Chapter Twelve. Spaceway and the Global Broadcast Service

Most of this book has been about direct broadcast satellite (DBS) communications. This is a telecommunications broadcast medium that is called a point-to-multipoint transmission. In other words, a single uplink (Castle Rock, Colorado, for DIRECTV; Cheyenne, Wyoming, for EchoStar; and so on) transmits to millions and potentially tens of millions of receivers in the United States. However, there is no way for the subscriber to communicate back with the uplink.

Note that there is a communication capability in the IRD (see Chapter 11) for the report-back feature. However, this is controlled by DIRECTV and not the subscriber. Further, the communication is very asymmetric; the communication ...

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