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Satellite Internet

Satellite Internet

The satellite internet is a wireless service that is extensively used in places which cannot be connected due to the non-availability of terrestrial internet access. It is also very popular among users of 'movable' locations.
Gaynor Borade
The wireless connectivity and instant access to connect anywhere in the world, has led technologists to now tap on the Internet access via satellite! This is a world wide availability that is being sourced and includes connectivity at sea and within land vehicles. The system basically comes in three types and all the variants use connectivity enhanced via the local satellite service. The connectivity thus possible has supported the businessman on the move and those professionals who regretted the lack of connectivity initially, due to geographical constraints. Now with this service, there is hardly any region on the planet that cannot be accessed via this technological wonder!

Connectivity Via Special Hardware

The Internet connectivity via satellite can be tapped through interface presence, like the telephone network that is 'public-switched', as in the case of the squawk box applications. In this case, a physical and separate Internet 'connection' is not required. The system operates with the support of a server-to-queue-data connectivity and includes a FTP or File Transfer Protocol. In the case of connectivity via system hardware components, the transmitting station or the teleport is supported by two important components.

The Internet connection is made possible when the ISP routers are connected to the proxy servers. This connectivity enforces the band-width limits of the QOS or 'quality of service', thus enabling user traffic. This connectivity is furthered to the DVB encapsulator and then, the S modem. The DVB-S modem then transmits a RF or radio frequency to the outdoor unit, through the up converter connected via a feed line. The system components also include a block up converter, an optional low noise block converter, an optional orthomode transducer, a feed horn, and a waveguide. This connectivity is routed to an Earth station, which is a setup that consists of an outdoor and indoor unit.

Connectivity Via Software

In the case of remote sites, most satellite Internet connections or one-way multicast applications need custom programming. This requires the dedicated software to be able to effectively filter, store, and offer access to a selection interface and data. The transmitting station also needs to incorporate special software to handle access control and queuing-sending-encapsulating of the data, on a priority basis. The remote sites require a programming back up to be able to provide authentication and take care of the proxy server settings essential to the operation. The filtering operation is provided by the DVB card driver, while the non-standard IP stacks address asymmetry and latency issues. The data is encrypted to be accessible to any satellite receiver.

The IP over satellite units usually incorporate proxy servers that are paired at the end-points and VPNs or virtual private network implementations. This is to ensure that communication between the clients and servers need not accept the inherent latency. The virtual private network implementations are designed for satellite links to handle long packet travel time. In connectivity via software components, the upload speeds are limited by the user's modem, and latency is high. The download speeds in such connectivity can be much faster than that in the case of dial-up.

Connectivity Via One-way Terrestrial Return

The satellite Internet connectivity via one-way terrestrial return uses the traditional dial up access. The system has out-bound data traveling through a telephone-based modem. However, downloads are handled by satellite. While a license is required for the uplink station, there is no such requirement for users. Another type of the same system incorporates the use of the General Packet Radio Service. This system enhances the back-channel by using a standard GPRS connection. The upload volume in this system is low and the service is charged by volume uploaded. This enables the users to surf and download at broadband speeds! The GPRS enables a mobility that transmits in the field of 50 to 53 dBW.

The mobile or satellite Internet connectivity that is broadband enhanced can be accessed with the help of the recommended satellite dish width, a note-book, and a GPRS-GSM telephone.