Very Small Aperture Terminal (VSAT) Communication Networks
Introduction
Very Small Aperture Terminal (VSAT) communication networks are a form of satellite communication where business and industry can transmit data, voice and video around the world through a satellite link. Companies such as Walmart use VSATs to process data to and from their stores nationwide (Lawton, 1994). Understanding the basics of what constitutes a VSAT network and how it operates will establish a basis of knowledge to expand on the various applications. Illustrating the commercial and military use of these satellite networks will show how space capabilities can be more advantageous over terrestrial methods of communication. The use of VSAT communication is growing around the world. While few may understand even the basics of how they work, a better understanding of its operations, advantages, disadvantages, and many uses may prove to be beneficial as these space communication technologies unfold.
How VSAT Networks Operate
VSAT networks have very few components, and the system operates independently once it is set up. Each network location uses an antenna and a modem to link to a satellite using radio frequency (RF) bandwidth and various protocols. VSAT networks can be arranged in a mesh topology configuration or a star topology configuration.
A basic VSAT network consists of at least two antennas (usually 1.8 to 2.4 meters in diameter) and two modems placed at two separate distant locations. A modem is an electronic component normally consisting of two parts: a transmit/receive portion and a router portion for signal distribution. J. Reasoner, a VSAT network engineer, described modems stating “the term modem itself describes it’s tr...
... middle of paper ...
...4
699201&sid=3&Fmt=3&clientld=97487&RQ T=309&VName=PQD
Financial Express. (2011). VSATs are a natural fit for rural markets. Retrieved from
http://csuproxy.egloballibrary.com/login?url=http://proquest.umi.com/pqdweb?did=2242
605941&sid=3&clientld=97487&RQ T=309&VName=PQD
Goldstein, H. (2010, March). Satellite internet access withstands haiti quake. IEEE Spectrum.
(47)3, 11.
Lawton, G. (1994, June), Deploying VSATs for specialized business applications.
Telecommuncations. 28(6), 27.
Maral, G. (2003). VSAT networks. West Sussex, England: Wiley & Sons, Ltd.
Rosenberg, B. (2009). VSAT proves crucial to battlefield communications. Retrieved from
http://defensesystems.com/articles/2009/06/10/c4isr-two-vsat.aspx
Vittor, S. (2011). New VSAT network for african banks. Retrieved from http//www.
Vizadanetworks.com/blog/new-vsat-network-for-african-banks/
Although many people could say that it would just be a waste of time because of the other military development failures, the national budget is shrinking. In the late 1990s, the U.S. government started work on a new type of spy satellite. The project cost U.S. taxpayers billions of dollars, but none of the satellites were built. The reason for t...
Wireless networks – While the term wireless network may technically be used to refer to any type of network that is wireless, the term is most commonly used to refer to a telecommunications network whose interconnection between nodes is implemented without the use of wires, such as a computer network. Wireless telecommunication networks are generally implemented with some type of remote information transmission system that uses electromagnetic waves, such as radio waves, for the carrier and this implementation usually takes place at the physical level or “layer” network.
Mission Control in Houston, Texas, are up against a spacecraft 200,000 miles away from Earth
NSSS states a few current trends in space as being “congested and contested” (NSSS, 8), which is shaping our space strategic environment as well as fueling debates for space weapons. “Congested” trend refers to the current “60 nations and government consortia that own and operate satellites and the expectation to have 9000 satellite communication transponders in orbit by 2015.
Launch of the herms in 1976 was world’s first direct to home experimental telecommunication satellite.
Steele, Lisa J. "The View From on High: Satellite Remote Sensing Technology and the Fourth
Bakos (1991) defined the electronic marketplace as an “inter-organizational information system that allows participating buyers and sellers to exchange information about prices and products offerings” (p. 296). Airbus is teaming up with OneWeb to produce several small satellites to develop innovative designs and processes that aims to deliver affordable internet access across the globe. OneWeb’s objective is to transform space and connect the world. The space sector is indicative of the changing face of the aeronautical industry, with a growing number of non-traditional players transforming the landscape and the Airbus Group is at the forefront of this transformation. This will in turn dramatically lower the cost in large volumes for high performance space applications. As far as the marketing strategy for this goes, AirbusWorld is a secure internet portal providing their customers with an entire range of online services from a single point of access. It meets their customers’ expectations in terms of technical documentation, brochures on Airbus products, news and future technical
Modems are utilized to transmit digital data by means of simple analog system. "Modem" is gotten from the expression "modulator-demodulator." The fundamental elements of a modem are to modulate an analog carrier signal to convey digital data; and to demodulate a comparable signal to decode the digital data from the analog carrier signal.
In this topology, all nodes are connected to a central device, usually a hub or a switch. Each connected device has a dedicated, point-to-point connection between the device and the hub. The star network topology is by far the most widely implemented topology in use today.
A communications network can provide many types of service. The most basic type of service is known as simplex. This service provides one-way communication. Examples of this type of service are TV distribution, and the transmission of burglar alarm messages.
TVS and telephones are using satellites, and I thought it would be a good idea
This report will describe the two forms of data communications in terms of the physical interfaces and modes of operation. It will describe the features of data communications equipment in relation to synchronous and asynchronous communication including modems, network terminating units and sending and receiving equipment.
Mesh, Bus, Ring and Star topologies. The term topology refers to the physical or logical shape or layout of a network. Communication between different nodes within a network is determined by its topology. Mesh, Bus, Ring and Star are four of the most common network topologies, each with advantages and disadvantages in relation to each other.
An example of a communications satellite is the EchoStar 3. It is used to send TV signals to homes in North America. For this simple use of broadcasting TV through these technical machines, there are over one hundred communications satellites orbiting earth today. Communication satellites are also used as relay stations in space. People use them to bounce messages from one part of the world to another. These messages can be telephone calls, TV pictures, or even Internet connections. Many communications satellites have footprints. Communication satellites like the EchoStar 3 are in a geosynchronous orbit. This means that the satellite always stays over one spot on Earth. The area on Earth that it can see is called the satellite's footprint. For example a footprint that covers all of Africa can be used by one person to send a message to another person in Africa. One could also use communications satellites as relay stations to send messages to people over a system of satellites with many footprints.