A landline optic fibre data link connects the hub antenna to the customer head office. The hub antenna and the VSATs are owned, operated and maintained by a VSAT service provider who provides a communication service to the customer company. The VSAT service provider leases satellite capacity from a satellite operator. One hub antenna might thus serve several thousand VSAT antennas. Capacity is not a problem with both very small to very large networks all viable.
Growth is possible in small steps thus keeping costs related to actual useage.
Most VSAT systems provide a data service but voice to and from the hub is also possible. VSAT systems are attractive where the coverage area is large, where quick installation is required and where terrestrial alternatives are difficult to organise.