The purpose of this recommended practice is to establish the design principles, and parameters and testing methods for verifying HDMI connections throughout AV systems, thus ensuring robust and reliable performance. Systems may include passive or active HDMI cables, and HDMI connections utilizing alternative transport technologies. CEDIA/CTA-RP28 identifies features and protocols of HDMI that are complex, and defines test procedures to ensure the integrity of HDMI systems. This document also acts as a reference for common AV and HDMI terms and definitions, defines AV acronyms, and provides the tools and steps that are needed to troubleshoot these systems.