Closed User Group


Closed User Group

Im ISDN und in anderen Nachrichtennetzen können Teilnehmer zu einer Teilnehmerbetriebsklasse (engl.: user group) zusammengefasst werden und verfügen dann dieselben Merkmale hinsichtlich ihrer Möglichkeiten, Verbindungen in diesem Netz aufzubauen. Bei geschlossenen Teilnehmerbetriebsklassen (engl.: closed user group, CUG) können die zugehörenden Teilnehmer nur untereinander Nachrichtenverbindungen unterhalten. Teilnehmer einer offenen Teilnehmerbetriebsklasse können mit allen Teilnehmern verkehren, für die keine Beschränkungen gelten. Beschränkungen können auch hinsichtlich der Verbindungsrichtung gelten. So können beispielsweise nur abgehende Verbindungen oder nur ankommende Verbindungen erlaubt sein.
Ein Teilnehmer kann auch mehreren Teilnehmerbetriebsklassen angehören, so dass einer, der einer geschlossenen angehört, auch die der offenen erreichen kann.


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