SRL Archive - NOTA

How do these guys work?

2 guesses here.
1: it OBVIOUSLY gets the internet from the outlet
2: if that's not it, satellite perhaps?

I have never seen that. H4X!

Let's say you got the modem, router, and a desktop downstairs, and you want to add a desktop upstairs. You can't or won't do wifi, and you don't want to run a cable. You get one of these kits, and it comes with 2 adapters. You put one by the router, with an ethernet cable to the router, and power cable to the wall. The other one goes with your desktop upstairs. The two units encode and decode the network data so that it can be transmitted between them over the power wiring in the walls. It's more convenient than running cable, but your mileage may vary based on electrical appliances causing disturbances.

So it's like wifi.. without being called wifi? And you can't use different things with out, you can only use it if it's plugged into the router?

It's not Wifi. It uses wires still. Just not EXTRA wires.

it sends codes through your existing electrical wires in the house to make internets….very interesting….
Maybe a way to tap into it off the local grid? But I'm sure the higher voltage and possible multiple phases on the out side lines would drowned out any network signals without a huge frequency isolator….

http://computer.howstuffworks.com/power-network.htm

Very very interesting, I would like to know so more applications for this

It basicly transfers the network packets through the power grid (Correct word?). They work pretty well on a 8/1 connection, they should however lose some quality for higher connections.

Yes like everyone has all ready said what is basically does is allow you to use any mains socket on your house to revive a network connection through, you firstly have to connect one to your router/modem to get it started, it should not send the signal back past your main power cable (past fuse box). its an good way to to network connection throughout your house if wireless will not work.

good for not wanting to drill holes and lay cable.

From: bobzilla69
Yes like everyone has all ready said what is basically does is allow you to use any mains socket on your house to revive a network connection through, you firstly have to connect one to your router/modem to get it started, it should not send the signal back past your main power cable (past fuse box). its an good way to to network connection throughout your house if wireless will not work.

good for not wanting to drill holes and lay cable.

I didn't read others posts ;) Too lazy :redface:

How the hell does it sent 'internet' through the outlets, I find that amazing and magic!
You don't need any special/current outlets (as in this will work in old houses too?).
And there is NO wireless-ness involved here at all?

From: YoHoJo
How the hell does it sent 'internet' through the outlets, I find that amazing and magic!
You don't need any special/current outlets (as in this will work in old houses too?).
And there is NO wireless-ness involved here at all?

It modulates the internet signal into the basic sin signal that main grid has. Then the other end of that device, gets that from the outlet.

think of it as the one from the moden to power socket is an encoder and encodes the signal that can travel through power line, then at other end you have a decoder that changes it back to "normal" signal and you can also get wireless versions of it.

Just like howthey turn hot water heaters on when it's off peak, the signal gets sent along with the mains and turns a relay on

I just can't see how there is no interference, because normally when power and data cables are ran there is a minimum amount of separation between them

I remember reading about this in a magazine ~2 years ago… It was extremely simplified and I'm sure I don't remember everything, but this is what I think I remember:
1st: a perfect sine curve, AC power. (my hands aren't that good, so imagine it is a perfect sine curve :p )
2nd: now theres some spikes in it, up means 1, down means 0.

Basically what Zyt3x said. The box probably use inductors and capacitors to encode a message in the AC signal in your home wiring (making spikes on the sine wave). The spikes have no effect on appliances since the voltage variation is probably only a few volts out of the peak ~160V (since 110V is the RMS voltage). The only other thing sensitive enough in the house to read these spikes is the other network unit.

Which is why you have to go straight to the wall, because the power conditioning in a UPS or surge protector will screw it up.

Also, some have the option of encrypting with a password, because otherwise if you neighbor's house is on the same transformer, they can get in.

More info here: http://www.webopedia.com/DidYouKnow/Hardware_Software/2007/Powerline_Networking.asp

From: Brain
Basically what Zyt3x said. The box probably use inductors and capacitors to encode a message in the AC signal in your home wiring (making spikes on the sine wave). The spikes have no effect on appliances since the voltage variation is probably only a few volts out of the peak ~160V (since 110V is the RMS voltage). The only other thing sensitive enough in the house to read these spikes is the other network unit.

what if the house has alot of fluros and the powerfactor correcton capacitors filter out the variations in the new sine wave?

From: Bonfield
what if the house has alot of fluros and the powerfactor correcton capacitors filter out the variations in the new sine wave?

Then that's bad…

From: Bonfield
what if the house has alot of fluros and the powerfactor correcton capacitors filter out the variations in the new sine wave?

I'm pretty sure most powerfactor correction capacitors are at the large transformers and power stations. At least I haven't seen any huge fluid filled variable capacitors on my roof (or any roofs anywhere). Of course, some large factories that run huge 3 phase motors with giant inductances have their own PF correction caps in order to keep the power company happy, but most homes don't.

Wasn't sure what a fluro was, looked it up to find it is most often used to grow…plants…if you're introducing a large inductance and then introducing a large capacitor to correct for the inductance than it's you're own fault for trying to grow lots of plants in your house, that's what the sun is for.

just your normal fluroescent lights, they dont have to be massive capacitors to fiter the waves, they are hardly used in domesic work

but i was just wondering if the house did have a few circuits with capacitors in it what was being sent by the router would not be received