, and if you plug them in to the same power outlet do you get a good data connection?
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Beginner
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Message 3 of 4

Re: Slower speeds on ethernet through powerline

I am using the  TP-Link TL-PA4010KIT Nano AV600 Powerline. It was working fine until recently, I've been using it for 2 months at most. 

I'll need some time to check it on the same power sockets since I will have to move my computer downstairs.

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Distinguished Sage
Distinguished Sage
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Message 4 of 4

Re: Slower speeds on ethernet through powerline

See

Interference to copper delivered broadband (FTTC)  and ADSL, caused by Powerline Adapters. Not FTTP.

Powerline adapters or broadband extenders work by transmitting radio frequency signals down your mains wiring.

These frequencies start at about 2MHz and extend right up to 30MHz and beyond.

VDSL  also shares part of that frequency range. That means that if any of the signals from the powerline adapters, get into the phone wiring, or the BT Home hub, then they are going to reduce the quality and speed of your broadband connection, as they will interfere with the frequencies used by VDSL. You may see that as a drop in the upstream or downstream noise margin, or a drop in the maximum available speed. This can even affect ADSL under certain conditions, where other mains devices generate lower frequencies, when exposed to the higher frequencies. (Demodulation taking place).

It may even cause your home hub to disconnect, and then attempt to reconnect again. You will see this change on the lights of the home hub, and other devices will also disconnect.

This problem may get worse as the powerline adapters carry more data.

Its important to make sure that none of your phone wiring, including any extension wiring, runs near to your powerline adapters or main wiring.
If possible, plug the home hub into a different socket from the powerline adapter.

They may also have an affect on the download speed of an ADSL2+ connection.

 

TP Link ones seem to be a major source of problems. See the following threads on the forum.

My Powerline adapters slow down when downstream sync is high!

BT Infinity VDSL worse performance than ADSL

However there is a fix for the TP Link ones which was posted by davejanney, one of our forum members. Thank you.
You need to download this utility TP Link utility

Once you have it open go to the ADVANCED settings for the adaptor that is connected to the router. on the left hand side of the menu is MODE.
Within the mode settings there is an option to LOWER PLC-TO-VDSL INTERFERANCE MODE.

Now it warned me i would see a drop in speed however the change was instant! the speed on Speedtest.net doubled when running through the adaptors, and it is rock solid stable. i downloaded a 1Gb file with any connection drops, before it would have dropped out every 30sec.

See this post on the Plusnet forum Powerline Ethernet - A warning

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