| The DoD Joint Internet Protocol Modem is based on the Digital Video Broadcast (DVB) standard. In a star network topology the forward traffic is DVB-Satellite 2 (DVB-S2) and the return traffic is DVB-Return Channel by Satellite (DVB-RCS). The Joint Modem adds an embedded TRANSEC capability and a mesh overlay allowing user terminals to communicate without passing through the hub. The analysis will take advantage of the Variable Coding and Modulation (VCM) feature [as well as the Constant Coding and Modulation (CCM) feature of DVB-S]. First, the DVB-S2 capacity will be determined for Wideband Gapfiller Satellite (WGS) located at 175° east using a set of reference links located in Korea using CCM and VCM in the forward direction. Then the capacity of WGS will be determined in the return direction using DVB-RCS. Finally, the mesh capacity will be determined using WGS with VSAT terminals (1m) in Korea for Voice Over Internet Protocol (VoIP) traffic. |