Edimax Technology HP-8500K (2pcs a set) - Manual (Page 8)

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Chapter 3: Configuration
Overview
The HomePlug device uses 56-bit DES encryption to block outside access. The
key is set by using the HomePlug Configuration Utility on the CD. By default, the
protection is enabled. However, it is recommended that you change the default
network password. All your HomePlug devices must use the same network
password in order for the computers to be networked. Make sure that all devices
are loaded with the same network password.
Diagnose Powerline network
Part 1: Diagnose a Local HomePlug Device
Double click the PowerPacket Utility icon on your desktop to open this utility
show in the screen below
The Main tab shows the HomePlug units that are connected to the current
computer and oter devices on the network. It will also tell Mac Address of
each device. It will let you refresh the window, if you change devices, and
also will allow you to connect to different networks if multiple units are
connected to your computer.