Articles

MOSA has Momentum

February 26, 2021

Published in New Electronics
Written by Paul Garnett

The last couple of years have seen the US and UK military adopt open architectures as the preferred alternative to custom and proprietary electronics technology designs. The Commercial-off-the-Shelf (COTS) Initiative was first introduced in 1994 but, arguably, the real paradigm shift took place in 2019, when the U.S. DoD issued a memorandum mandating the use of the Modular Open Systems Approach (MOSA) for all weapons systems going forward and which was then made law, requiring all defence acquisition programs (MDAP) to be designed and developed using a MOSA.

According to the DoD, the use of MOSA solutions will “support a more rapid evolution of capabilities and technologies throughout the product life cycle through the use of architecture modularity, open systems standards, and appropriate business practices.” Among the MOSA-related open systems standards supported by COTS suppliers are the module, backplane and chassis standards defined by the VITA trade association, including 3U and 6U form factor OpenVPX (VITA 65) board and backplanes, the C5ISR Modular Open Suite of Standards (CMOSS), and the Sensor Open System Architecture (SOSA), currently working towards its rev. 1 release, sometime this year.

The move to MOSA is driven by the fact that each new capability or function that’s added to a platform is a complete system with its own subsystems, the duplication of physical and logical components increases complexity and costs. It’s an unsustainable approach, especially as platforms and budgets continue to shrink in size.

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