Bjarne Larsen can no longer use his Time Capsule because of a work-required router on his home network that blocks Time Capsule over Wi-Fi. The reason is that the Time Capsule has to have a network address in order to work on a network. You can fix this by giving a static private address to the Time Capsule and another static private address on the same network to the ethernet adapter you connect to it. Now you should be able to mount your Time Capsule drive in the Finder just like any networked drive.
Verify, repair, or erase an AirPort Time Capsule drive
How to Install and Setup Your Time Capsule - iClarified
Backing up important data is paramount to the security of your small business. Using Apple's Time Capsule, you get both a Wireless router for your Internet network and an external hard drive to backup data. You can either use the Time Capsule to create a new wireless network or add it to an existing network. Once connected, the Time Capsule works with Apple's Time Machine application to back up your data and give you peace of mind. Plug the other end into an open Ethernet port on your modem. Plug the Time Capsule's power cord into the device, plugging the other end into an open outlet.
How Do I Connect a Time Capsule Hard Drive To My Mac?
Your Mac will connect to your current internet and wireless equipment. They offer a few features not available in the PC world. Wi-Fi connects computers and other devices in your home or office without running wires. Macs can also use Time Capsule to make automatic backups with the Apple Time Machine backup software. In a normal installation, you run an Ethernet cable from the back of the Time Capsule to your high-speed Internet-connected modem: cable, DSL, or satellite.
The easiest way to use it was to buy a Time Capsule, a wireless AirPort router with a hard drive built in. Before Time Capsule, nobody backed up. After Time Capsule, anyone could keep hourly, daily and weekly backups without even thinking about it. Time Machine is fantastic.