Motorola SB5120
Power On - Modem powered up
Off - Modem does not have power
Flashing - Modem starting diagnostic startup
Online Flashing - Searching for network
On - Modem Online
Activity Flashing/On - Data being sent/received from modem
Standby On - Standy Button Pressed, Standby modem activated
Send Flashing - Searching for Upstream
On - Upstream Locked on
Receive

Flashing - Searching for Downstream
On - Downstream Locked on

Manuals and Support Information
Manual
Manufacturer Site