Rural Wings Training

Satellite Communications System Overview

Why satellite?

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7EL=0°EL=5°

EL=15°

EL=30°

EL=45°

S1

+52

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Ñ

WC

N

BAS service on S1 beamof IS-903@325.50°E.D/L Beam Pointing: 4.15°E; 6.92°N

TW T Power: 101.6 Watts.

Map of Receiver Antenna Size forDIG(41.5Mbps,OH=0.0Mbps, 3/4FEC,RS=188/204,QPSK)

(30.0 MSym/s) carrier withservice availability >= 99.50 %/yr.

0.75 m.

0.9 m.

1.2 m.References

Fri Dec 15 18:15:26 2006 \ pc5h114-2

Some characteristics of satellite– can be rapidly deployed beyond the terrestrial networks

– offers high bandwidths such as 2Mbps/512Kbps (asymetric is typical though not mandatory

– suits most situations, including data distribution, Internet, streaming, voice

– has inherent broadcast/multicast capabilities

– requires some care in installation

– is less used for highly interactive applications like gaming

Equipment - Outdoors

Satellite Dish & Transmitter

Wireless Antenna Omni-directional

Wireless Access Point

Equipment - Indoors

PC / LaptopSatellite ModemRadio Receivers

Connections

Coaxial

To the Internet

Satellite GatewayLocal Users

Wifi Connections

Satellite Hub

London

Host

Bewholme

Home

Bewholme

How does it work?What happens when you type a URL <CR>?

Server

Australia?

Request sent by satellite

Request sent by wifi

Request sent by cable

Page received by wifi

Page received by satellite

Page received by cable

Flexibility

+ Games terminals

Standards & Safety

– The equipment complies with all relevant standards and safety requirements

– These are too numerous to mention but are available on request

Performance

– What can you do with 1 Mbps

• Time to download a photo• Etc

– Sharing Bandwidth

• Don’t always see top speed• Shared just like ADSL• Use it at non-popular hours

– Characteristics

• E.g. batched surfing