Apple AirPort Time Capsule 802.11n (4th Generation) - Manual (Page 19)

19 Chapter 2 SettingUpYourTimeCapsule
3 Follow the onscreen instructions to set up your Time Capsule and your wireless network.
The AirPort Utility setup assistant asks you questions about the type of network
you want to use and the services you want to set up, and helps you enter the
appropriate settings.
If you’re using your Time Capsule to connect to the Internet, you need a broadband
(DSL or cable modem) account with an Internet service provider (ISP), or a connection
to the Internet using an existing Ethernet network. If you received specific information
from your ISP (such as a static IP address or a DHCP client ID), you may need to enter it
in AirPort Utility. Have this information available when you set up your Time Capsule.