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This paper describes the Reliable DBS Multicast Protocol (RDMP) and an initial set ofresults analyzing its performance. This protocol has been developed to facilitate the integration of Direct Broadcast Satellites (DBS) into the Digital Battlefield including the interconnection with in place tactical networks. Its key features are: S minimal return link traffic such that it can operate over a variety of return links, . seamless interconnection with terrestrial networks using Internet Protocols for data ingest and distribution, . scalability to accommodate large populations, . use of a proxy to provide the interconnection of the DBS link with terrestrial wireless networks, . interface with legacy systems that support FTP and TCP, but require reliable multicast services.This paper describes RDMP in terms of its ARQ, flow control, synchronization, and recovery capabilities.The goals and requirements for RDMP to support reliable multicast in the Digital Battlefield are presented in Section 1 while its capabilities are described in Section 2. Then the RDMP implementation concept is presented in Section 3 followed by the quantitative performance results in Section 4.Keywords : multicast, direct broadcast satellite, Internet, transport protocol As shown in the figure, the high capacity DBS will interconnect an Injection System with DBS Field Terminals (DFTs) located in the battlefield while the low capacity LEO provides the return link via a backhaul link. The Author's email address: walters.david@orbital.com, telephone: 301-428-6472 SPIE Vol. 3393 • 0277-786X/98/$1O.OO 133 GEO DBS BCF= Broadcast Control Facility DFT= DBS Field Terminal ULF = Uplink Facility AP = Applications PlatformFigure 1: System Architecture