Airport Utility says Mac connected to unkown Time Capsule

Hi,
I have an issue with Airport Utility (6.3.2) and a Time Capsule in my local network. This is happening at work where I have an iMac connected to the local LAN via an Ethernet connection. Wireless airport is switched off. When I open Airpot Utility, however, it shows my computer connected to a Time Capsule somewhere in my local network. See the image below.
None of my colleagues, nor the system administrator, knows to whom that Time Capsule belongs to nor were it is located. If I go to System Preferences > Network and I disable the Ethernet port ("Configure IPv4", select "Inactive") my internet connection is gone, but Airport Utility still shows the Time Capsule as connected to my iMac.
The only manner in which Airport Utility will show the Time Capsule disconnected is by unplugging the Ethernet cable.
So, I have a few questions because I could not find the answers anywhere and my system administrators have no idea what is going on (they are specialised in Windows environments):
1) The fact that Airport Utility displays a green light on the Time Capsule does it mean it is connected to my computer? If so, how can I disconnect it? Clicking on the Time Capsule icon I am asked for a password I obviously don't know. So I cannot acess its configuration pane.
2) How do I know if there is any data traffic between my computer and the Time Capsule? I cannot find out its IP or MAC addresses (Airport Uitility will not show them to me).
3) Is it possible that the internet traffic of the owner of the Time Capsule is being re-routed through my computer? My internet connection is indeed more unstable and slower than that of my colleagues (using Windows or Linux) but I can't figure out why.
Thank you.
iMac 21" (Late 2012, iMac13,1)
Mac OS X (10.9.5)
Airport Utility 6.3.2

1. It isn't connected, but Airport Utility sees in on the network.
2. There shouldn't be any data traffic unless you initiate it.
3. Highly unlikely.

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