This document defines general system architectural philosophy and specific design guidance for the design and interface of various cabin related equipment. System performance parameters are described for connectors, electrical interfaces, operational mode control/protocols, BITE reporting, reliability, environmental conditions, and software data loading. Supplement 7 defines an IEEE 802.11n compliant Cabin Wireless Access Point (CWAP) suitable for installation a wide variety of cabins. It also provides an update to the digital overhead monitor mounting provisions and connectors for compatibility with the CWAP definition.