IOGear GHPB31 - Manual (Page 21)

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2. Once the utility starts, it will display the MAC
address of the device your computer is
connected to as well as the signal strength.
The Link Quality line shows whether the link is
good or bad. A green line all the way to the
right is good. A short red line is bad connec-
tion. You will have to do a troubleshooting, if
you see a short red line.
Homeplug Configuration Utility