What do the different WiFi light indicators mean on the DCP-B7500D?

When the WiFi light is on, your Brother machine is connected to a wireless access point. When the WiFi light blinks, the wireless connection is down or your machine is in the process of connecting to a wireless access point. To set up a wireless connection, press the WiFi button and launch the wireless installer on your computer, then follow the on-screen instructions. (Page 8)