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

written by admin \\ tags: VSAT

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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