The purpose of this specification is to define the general Galley Insert (GAIN)standardization philosophy, provide comprehensive equipment interfaces, and disseminate the most current industry guidance. Part 1 covers the Controller Area Network (CAN) data interface attachments, envelopes, and data content to be considered between all galley equipment using a Galley Data Bus as described within this specification. This document is intended as the successor and replacement for ARINC Specification 812. This document contains significant improvements to CAN data interfaces.