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Satellite Internet Presentation

By Danny Atkins and Jonathon Liou Block 2

Dan liu

on 18 May 2010

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Transcript of Satellite Internet Presentation

This is a presentation
by: Danny Atkins
Jonathon Liou Satellite internet is a connection through geostationary satellites.

More specifically...
A+ Guide to Software book
www.qatarliving.com/node/879488 - Qatar
Cost It can cost up to $650 for equipment, plus another $40-$70 a month to keep the service. It may also cost money for installation. Keep in mind... while that does sound expensive
this may be some peoples only alternative to get internet. Satellite is the best when in remote locations. Such as moutains, deserts and what not.
Low Earth Orbit (LEO) satelites
Similar but slower internet
Covers extreme latitudes (polar regions) How it works
Sites use proxy servers and/or virtual private network servers at the Earth Station (at ground level). The Earth Station is configured to route all outbound traffic to a Quality of Service server
QoS server
Resource reservation control mechanism
Make sure no user exceeds their allotted bandwidth or monthly traffic limits Traffic is sent to an encapsulator in the satellite
Puts IP packets inside of DVB packets
DVB packets sent to DVB modem

Traffic then sent to a transmitter (BUC)
Block upconverter
Used in transmission of satellite signals
Converts a block of frequencies from a lower to higher frequency

Receive ONLY
For Internet Protocol (IP) multicast-based data, audio, and video distribution

One-Way Connections ~Both receives and transmits data
~Also uses IP multicasting technology
~Up to 5,000 channels can be sent simultaneously by a single satellite
Compressed format to reduce size of data and bandwidth Two-Way Connection Hardware (Outdoor Unit) Mounted satellite dish
Feed horn
Antenna used to convey radio waves between the transceiver and the reflector
Universal LNB
Low Noise Block converter
Receiving antenna for satellite reception
Feed line
Physical cabling carrying the signal to or from the antenna
More Hardware (Indoor Unit) DVB-S PCI card inside the computer
DVB external modem
RJ-45 Ethernet port
USB port connects modem to computer
Increase in popularity
Increased interest in both personal and business uses
Available almost worldwide
Used where terrestrial internet access not available
Rural areas
Sea vessels
Mobile land vehicles
Anyone in space
Who's using it? Where can you get it & what will it cost you. Price:
Varies with provider
Average in U.S. is about $50/month for 1Mbps of transfer

Firms offering two-way satellite internet:
StarBand, Pegasus Express, Teledesic and Tachyon
Available worldwide, so it can be used almost anywhere.
About 10 times faster than a normal modem
Can provide for more users at one time than dialup
Advantages Disadvantages Signal Latency
Delay between requesting data and receipt of a response
High latency due to signal having to travel an altitude of 35,786 km above sea level from the equator to Earth and back
Delayed as much as 250 to 900 milliseconds
More Rain fade
Precipitation in signal path can degrade signal
Line of sight
Usually a clear line of sight between dish and satellite is required
Slower download speeds than cable and DSL
More expensive The satellite remains directly above the equator. It also has the same orbit period as the Earth's sidereal rotaion period. Geostationary means: DVB: Digital Video Broadcasting
Open standard for digital video The signal is then sent to a receiving dish There are two ways of doing this: One-way connections
Two-way connections IP Multicasting IP multicasting is sending IP datagrams to a group of interested receivers in a single transmission
Most IP protocols won’t work over one-way connections, since they require return channel, as in two-way connections
Can still view internet content but with limited interactivity One-Way Connections
Full transcript