VSAT: Satellite communications

Type :

Term papers

Pages :

29 pages

Format :

.doc

Published date :

04/15/2009

Category :

Science & technology

Sub category :

Physics & chemistry

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Summary :

Introduction
A report on the review and assessment of satellite technologies
An introduction to VSAT or 'Very Small Aperture Terminal'
Typical applications for interactive VSAT networks
Band frequencies
1. The C-band
2. The Ku-band
3. The Ka-band
Network topologies
Access technologies
An overview of the technology
Signal types and characteristics
The link budget
The management and the control
The future of VSAT networks
Conclusion

Abstract

This report provides a review and assessment of satellite technologies for providing broadband data communications using Very Small Aperture Terminal (vsat) network systems. In this context, "broadband" means that the application requires a data transfer rate greater than 100 kbps and should allow broadcast, multi- and uni-cast, and interactive bi-directional services to fixed locations worldwide. The applications considered are: Internet access over satellite, digital content distribution, wide area network (WAN) connectivity, video teleconferencing, distance learning, and telephony. The systems examined include digital video broadcasting (DVB) with IP (Internet Protocol) encapsulation, and bi-directional vsat star networks. Detailed comparisons of various transmission parameters are provided to help evaluate currently available satellite and ground equipment capabilities. The report also gives the overview of the LINKSTAR technology, a new two-way broadband satellite communications system for (IP) connectivity over satellite. LinkStar is the highest performance star based vsat system for service providers. LinkStar's edge is in its dynamic bandwidth allocation that makes it more efficient and faster than other TDMA systems. Terminals can transmit data to the network hub at speeds up to 1.15 Mbps with data downloads of upto 60 Mbps, satisfying bandwidth intensive applications using IP data. vsat stands for "Very Small Aperture Terminal" and refers to receive/transmit terminals installed at dispersed sites connecting to a central hub via satellite using small diameter antenna dishes (0.6 to 3.8 meter). vsat technology represents a cost effective solution for users seeking an independent communications network connecting a large number of geographically dispersed sites. vsat networks offer value-added satellite-based services capable of supporting the Internet, data, LAN, voice/fax communications, and can provide powerful, dependable private and public network communications solutions.