VSAT or Very Small Aperture Terminal. In short, there are three main components of VSAT Technology – the satellite, a central hub (with a big dish antenna) and a number of smaller nodes (smaller dish antenna) kept at various remote locations. Collectively they form a Star topology (even mesh topologies are possible for small networks) using the satellite network. Essentially all the nodes communicate with the central hub through the satellite as the medium for communications. In case additional networks (Internet, terrestrial MPLS, etc) need to be integrated with the VSAT network, it can be done at a NOC (Network Operations Centre) located at the central hub.
Lately, the Geo-Synchronous satellites are used more for WAN/broadband Internet connectivity as it has the ability to provide a permanent coverage over a fixed area. After C- and Ku- bands, it is the Ka- band which is hogging the limelight for its high throughput performance capabilities (excess of 100 Gbps per satellite).