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PLT/Homeplug and ITU 02 June 2011

G3YBO
Grafter
Posts: 103
Registered: 27-11-2010

PLT/Homeplug and ITU 02 June 2011

Seems that the ITU do not agree with the way PLT is working out here....
ITU Geneva 02 June 2011
Geneva, 02 June, 2011 – Concerns that home networking products using power line transmission (PLT) technology may cause interference with radio services led to a Forum last week in Geneva to address the issue. ITU’s own home networking standard ITU-T G.hn was considered to have electromagnetic compatibility (EMC) and mitigation techniques that go well beyond those considered essential for protecting radio services.
Given the variety of electronic devices in our homes, strict EMC requirements are imperative. Over-the-air broadcast services in particular could be subject to interference from PLT systems.
The event took place in parallel with an interoperability event giving ITU-T G.hn chipset vendors the opportunity to test their products, which will be on the market later this year. It brought together radio spectrum experts from national regulators, service providers, and product manufacturers, as well as standards development organizations (SDOs) and industry alliances including ETSI, IEC, IEEE, HomeGrid Forum, IARU, NAJO/IAU and HomePlug.
The Forum successfully achieved its goal of agreeing on commitments and future actions by all stakeholders to resolve interference issues in the interest of consumers. A key conclusion is that ITU will act as the focal point for coordinating other SDOs and industry alliances in order to agree further developments.
“There are PLT products on the market that do not conform to the necessary EMC standards, and this is very much a concern,” says Dr Hamadoun Touré, Secretary-General, ITU. “We are fortunate in ITU to have telecom and radio experts from both the private sector, government and regulators. Together they have agreed the necessary requirements to ensure that products conforming to ITU standards do not cause interference, which may have potentially serious consequences. We would caution service providers and others against rolling out technologies conforming to specifications that do not meet ITU requirements.”
John Shaw, representing BBC World Service, said at the meeting: "For broadcasters, it is extremely important that products sold do not interfere with the reception of programmes or reduce coverage. We applaud the efforts of ITU to ensure international acceptance of the organization's stringent guidelines on compatibility between electronic communication systems and the use of the radio frequency spectrum." Similar views were also expressed by representatives of the aeronautical and radio astronomy communities.
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6 REPLIES
Community Veteran
Posts: 16,814
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Registered: 06-11-2007

Re: PLT/Homeplug and ITU 02 June 2011

But.,.... that "precis" of the meetings, does not give a "final word" that all the uk PLT homeplugs should be replaced, or are safe to use (i.e. do not cause interference)..  Or am I missing something?
G3YBO
Grafter
Posts: 103
Registered: 27-11-2010

Re: PLT/Homeplug and ITU 02 June 2011

They have not made a Homeplug/PLT that would pass the EMC tests.....So time will tell what will be the correct way out of a mess by Ofcom.......If they did their job we would not see the problems.....Now we hear that 4G phones will wipe Freeview
TV......Their answer to that is a filter will sort it all out.....Again time will tell.............
oldgeezer
Grafter
Posts: 206
Registered: 02-02-2010

Re: PLT/Homeplug and ITU 02 June 2011

I have a pair of A V homeplugs made by Asus. When I heard of the concerns expresed by radio hams and others about interference problems I conducted a little experiment using a 100 kHz to 30 MHz receiver and established that the Asus homeplugs seem to be fitted with pretty effective filters which notch out the interference around the amateur radio bands. Outside these bands the interference was pretty dire but tune into the ham bands and virtually nothing even with an aerial wrapped around the mains lead. Perhaps with suitable design a way forward can be found.
Oldgeezer.
G3YBO
Grafter
Posts: 103
Registered: 27-11-2010

Re: PLT/Homeplug and ITU 02 June 2011

Hi oldgeezer..................Ok on Asus units.............Do you have a model number please...............I have a Asus Netbook and
it works well......Yes Ok on notches in ham bands....Thanks
oldgeezer
Grafter
Posts: 206
Registered: 02-02-2010

Re: PLT/Homeplug and ITU 02 June 2011

Hi G3YBO.
The units are model number PL-X32 and seem to be available in two different versions. Earlier ones had a separate figure of eight mains lead and the later version, which I have, is constructed as a "Wall Wart". The cut off around the amateur bands seems amazingly sharp (must be digital I guess).
I'm not nowadays familiar with the exact UK frequencies 'so perhaps tailored to the American bands if they still differ slightly.
I'm not using them at the moment as I managed to use an existing ADSL extension cable run under the floor void as a ethernet cable.
It was one of those fancy foil & braid shielded jobs which I discovered was constructed of two Cat5e twisted pairs. It runs nicely as a ethernet cable at 100 Mb/s, (no use for Gigabit of course, not enough pairs).
I can't get down under any more as we have had new fitted carpets over the ground floor and it was a case of make do.
Oldgeezer.
G3YBO
Grafter
Posts: 103
Registered: 27-11-2010

Re: PLT/Homeplug and ITU 02 June 2011

Ok thanks for that oldgeezer......Yes I run RJ 45 from room to room, now on FTTC so great speed.....Again thanks....Roger