Apple AirPort Extreme 802.11n (4th Generation) - Manual (Page 11)

Chapter 1 Getting Started 11
When you connect Ethernet cables to the Ethernet ports, the lights above them glow
solid green.
The AirPort Extreme Status Light
The following table explains the AirPort Extreme light sequences and what they
indicate.
Light Status/description
Off AirPort Extreme is unplugged.
Flashing green AirPort Extreme is starting up. The light flashes for one second.
Solid green AirPort Extreme is on and working properly. If you choose Flash
On Activity from the Status Light pop-up menu (on the Base
Station pane of AirPort settings in AirPort Utility), the status light
may flash green to indicate normal activity.
Flashing amber AirPort Extreme cannot establish a connection to the network or
the Internet, or is encountering a problem. Make sure you have
installed AirPort Utility and use it to get information about what
might cause the status light to flash amber. See “If Your
AirPort Extreme Status Light Flashes Amber” on page 28.
Solid amber AirPort Extreme is completing its startup sequence.
Flashing amber and green There may be a problem starting up. AirPort Extreme will restart
and try again.
Solid blue The base station is ready to allow a wireless client access to the
network. See “Allowing Wireless Clients Access to Your Network”
on page 25.