Sometimes the range of a wireless router isn't good enough or it's simply obstructed. One method of improving wireless coverage is via powerline adapters.
The initial "Master" powerline adapter would normally be connected to one of the LAN ports on your wireless router via a network cable (a.k.a. patch cable or Ethernet cable).
Your may have one or more "slave" powerline adapter(s) to extend your network to other areas of your house. Slave powerline adapters can also double up as wireless access points.
The powerline adapters "talk" to one another through your household wiring. Therefore they may not work properly if your wiring is very old or if the distances are very large.
Plugging powerline adapters into multiboards (a.k.a. power-strips) or extension cables can also cause them not to work. Devices in your house or workshop that draw large currents such as water pumps or welding equipment may also interfere with them.
Powerline adapters normally have 3 lights.
In the example below the top one is power.
The second one indicates "pairing" or in other words, indicates it's talking to another unit.
The third one indicates a network cable is plugged in and it's "talking" to the device at the other end of the network cable.
There may be a fourth light for "WiFi" if your powerline adapter supports it.
