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[Dray]

Do you have a UTP modem cable?

[tbailey2]

Do you have a UTP modem cable?

I don't know - its 10 inches of screened twisted pair cable into the master socket so I guess so.

[Dray]

STP rather than UTP then

[tbailey2]

STP rather than UTP then

Okay I give up - what's the difference?

If S=Single and D=Double then the spare I have has 4 wires....

[loonylion]

STP rather than UTP then

Okay I give up - what's the difference?

If S=Single and D=Double then the spare I have has 4 wires....

STP = shielded twisted pair, UTP = unshielded twisted pair. There's also FTP, which is foil shielded twisted pair.

[WWWombat]

I'm using the 500 AV Wireless+ units

What units exactly are they please?

In the power socket by the router, I have a Devolo dLAN 500 AV duo+
In the power socket elsewhere, I have a Devolo dLAN 500 AV Wireless+

I bought them as part of the Devolo dLAN 500 AV Wireless+ Starter Kit, which is this item at Amazon:
http://www.amazon.co.uk/gp/product/B00A67I5EK
Not cheap, though mine was £95. Worth noting that the ethernet sockets are 10/100 but not gigabit, in these models.

The router (Billion 8800NL) is plugged in via the pass-thru power, but nothing else is.

The Devolo's report speeds between them at 220Mbps (from router to remote) and 250Mbps.

However, when performing speedtests, I'm limited to around 56-60Mbps downstream, when a direct-wired laptop can get ~75Mbps.

[tbailey2]

STP rather than UTP then

Okay I give up - what's the difference?

If S=Single and D=Double then the spare I have has 4 wires....

STP = shielded twisted pair, UTP = unshielded twisted pair. There's also FTP, which is foil shielded twisted pair.

Ah! Thanks. I still find it difficult to believe that a homeplug just inserted into a ring mains 60 feet away from the modem would generate that sort of interference on even an unshielded flat 10 inch lead?

Mind you there may be another reason for it due to the way the electrics are wired in this older building. I may need to get someone in who knows what they are doing  to try alternative earthing arrangements I suspect. It was all redone 23 years ago when we moved in for safety reason but it was dial-up then.......

[WWWombat]

Thanks for posting your stuff @BaldEagle. Will try to go over it this afternoon, alongside annem's and jid's.

Any more text-stats & graph montages to add to the mix?

[tbailey2]

What units exactly are they please?

Devolo dLAN 500 AV Wireless+ Starter Kit ....

[WWWombat]

Ah! Thanks. I still find it difficult to believe that a homeplug just inserted into a ring mains 60 feet away from the modem would generate that sort of interference on even an unshielded flat 10 inch lead?

It may be being transferred through the mains, and into the PSU of the modem, and on into the power circuits.

Have you got the modem PSU plugged into the pass-through? This is supposed to be filtered.

[tbailey2]

Ah! Thanks. I still find it difficult to believe that a homeplug just inserted into a ring mains 60 feet away from the modem would generate that sort of interference on even an unshielded flat 10 inch lead?

It may be being transferred through the mains, and into the PSU of the modem, and on into the power circuits.

Have you got the modem PSU plugged into the pass-through? This is supposed to be filtered.

Sorry, what is a 'pass-through' ?

Edit
Um... if you mean the plug-in socket on the Homeplug, don't think that idea would work too well, even if it had one (these don't my other ones do but are no better). If you look at the original posts, the modem/router is on a UPS (dedicated), plus all the other equipment in here mostly runs off two more 1500W UPS. The Homeplug has to go into an unfiltered socket directly to the ring mains or it isn't going to work I guess

[WWWombat]

Ah. That complicates things somewhat...

I agree that the homeplug ought to go onto an unfiltered connection to the ring main - and preferably without an extension lead.

However, I'd have thought your UPS would effectively filter the homeplug signal from the PSU anyway - and you wouldn't suffer from this problem.

But your UPS ought to make it easy to test whether the errors are mains-borne or RF; just have the modem run from UPS on battery while the homeplug remains in the mains. That way there would be no path from the ring main via the UPS to the modem.

Thinking further, though, perhaps you would need to run the test without even a network connection into the modem - just to be sure it isn't coming through the ethernet cable either.

[tbailey2]

Ah. That complicates things somewhat...

I agree that the homeplug ought to go onto an unfiltered connection to the ring main - and preferably without an extension lead.

However, I'd have thought your UPS would effectively filter the homeplug signal from the PSU anyway - and you wouldn't suffer from this problem.

But your UPS ought to make it easy to test whether the errors are mains-borne or RF; just have the modem run from UPS on battery while the homeplug remains in the mains. That way there would be no path from the ring main via the UPS to the modem.

Thinking further, though, perhaps you would need to run the test without even a network connection into the modem - just to be sure it isn't coming through the ethernet cable either.

Thanks. Tried the UPS-with-no-mains idea but no improvement. The other idea will take MDWS off-air so will leave that until I have to take the server down for some other reason.

[burakkucat]

Removed. Ideas please?

Take them back and request a refund! 

[vic0239]

I used to use these devices, but found they induced interference on my vintage radios, particularly in the VHF band. Battery sets were not affected so I assumed it was mains borne. Switched them off and the interference was gone.