The Space USB consortium is pleased to release the final project video, presenting the results achieved over the course of the project and showcasing the development and validation of the Common Passive Interface (CPI). As in-orbit servicing and assembly progressively become operational realities, one of the key challenges remains the lack of interoperability between existing standard interfaces. Today, major European interface concepts – including HOTDOCK, SIROM and iSSI – have been developed to address specific mission needs. However, ensuring compatibility across platforms is essential to enable modular and serviceable space infrastructures. To address this challenge, Space USB designed the Common Passive Interface (CPI) – a standardised mechanical and functional envelope intended to ensure interoperability between different servicing interfaces. The final video illustrates:

• The context and need for standardised in-orbit interconnections;
• The design and architecture of the CPI concept;
• The laboratory testing campaign performed with each of the three major European standard interfaces;
• The demonstration of full mechanical and electrical compatibility;
• Additional validation in an Orbital Replacement Unit (ORU) configuration.

The successful testing campaign confirms that a common interoperability layer is technically feasible and can support future applications in docking, refuelling, robotic servicing and modular orbital assembly. The CPI specifications can be made available upon request, in line with Space USB’s objective to initiate an open and collaborative standardisation process within the European space ecosystem. This final video marks the conclusion of the project under the Horizon Europe programme (Grant Agreement n°101135215) and reflects the strong commitment of the consortium to advancing sustainable, interoperable and serviceable space infrastructures.