The two satellite communication protocols DVB-S2X/RCS2 and 3GPP 5G-NR NTN have quite different origins and have been developed considering quite different market needs and user requirements. DVB-S2X has been optimised specifically for broadband transmissions overa satellite communications channel, whilst 5G-NR is strongly influenced by the performance of handheld user devices operating at lower frequency bands in a terrestrial cellular network topology. By its nature, the current version of the 5G-NR protocol is the result of compromises with the larger 3GPP community. It is therefore expected that the satellite-specific DVB protocol will outperform the more universal 5G-NR protocol in many operational satcom scenarios, but without the advantages of broader network compatibility.The intended activity will therefore help develop an understanding of the relative performance of the two protocols across the range of system scenarios and operational conditions used to support the full range of satellite communications services and help determine which protocol is likely optimum in each operational system. The activity outcomes are intended to serve as an impartial reference to help system architects, service integrators, and technology developers optimise their future offer, as well as potentially contribute to future discussions within the 3GPP process.