Linksys BEFCMU10 Ver. 1
Power Red - Modem has Power
Off- Check Power cable, no power
Activity Solid - Ether/USB Connected
Flashing - Activity over the Ethernet/USB Connection
Off - No Ethernet/USB Connection detected
Cable Flashing - Data going over cable network
Off - No Data Being Transmitted
Status Solid - Modem is Online
Flashing - Modem is attempting to come online
Off - Modem Error
Manuals and Support Information

Manual
Manufacturer Site
USB Drivers