2010-10-26 Network Design and Engineering Guide 73Outdoor Unit and Satellite Link DesignIntroduction3 OUTDOOR UNIT AND SATELLITE LINKDESIGNIn the previous chapter ’General Carrier Design’ we discussed how to derive optimized Sky-WAN® TDMA carriers from user traffic requirements. In this chapter we discuss how to performlink budget calculation for SkyWAN ® networks using the ND Satcom Link Budget tool and howto optimize links and the outdoor equipment of earth stations.The next steps in the engineering process are- the choice of a suitable satellite rsp. satellite transponder(s) and- an optimized outdoor unit design.3.1 IntroductionThe general principle of the satellite link and outdoor unit design may be summarized by thefollowing steps as shown in figure 3-1.Figure 3-1 Steps for Outdoor Unit and Satellite Link DesignSelect Satellite TransponderStart with selecting a suitable satellite transponder (task B1 in figure 3-1). The necessary inputfor this task are- the geographical location of the earth stations- information about footprint disadvantages like rain fade or the coverage of the satellitetransponder beam.
