Space Systems MOSA Interface Standards Alliance


New Alliance Standard

The Space Systems MOSA Interface Standards Alliance is proud to announce the release of its first voluntary consensus developed Standard, MOSA-IF-S-002 “MOSA Payload Manager Interface Standard.”  This Standard focused on standardizing the bus/payload command and data handling (C&DH) interface using SpaceWire for low-speed transactions and Ethernet for high-speed information exchange.  With the growing need for higher and higher data rates, this bus/payload interface configuration was preferred over the initial release of the Standard (MOSA-IF-S-001), which specified SpaceWire and Serial Rapid IO.  Additionally, the development of MOSA-IF-S-002 drove associated changes in the connector pinouts specified in MOSA-IF-S-001 and spawned a subsequent update, MOSA-IF-S-001 w/ Change 1, for consistency with the contractor-preferred connector pin assignment.  Use of MOSA-IF-S-002 will modernize legacy C&DH designs and facilitate interoperability across space systems.

Who we are

The Space Systems MOSA Interface Standards Alliance is interested in rapidly developing modular open system approach (MOSA) compliant space system standards that will enable interoperability at key system interfaces. Collaborating with the Institute of Electrical and Electronics Engineers Industry Standards and Technology Organization (IEEE-ISTO) will enable the Space Systems MOSA Interface Standards Alliance to leverage agile development methods to expedite the standards development process.

The Space Systems MOSA Interface Standards Alliance is a government-guided collaboration with industry for the purpose of voluntary consensus development of space system interface standards, in accordance with Public Law 104-113, and OMB Circular A-119. Furthermore, in accordance with the MOSA laws specified in the 2015/2017/2022/2021 National Defense Authorization Acts (NDAA), the space system interface specifications will enable and foster interoperability at key system interfaces

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What We Do

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The Space Systems MOSA Interface Standards Alliance consists of committees and subcommittees developing interoperability standards that meet Enterprise-defined objectives.  The collection of standards developed by the alliance will synergistically support Enterprise objectives.  By creating standardized interfaces, the Enterprise seeks to benefit from a wider range of industry innovations and bring newer technologies to our warfighters faster.  Standardization will also enable and foster the ability of non-traditional companies to enter the established market.


The objective of the Space Systems MOSA Interface Alliance is to have multiple committees/subcommittees developing interface standards across all segments of space systems.  The Alliance will target a subset of interfaces within and across the Space, Ground, Launch, and User segments.

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