This document defines the electrical characteristics, protocol and data content for a data bus used with cabin electronics equipment. This document defines a mandatory command set and an optional command set.

This document describes functional requirements of the head end equipment as they relate to the communication over the bus. However, this document is not a complete functional specification of the head end equipment.

This document does not define the equipment environmental requirements. This document does not define the physical description of the equipment. This document does not define the IFE system architecture, design, or operation.