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对于在专用网领域内，卫星系统有希望与专用电信交换网结合，欧洲显示出新的浓厚的兴趣。总的来说，可为与专用电信交换网结合的卫星系统设想各种应用。基本应用是提供ＰＡＢＸ互连所必须的网络基础设施。第二种有吸引力的应用是在专用电信网（ＰＴＮ）中综合作为自主子网的卫星系统。在这种情况下，卫星系统可看作ＰＴＮ中的一个ＰＡＢＸ。与ＶＳＡＴ系统结合，连接远端或孤立的用户是一个典型的应用范例。另一个例子是可能与用于专用移动无线电网的移动卫星系统结合，在专用移动无线电网中，移动用户只能在同一专用集团内通信。本文论述了与上述可能应用相关的网络结构问题，同时概述了最佳的结合方式及相应的互通功能／协议。
Europe has shown a new interest in the promising combination of satellite systems with private telecommunication networks in the area of private networks. In general, a variety of applications are envisioned for satellite systems in conjunction with private switched telecommunications networks. The basic application is to provide the necessary network infrastructure for PABX interconnection. The second attractive application is the integration of satellite systems as autonomous subnets in private telecommunications networks (PTNs). In this case, the satellite system can be seen as a PABX in the PTN. Combined with the VSAT system, connecting remote or isolated users is a typical application example. Another example might be the combination with a mobile satellite system for a private mobile radio network in which mobile users can only communicate within the same private group. This article addresses the network architecture issues associated with these possible applications and outlines the best combination and corresponding interworking capabilities / protocols.