Apple Time Capsule - Connecting to an Existing Wireless Network

Chapter 2 The Time Capsule on a Network 17
Wireless computers and computers connected to the Ethernet ports can also
communicate with each other through your Time Capsule.
Using Your Time Capsule on an Existing Wireless Network
If you already have a wireless network, you can connect your Time Capsule to the
network wirelessly or using Ethernet. Once your Time Capsule is connected to the
network as a client, you can set it up to use Time Machine in Mac OS X Leopard v10.5.2
or later to back up all the Mac OS X Leopard computers on the network.
Computers using earlier versions of Mac OS X, and computers using Windows XP with
Service Pack 2 or Windows Vista, can access your Time Capsule to share or back up files.
Note: If you’re using Time Capsule as a client on an existing Wi-Fi network, it’s
recommended that the existing network is an 802.11n network.