Can you use PowerLineNetworking devices to join two separate networks?

I've been asked to draw a basic network map for a proposed networking solution for a client that has currently has 3 separate buildings, each with indivual networks/internets, to join together to create one network.

They have tried wireless but the signal loss is too great because of the distance and obstacles.
I've suggested PLN devices, but I've never used them before.
Are they the best option and can you use them in a configuration like i'm suggesting?

The layout of the current and proposed setups are below.

current layoutproposed layout
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Reece DoddsAsked:
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kdearingConnect With a Mentor Commented:
Given that we're only talking about 40m, I see 2 solutions:

1. Run an outdoor-grade ethernet cable as DaveBaldwin suggested

2. Reconsider the wireless solution. With the right antennas and proper placement, It should work well.

As far as the powerline stuff, I doubt it will work properly unless you go with high-end equipment such as Corinex.
http://www.corinex.com/
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AustinComputerLabsCommented:
They are usually used for home and need to be on the same electric meter or circuit.
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Reece DoddsAuthor Commented:
Pretty much the same circuit.  There is one main meter and 4 sub-boards.
Doesn't appear to be any high-voltage transformers in between - i've heard these are bad for PLN devices.
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AustinComputerLabsCommented:
As these are normally for home networks and not made to move through a long path, you will want to make sure it can handle the amount of traffic nessesary and maintain a decent network speed.

It is unlikely it would work for a good solution but if the client wants to try a cheap option with the risk of it not working, I guess you could try it.

You mention that there is another dwelling but is there space between the buildings or are they connected.
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Reece DoddsAuthor Commented:
the two on the right are connected with the dwelling in the middle.
the bigger office on the left is a different building.

These were once just normal homes, turned into 3 offices and a Women's refuge centre.


 googlemaps satellite view
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AustinComputerLabsCommented:
You can be pretty sure that each home/office has its' own meter, I have heard of these devices pushing past meters but I would not depend on it.
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Dave BaldwinFixer of ProblemsCommented:
I would not recommend PLN for this application.  I have, however, run outdoor grade ethernet cable between buildings and that allows a full speed network.
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Reece DoddsAuthor Commented:
if i were to consider a wireless solution...

would http://www.tp-link.com.au/products/productDetails.asp?class=&pmodel=TL-ANT2414B mounted to the exterior of the rear building work with http://www.tp-link.com.au/products/productDetails.asp?class=&pmodel=TD-W8950ND and a few G wireless cards in the front computers?
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kdearingConnect With a Mentor Commented:
The solution you're looking for is a wireless bridge.

This consists of 2 wireless access points (typically with external antennas) such as:
http://www.tp-link.com.au/products/productDetails.asp?class=wlan&content=fea&pmodel=TL%2DWA701ND
and the antenna you chose (and appropriate cabling).

One AP is configured as normal and the other as a client bridge.

A good source of antennas and cables of all kinds
L-Com:  http://www.l-com.com/home.aspx
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