COTS implementation of satellite-based, full-mesh multimedia networks

This paper describes a commercial-off-the-shelf system that uses satellite technology to provide one-hop, full-mesh, multimedia connectivity for widely dispersed networks. The virtual integrated sky network (VISN) combines low-cost, time division multiple access (TDMA) Earth station technology with cell-based switching technology, to provide networks that can connect hundreds of sites. VISN is a product and service offering of Orion Network Systems. VISN employs statistical multiplexing at both the site and TDMA carrier level to ensure efficient use of space segment. Statistical multiplexing enables sites with momentary surges of activity to “borrow” bandwidth from less busy sites. VISN guarantees bandwidth for sites with critical file transfers and voice calls. VISN provides roof top to roof top connectivity eliminating the “last mile” problem inherent in the use of terrestrial communications. VISN supports frame relay, Ethernet, and analog and digital voice inputs. The current version of VISN can support up to 50 nodes on a two megabit TDMA carrier. A future version of the system will be able to support up to 8, two megabit carriers and up to 254 nodes in the network