 Our
clients own a VSAT (teleport) facility because they need Internet
connections or reliable telephone service. Some clients need both. The
correct selection of equipment, and purchase of bandwidth (space segment)
depends upon the type of use that it will be put to. Choice of
modulation and coding are important to minimise monthly costs. Satellite operators provide two types of frequency to choose from. Each has their advantages and disadvantages. Ku band provides very high frequency transmissions well suited to TV transmission or credit card validation applications. C band a lower range frequency better suited to voice and ISP needs. Each system has advantages and disadvantages. Ku band can have much higher signal strength in areas of spot beams; this means that a signal can be received on much smaller dishes (antennas). Antennas of 1m diameter are often used for Ku transmissions. The downside to Ku is that bad weather can cut off the transmission, leaving your clients without service until the rain and clouds vanish.  Our
clients all use C-Band because they are providing continuous voice or data
service to a client base. C-Band is much less subject to rain fade; the
downside is that is does require a larger antenna. Our smallest systems use
a 2.4m antenna; many of our clients chose a larger 3.8m in order to allow
for growth. |
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