Linksys BEFCMU10 Ver. 3
Power Red - Modem has Power
Off- Check Power cable, no power
Cable On - Modem Online
Flashing - Searching for Network / Ranging
Activity Flashing - Data being received or transmitted
Ethernet On - Ethernet connected
Flashing - Data going over ethernet connection
Off - No Ethernet connection detected
USB On - USB Connection detected
Flashing - Data going over USB Connection
Off - No USB Connection detected
Manuals and Support Information

Manual
Manufacturer Site
USB Drivers