I think you meant to reply to me.

I read "I reconnected the home plug and using the wifi on the same laptop got these results" to mean you were connecting wirelessly to the Homeplug in whichever room you were. This kind of thing.

Still worth trying Ethernet from laptop into a remote Homeplug. Make sure the wifi on the laptop is turned off, as some kit connects by wifi even if it has an Ethernet connection available.

Because of things like

a) RWIN size
b) ISP Congestion
c) Behaviour of your Wi-Fi network

etc etc

We know you can pull the single file at 940 Mbps if you have a connection up to it, and more if you are a rare 10 Gbps user.

Wi-Fi is a shared medium, i.e. airwaves are shared so someone elses Wi-Fi may be interfering and by throwing more packets at it you swamp them.

In reply to a post by ciday:

I've had a look at the diag software. It seems to think the link between the home plugs is fine with a speed of about 170Mbps. My friend who actually runs the ISP I use (A small business reseller) seems to think a sag in incoming voltage might cause issues with some homeplugs. However I do not have a multimeter to test that.

Unlikely as the mains voltage has nothing to do with the signal transmitted. A high frequency data signal is injected onto the power lines and recovered at the destination point. There will be some extremely good filters in place to keep any 50Hz and low harmonics away from te data lines. If you could power the homeplugs from an alternative source (not advisable to try) they would still work and send data over the mains wiring even when the mains power is off.

Apologies if this comes off as snarkier than I meant (It isn't meant to be) but I already did what you suggested in my previous post. PC with WiFi off and into the router via ethernet as well as with only one laptop directly plugged into the VDSL modem to eliminate any other cause. It does appear the WiFi may be partially to blame as my previous results shown. The last test with WiFi on was to confirm if my theory was the case. It does appear there may be an issue with the WiFi itself.

For avoidance of doubt, there isn't any WiFi ability on the homeplugs I'm using and they are only there to connect the wireless router to the VDSL modem. This is because the master phone socket is downstairs in one corner of the living room and the modem has to go there, but I could not leave the router there too as wifi signal performance degrades upstairs where most of the devices and PCs in the house are. If I had the choice as well as time and inclination I would've put in ducting with ethernet cables everywhere. However this is a no go area and also a lot of the devices now in the house are phones and tablets that obviously lack ethernet ports of any sort.

This still doesn't entirely explain the odd issues but I'm willing to live with them as long as it doesn't affect the long term reliability of the connection. As I said before I was just curious to know what could be causing the odd results and if it could be a problem in future.

That also is interesting. In particular, that the router is fed by Homeplugs. What rated speed are they please? 500Mbps, from your earlier link.

Those should be OK.

Edited by RobertoS (Tue 12-Jan-16 15:49:26)

Unless there is interference in which case they may be running much less than the "headline" speed.

VDSL2 and homeplugs can interfere with each other, so it may be down to that.

Plenty of people have them co-existing fine, but replacing the home plug link between modem and router with a temporary cable for testing should show if a cable will provide much better speeds, and then its a case of figuring out a way of getting a suitable Ethernet cable installed (e.g. I use an external grade CAT5e to get from loft room to lounge down the outside of the house).

Given the house is not my own (Still live with parents) I suspect trying to put in some ethernet cable permanently is not going to be an option. I'll investigate further when I have time but thanks for the input so far guys and gals.

In reply to a post by ciday:

Given the house is not my own (Still live with parents) I suspect trying to put in some ethernet cable permanently is not going to be an option. I'll investigate further when I have time but thanks for the input so far guys and gals.

You can get flat internal CAT5E which will go under carpet or wood flooring from CPC