What does it mean if the local area network connection is unplugged?

The WiFi extenders work by receiving packets from the wireless router, and then retransmit the packets on to the receiving devices (computers, smart phones, tablets, etc). The same happens for packets going from the devices to the router. As each packet has to make two hops instead of one, the speed of the WiFi connection is immediately reduced by around 50%.

Also, there is an increase in ping times (lag). There is a further effect that can slow down WiFi networks even further. If the device (computer, etc) and the router cannot detect each others' transmissions, then they may both start transmitting at the same time.

The extender in between them receives both signals at the same time, but unfortunately, this collision of packets results in both being corrupted and lost. With TCP the lost packets are eventually detected at a high level in the protocol, and a recovery procedure has to be initiated. This results is further delays in the transfer of those packets.

You should find Powerline networking using adapters such as http://www.tp-link.us/products/details/?... give better results. Unlike WiFi extenders, Powerline systems can provide extra WiFi coverage without the same reductions in speed. I hope this helps.

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