24 Network Design and Engineering Guide 2010-10-26General Carrier DesignEssential SkyWAN ® Satellite Link Layer FeaturesFigure 2-5 Data Reception ModesReception ModesIn principle a SkyWAN® station can operate in any kind of topology. However, to be able tocommunicate with more than two other stations in the network a ’Regular Data Reception’(RDR) license is required. Hence the peer and hub stations represented in the figure wouldneed an RDR license, whereas the star terminals could run with the default ’Limited Data Re-ception’ (LDR) license. The LDR license would still be sufficient if the star terminals have tocommunicate with two hub stations.i The restriction imposed by the LDR mode does not apply to node manage-ment via IP based protocols (SNMP, FTP, Telnet). It is therefore possible tomanage the star terminals by a network management station which is notconnected to the hub but to one of the peer stations.In LDR mode user traffic between a peer station and a star terminal is how-ever not possible.
