dealszyxel pla4215 500mbps powerline pass-thru gigabit…

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The two units appear to be identical. Does that mean that if I buy two sets I will be able to hook any one unit up at my internet connection and then have three remote units elsewhere? If so, I'll be in for two (maybe three).

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@nortonsark: The key info is under the heading "What's inside the box".
Answer:
(2) ZyXEL PLA4215 500Mbps Powerline Pass-Thru Gigabit Ethernet Adapters

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@nortonsark: The recommendation for Powerline adapter is up to 2 pairs. Beyond that, the speed will decrease.

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@vuhoanganhtu1992: Not many people actually need a full 500Mbs though. Many still have 100Mbs network card on their machines.

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I set these up at my sister's place to use as a makeshift bridge to create a second wifi network on the opposite side of her house. Works like a charm and is surprisingly fast and reliable.

And the previous comment is correct, 500mbps is roughly ten times the speed of higher end broadband in the US. Even if you get half the throughput, the only place you're likely to see any slowdown is through higher end computer to computer transmission on the network, but if you need that speed you probably have a more expensive solution in place already...

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Does my dryer have to be on? It sounds like a funny question, but when these first came out, they could not communicate across household AC line phases unless your 220 equipment was running (ie. such as a dryer).

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@hayedid: Nope. I got these about a month ago for my ps3 because of a weak wi-fi connection and kept booting me out of games cuz of lost network connection. I've had zero problems and have never been kicked off. I have no clue what runs on the 220 but i log tons and tons of hours gaming and id imagine i havnt had a 220 appliance running the whole time. I'll probably buy another set next time they come up if they can all be connected togather.

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@hayedid: I haven't checked on these, but that is a limitation of how houses are connected. In a typical residential installation you have access to 2 in-phase ~120V lines, they are magnetically isolated at the transformer and would only have an electrical connection in a 220V~240V appliance, as you mentioned. This isn't a limitation of the technology on the powerline adapter, it is just how residential wiring works. This also applies if you have access to 2 different phases, the problem is one of electrical continuity.

@nicsmith: It is very possible both outlets are on the same buss bar inside your panel so you would not have the problem havedid mentioned.

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These are fantastic, easy to set up and work so well. I'd buy another set if they were available again.