2010-10-26
Network Design and Engineering Guide
89
Outdoor Unit and Satellite Link Design
SkyWAN
®
Link Budget Calculation Tool
Step (3)
For each network up to 20 earth station parameter sets may be defined:
- “Location”: Each earth station is identified by a unique location name. The first
column is reserved for one master station, because the home channel of this sta-
tion is fixed to carrier 1. For star networks, the first two columns represent the net-
work’s hub stations, the remaining stations are considered the remote terminals
of the network.
Figure 3-15
Link Budget Tool - Define Network
- ITU-T ’Rain Zone’.
- ’Longitude’ and’“Lattitude’: Geographical coordinates (positive values means
northern/eastern hemisphere).
- ’Uplink/Downlink Pattern disadvantage’: To be taken from the satellite footprint di-
agram. Stations in the beam center have a disadvantage of 0 dB, for other sta-
tions the difference between maximum and actual G/T or EIRP has to be entered.
- ’Antenna’: type according to the defined frequency band of the network the pull-
down menu allows the selection of any antenna type defined in the Ku- or C-Band
antenna sheet before.
- ’Output Backoff’: The difference between saturation power and maximum usable
output power of the station’s amplifier.
- ’Number of IDUs at location’: the number of IDUs which are connected to the sta-
tion’s ODU.
- ’Altitude’ of geographical station position.
- ’
Sky
WAN
®
Receive Home Channel’: The carrier used for reception on the prima-
ry demodulator.
Output Back-Off
The output back-off is needed to prevent intermodulation created by operating the amplifier too
close to the saturation level. The necessary back-off is higher when more than one carrier is
transmitted at the same time. In the case of
Sky
WAN
®
stations this is only possible if multiple
IDUs are connected to the same amplifier. In this case recommended values for output back-
Summary of Contents for SKYWAN IDU 7000
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