Apple AirPort Extreme 802.11n (5th Generation) - Manual (Page 11)

11 Chapter 1 GettingStarted
Important: Use only the AC adapter that came with your AirPort Extreme.
When you plug the AirPort Extreme AC adapter into a power outlet, the status light
flashes green for one second, and then glows amber while it starts up. After it has
started up completely, the status light flashes amber until your AirPort Extreme has
been updated with the correct settings. The status light glows solid green after your
AirPort Extreme is properly set up and connected to the Internet or a network.
When you connect Ethernet cables to the Ethernet ports, the lights above them glow
solid green.
TheAirPortExtremeStatusLight
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 (in 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 29.
Solid amber AirPort Extreme is completing its startup sequence.