Powerline HomePlug Adapters - The Pros and Cons
Need to get an Internet connection in a different room, and can't use wi-fi? Could a HomePlug Powerline adapter be the answer.
Here, we explore these devices in detail, and we also look at the down side of this technology.
What is a Powerline Adapter?
Powerline adapters, also known as HomePlugs are devices used for home networking - typically where you need to connect a gadget or box to the Internet in a room where there is no Internet.
Why would you need a Powerline Adapter?
Let's assume you have your Internet router in one room, but you need Internet in another room in your home. You could use wi-fi, but there are some situations where wi-fi isn't an option, such as the distance involved, or if your device doesn't support wi-fi.
A good example of where wi-fi doesn't work is in your lounge, where you may want to connect your Freesat, BT Vision or games console to the Internet, or perhaps you have a webcam or printer that you want on the net.
In these cases, a Powerline adapter, also known as a HomePlug, could hold the answer.
How does a Powerline Adapter work?
Rather than using radio waves, as with wi-fi, a Powerline adapter uses your home's mains wiring to send data around your house.
They're very easy to set up, and are generally effective. You'll typically need two Powerline adapters. Here's how to use them:
- Plug one into a mains socket close to your wireless router
- Connect a network patch lead from a spare socket on your router to the Powerline's Ethernet socket
- Now, where you need your Internet connection, plug the other adapter into a nearby mains socket, then use a network patch lead to plug into the target device.
 Plug into router |
 ...using a patch lead |
 Then connect to HomePlug |
Once connected, you should see some kind of connection light, to indicate data is flowing.
Different types of Powerline adapter
The two things that affect what type of powerline adapter you buy:
- Speed: There are two main types, "up to 85Mbps" and "up to 200 Mbps"
- Distance: Typically up to 200 metres
Prices for a Powerline kit start from the £60 mark, and can be found at the following suppliers: |
The Problem with Powerline Adapters?
There is one inherent problem with Powerline adapters, and that's that they can cause interference to short wave radio reception.
HomePlug adapters are often referred to as PLT (Power Line Telecommunication) devices, and shortwave radio enthusiasts claim that they can effectively turns your home into a low-powered transmitter, as your home's mains cabling radiates a low-power "noise" in the band used by short wave radio (2Mhz to 30Mhz).
If you're using a Powerline adapter and you have a radio amateur living two or three doors away, you may be broadcasting noise on a frequency he's using for his hobby. The interference can radiate out around 100 metres. There's also evidence that Powerline adapters can cause interference to FM and DAB radio reception.
Shortwave is also used by some long-range aircraft and shipping, and many still use SW radio to listen to broadcasts from other countries, sometimes using a radio system called Digital Radio Mondiale (DRM), which is in use in parts of Europe, notably Germany.
Listen to our interview with the Chelmsford Amateur Radio Society: |
Interference to FM and DAB radio
A new generation of Powerlines are on the way, and there's strong evidence that these cause interference with FM and DAB. Take a look at the following video clip for an overview:
For more discussion of this issue, catch our May 2010 update:
Powerline Problems Discussed in May 2010 Update:
|
So are HomePlugs legal? Yes, absolutely, according to current UK law. Manufacturers have to conform to the Electromagnetic Compatibility Regulations 2006, and a company can be prevented from selling these if they do not comply.
The UK Regulator OfCom has received a series of complaints, all from radio enthusiasts, the majority of which have been resolved by the complainant switching to a cabled Ethernet solution, or by using wi-fi for networking (Source Ofcom Sept 2009)
The consensus from radio enthusiasts and radio hams is that the technology is pushing ahead through corporate pressure, and that the regulators aren't doing enough to control what's seen as abuse of the radio spectrum.
Affected by interference?
If you're affected by interference from Powerline / HomePlug adapters, you can report your problem to Ofcom on 0300 123 3333.
Manufacturer Belkin also have a complaints line: 0845 607 7787
Good or Bad
Got a view on HomePlugs? Answer our quick poll:
Your thoughts on Powerline / HomePlugs: |
Speak out against Powerlines
For more on the campaign to outlaw Powerline adapters, visit UKQRM Fighting For Shortwave Radio.
There's also a Save Shortwave Petition.
Got a comment? Want to have your say? Please use our Powerline Interference thread in our forum.
The Alternative to Powerline?
- Go Wireless - Details on using Wi-fi networking on our Wi-fi page. For devices that don't support Wi-fi, consider a Wireless Gaming Adapter (converts Ethernet to wireless)
- Run cables - You can buy CAT5 networking cables in lengths up to 50 metres from Maplin.co.uk and run a cable from your router to your target device, or cable up two Ethernet wall sockets using CAT5 cable to get an extension socket where you need it.
Questions on HomePlugs?
Q. Will HomePlugs work where the transmitter and receiver are on different fused circuits from the Mains Board (John L)
In most cases, HomePlugs will work on a electrical circuits that share the same electricity meter. If you have a three-phase power supply (which is not that common for residential properties), Powerline adapters will only work on the same phase.
Q. As I will require the internet connection to feed a device in two different rooms, am I able to purchase one sender and two receivers? (Mike G)
Yes - that's not a problem. A one-sender, multiple-receiver option is supported using Powerline adapters, although the more devices you have active, the slower the overall network speed. We'd also recommend using the Powerline adapters from the same manufacturer. Some manufacturers even sell kits of multiple devices. At the time of writing, PC World is selling a Devolo 3 pack (pictured) that might servce your needs.
Q. Will the powerline adapters work if I site one downstairs and one upstairs? (Brett)
In most cases, yes, flights of stairs aren't an issue. Provided the transmitter and receiver go through the same fusebox and electricity meter, you should be able to use a powerline adapter.
Q. Security: What prevents the network created by PowerLine devices to be accessed outside or past the consumer unit? (Paresh)
Powerline adapters have a limited range, and only transmit on a single mains phase. Neighbouring properties are often on a different phase. If security is a concern, note that HomePlug adapters use 56bit AES encryrption technology and are 'paired'.
Q. Firewall: Will a Firewall need to be setup to allow network connectivity (Paresh)
A 'Firewall' is used to prevent unauthorised access to your network or to a computer. A firewall can be hardware (e.g. Built-in to your Broadband router) or software (e.g. Firewall software such as McAfee Internet Security, Norton 360 or ZoneAlarm).
If you're looking to connect a device such as a computer to the Internet using a pair of Powerline adapters, then we'd recommend that you protect yourself with a firewall. Ideally, your Broadband connection should be secured with a hardware firewall (this may be built-in to your router), and each computer should have up-to-date firewall software installed - regardless of whether it's connected to the router by a cable, a wi-fi adapter or a set of Powerline adapters.
As for security of HomePlugs, the link between two Powerline adapters uses encryption technology, so has a level of protection. See the FAQ on Powerline Security.
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