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The Joint IP Modem (JIPM) includes a forward (DVB-S2) and a return (DVB-RCS) link capability with a plethora of modulations and error correcting codes. In addition there is Variable Modulation and Coding (VCM), Adaptive Modulation and Coding (ACM) as well as uplink power control capability. The Wideband Global SATCOM (WGS) satellite has both Ka-band and X-band capability utilizing 39 active channels of up to 125 MHz bandwidth each. This paper addresses the JIPM hub/spoke topology at Ka-band and determines the constraints and requirements on the user VSAT terminals to support Global Broadcast Service (GBS) traffic.
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