I can vouch for the quality of Devolo. When I first tried homeplugs I had terrible trouble with more than one brand and eventually ended up with Devolo. Not cheap by any means, but did the trick

Having said that you are gradually discovering that all sorts of interference can wreck speeds, much depending on the quality and age of your wiring

Devolo were my first initial choice but I wanted something with passthrough and more than 1 gigabit ethernet port.
I'm away out to get some ferrite cores as some supplies around my house are bare. Especially close to the homeplug. If this does not help I think they will be going back. I've changed the RJ11 cable to a shielded one now also. I guess I will have to wait until the DLM decided to put me back on fastpath or reduce the interleaving.

Ping times have increased from 27ms to 42ms (Pinging BBC)

Have you tried moving the homeplug to a power socket further away from the modem's power supply?

I don't know how many sockets you have available, in my house there's never enough.

In reply to a post by obroad:

Have you tried moving the homeplug to a power socket further away from the modem's power supply?

I don't know how many sockets you have available, in my house there's never enough.

No not yet. Mainly due to that if I do that, I will need to run a cat5 cable to another room to reach the router/homeplug which sort of defeats the purpose.

Edit: I've now installed ferrites on the modem power supply along with a shielded twisted pair RJ11 cable. I'll leave it a few days to see if DLM reduces the interleaving. If not then they will be removed and trusty WiFi will be used instead.

Edited by deleted (Thu 12-Feb-15 17:00:45)

Units have been boxed back up and are being returned today. Overnight I think the DLM has kicked in again and increased me another interleaving point. My ping times have gone from 27ms to 44ms and a total loss of speed from 71Mb to 54Mb in the space of two days.

In reply to a post by obroad:

Have you tried moving the homeplug to a power socket further away from the modem's power supply?

I don't know how many sockets you have available, in my house there's never enough.

My IP Profile has now started recovering. The ping has dropped 10ms and profile has gone from 48Mb to 63Mb.

Ok well it looks like my pings have returned to normal which is approx 24ms pinging the BBC. However, My line speed still shows 65Mb. I'm tempted to reboot the modem to force a re-sync to see if that shows me syncing at the original 75Mb instead of the 65Mb it is currently showing in Zens customer portal. Or should I just leave it?

I really don't know why anyone uses Homeplugs. They are about as useful as the proverbial chocolate teapot and are just for the lazy. I've tried them as an experiment and they are useless. Does anyone consider a speed over Homeplugs of 10% of your connection speed to be adequate? The only way to go is to run Ethernet cable to wherever a connection is needed. Either under floorboards or using external Ethernet cable to get from upstairs to downstairs with out spoiling the decoration. Probably 10 % of the cost of Homeplugs and with 100% connection speed. Just involves a little effort and bit of common sense.

Edited by deleted (Wed 18-Mar-15 21:18:56)

That's the plan now. I'm pulling the carpet up soon to replace and also sort some duff floorboards so when they are up, I'll be dropping a few runs of Ethernet cable in. Wish I never bothered with them but thought I would give them a try.

Good for you. It'll be far cheaper than Homeplugs and 10 x the performance. There is always a way to run a cable neatly with a little thought. Hope you can get a refund on them.
Personally I think Homeplugs should be banned as not fit for purpose. They are just a con.