I have recently had to move and set up my Mac system again. Do you need to have your broadband working prior to setting up the Time Capsule?
yes I never connect to broadband it no wrok too..but another wrok( 2 laptop)
If your Time Capsule is setup to run it's own network (provide IP Addresses via DHCP) you don't have to be connected to the broadband.
Otherwise you can use the AirPort Utility to change this setting.