The authors defines multiple-access method suitable for a centralized multiple satellite network, with onboard processing in the central node. This multiple-access method (CDMA/Aloha/BFN) is a combination of code-division multiple-access (CDMA), random multiple access (RMA) or Aloha, and a set of electronic beam forming networks (BFN). CDMA/Aloha/BFN multiple access maintains the advantages of CDMA and RMA techniques and avoids their disadvantages by using some processing on board the central satellite stations. The major characteristics of this method are: no need for network synchronization resistance to jamming, efficient use of the available system power and bandwidth, low equipment complexity, low mutual interference, ability to operate in systems supporting highly dynamic users, and good delay-throughput performance. The theory of operation of the CDMA/Aloha/BFN multiple-access technique is described and its performance is analyzed.>

Advances in satellite technology in the area of very small aperture terminals (VSATs) offer economical data and voice services for corporate networks and rural applications. The authors describe VSAT application and technology with emphasis on analyzing the issues of quality after the sale. The quality and maintenance requirements of the VSAT networks in operation are defined. The reliability, maintainability, and availability calculations for VSAT networks with different topologies are evaluated. Results show that both star and point-to-point VSAT networks are capable of meeting higher availability standards.>