I wanted to connect a non-wireless device (an Xbox 360) to a spare AirPort Extreme Base Station (AEBS) via ethernet cable, then join the Airport Extreme to an existing wireless network created by a non-Apple (D-Link) wireless router. After much searching, it appears that the ethernet ports on the AEBS will not function when the AWD is connected to a wireless network created by a non-Apple device, such as a D-Link wireless router.

But, I was able to find lots of useful links, which I’ve posted here for future reference.

Default AirPort Base Station passwords are “public.”

Resetting an AirPort Base Station or Time Capsule FAQ (with pictures of the different models)
http://support.apple.com/kb/HT3728

AirPort Utility 5.5.3 for Windows
Post Date: June 14, 2011
http://support.apple.com/kb/DL1391

Time Capsule and AirPort Extreme Base Station Firmware Update 7.5.1
Post Date: March 31, 2010
http://support.apple.com/kb/DL965

AirPort Extreme Firmware Update 5.7 for Windows (AirPort Extreme 802.11g – drop shaped)
Post Date: January 03, 2006
http://support.apple.com/kb/DL411

All about Time Capsule, AirPort Extreme, and AirPort Express base station firmware updates
http://support.apple.com/kb/HT1218

To download and install any available firmwares on your AWD, simply open AirPort Utility. An alert indicates that an update is available (if one is). Click the Update button. If you are updating more than one base station, click Show Details to select the base stations you want to update.

AirPort + Time Capsule (General support page)
http://www.apple.com/support/airport/

Using the AirPort Admin Utility to create a WDS network with multiple base stations
http://support.apple.com/kb/HT4262

AirPort Extreme Base Station Setup Guide
http://manuals.info.apple.com/en/airportextremebasestationsetupguide.pdf

AirPort: Slow 802.11n connection speed when connected using older WEP or WPA security mechanisms
(Use WPA2 Personal authentication)
http://support.apple.com/kb/TS3361