I would be inclined to suggest that on a college network you get a cheap router (ones designed for cable NOT ADSL) whose External IP address should be set to the assigned address (DHCP will pick one up automatically if not static from the college) and leave the router to assign internal addresses via DHCP. They normally include a switch but you could alternatively use the existing one.
If you have statically set an IP on the humax based on an assigned from the college IP on your PC then there may be IP conflicts on the college network.