Telenet

- The process of correctly sizing uplink and downlink paths.
- Takes into account:

• Established Satellite performance

• Path Loss (22,300 miles traversing space)

• Atmospheric effects (weather, ion storms, sunspots, etc.)

• Frequency bands used (Ku, C, Ka)

• Hub uplink antenna and amplifier performance

• Downlink antenna size and receiver noise figure

Link Budget Rain :

• Design for the specified availability

• 99.5% availability will give you about two days of outage per year

• 99.9% will give just 8 hours of outage per year

• Note that only the Uplink at the Hub can compensate for rain, by using the UPC

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Inbound Vs Outbound Transmission Characteristics :

Outbound

• Continuous output, bandwidth shared among remote sites receiving TDM frames
• Emphasis on inexpensive receiver/LNB
• High bit rate (up to 32Mbps)

Inbound

• Random access, transmitter bursts as required to communicate with the hub
• Emphasis on inexpensive modulator
• Medium bit rate (up to 2Mbps, with large scale VSAT)

There are many useful source of VSAT information at VSAT Asia and VSAT Name.

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