HP Deskjet 6840 Color Inkjet Printer - Manual (Page 53)

Link light
The Link light is solid when the printer is connected to an Ethernet network and
powered on.
State of the Link light State of the printer
On
Connected to an Ethernet network and powered on.
The printer's wireless radio is disabled when a Ethernet
cable is connected to the printer.
Off
Not connected to an Ethernet network or powered off.
Activity light
The Activity light flashes when the printer is receiving or transmitting data over the
Ethernet connection.
State of the Activity light State of the printer
Flashing
Receiving or transmitting data over the Ethernet
connection.
HP Deskjet 6800 series printer User's Guide
53