cyril7: Hi can you photo the specifics of the black coax modem, it looks like a One NZ technicolor but we may be wrong and it's a simple P2P ethernet over coax extender as others have suggested.
Cyril
ANglEAUT:
The white box is definitely a FWA / RBI modem.
Disconnect the yellow cable & see if the other Ethernet ports throughout the house loose their internet connectivity?
Garage, office, Harry Potter type cupboard under the stairs of a HWC cabinet are likely places for the central Coax connection. If you are unlucky, it might even be in the roof.
Unfortunately I can't because the previous owners took the equipment with them. I haven't found that central location for coax or ethernet so far. Will there always be a central location (even if it's hidden eg. in the wall)? Is it possible for all sockets to be wired to one socket or are they always one to one (which is what I had thought should be the case)?

