Multi-Source Agreement (MSA) standards are industry-driven technical specifications jointly developed by multiple leading manufacturers to define common form factors, electrical interfaces, optical interfaces, mechanical dimensions, and management protocols for optical transceiver. Multi-Source Agreement (MSA) standards are industry-driven technical specifications jointly developed by multiple leading manufacturers to define common form factors, electrical interfaces, optical interfaces, mechanical dimensions, and management protocols for optical transceiver. MSA (Multi-Source Agreement) standards define the mechanical, electrical, and management interfaces of optical transceivers, enabling multi-vendor interoperability, supply chain flexibility, and large-scale network deployment. Understanding MSA is critical for compatibility validation, cost. XPO represents a new class of optical pluggable module designed specifically for next-generation AI data center fabrics. By following these standardized guidelines, manufacturers can design transceivers that are mechanically and electrically compatible with networking equipment from other vendors. The IEEE (Institute of Electrical and. The core of an optical port switch 's interface lies in its optical modules, while the ports on the switch panel (such as SFP/SFP+/QSFP28 slots) are designed to accommodate these modules.