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This Notice of Proposed Rulemaking (NPRM) seeks comment on revisions to the spectrum sharing requirements among non-geostationary satellite orbit (NGSO), fixed-satellite service (FSS) systems. The NPRM proposes that the Commission’s existing spectrum sharing mechanism for NGSO FSS systems will be limited to those systems approved in the same processing round. The NPRM also proposes to adopt a rule providing that later-round NGSO FSS systems will have to protect earlier-round systems, and invites comment on how to define such protection. In addition, the NPRM seeks comment on whether to sunset, after a period of time, the interference protection afforded to an NGSO FSS system because of its processing round status.