In May 1994, the Committee for Operations and EGSE Standards (COES) of the European Space Agency (ESA) issued the Packet Utilisation Standard (PUS) in the ESA internal PSS standards system. The intention was to promote standardization and the re-use of on-board and ground systems by defining a standard application-level interface between space and ground. Since that date, two major developments have occurred that are relevant to the PUS:The PUS has been used, to varying degrees, by a large number of missions and is currently being adopted by virtually all future ESA missions.The European Cooperation for Space Standardization (ECSS) was established with the mandate for production of space-related standards and the PUS has been thoroughly reviewed and improved by the ECSS Working Group for "Ground Systems and Operations". It will be published soon in the E-70 branch of ECSS.The PUS revision has been completed and this paper presents the improvements and extensions introduced in the new PUS (ECSS-E-70-41). In addition, tools aimed at easing the work of users of the ECSS PUS are being developed and are presented in this paper.
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