All main college sites and virtually all university buildings are linked by optical fibre cable to the University Network. Some outlying buildings, such as BSF Swindon, Tubney and Wytham Field Stations rely on either a microwave link or a 3rd party IP connection.
This connection would terminate on a FroDo, assuming you were connecting directly to the University backbone (Odin) as most units do.
If you wish to investigate the options available to install a data network connection to a particular property please contact Network Operations at networks@it.ox.ac.uk.