Welcome to the ARINC 853 Knowledge Base for the "Cabin Secure Media-Independent Messaging" Protocol. This repository contains standardized interface descriptions for aircraft cabin equipment. Here, the aerospace industry collaborates to shape the cabin network of the future.

This repository complements the ARINC 853 "CSMIM" standard. ARINC 853 specifies a modern communication protocol for non-essential cabin equipment. The protocol specification draws from related standards in the building and home automation domain, including MQTT and CBOR as building blocks. Whereas the ARINC 853 document describes the generic protocol and data structure, this repository – the CSMIM Knowledge Base – contains concrete interface definitions for various cabin equipment. These definitions are considered "standard" and should be used by all cabin equipment suppliers as far as possible.

The goal of our activities is to enable interoperability of all cabin equipment on all types of aircraft, and to create an open aircraft cabin network where any supplier can add new, useful functions.

You should have a basic understanding of the ARINC 853 standard itself, in particular of its chapter 6.2 which describes the CSMIM abstract data model. This repository primarily contains a list of standardized CSMIM object types, which are specified in ARINC 853 §6.2.7. The object types are located in the types/ folder as files in YAML format.

• If you search for object types: Use the "Go to file" search box and input the object type identifier or simply phrases of interest. For example, input "light" to find object types concerned with cabin lighting. The search results will include the types (types/csmim.obj.*.yaml) plus all potential locations for objects instantiated from these types (path/.../csmim.obj.*.yaml).

• If you could not find an object type matching your requirements: Try searching the issues for your requirements. Maybe someone is already working on your topic, and you can join an existing discussion. If the topic is new: Create an issue, describe your requirements and label it a "question".

• If you want to propose a new object type or enhance an existing one: Create an issue, describe your requirements and label it an "enhancement". If there are existing object types similar to what you need, mention them and explain what is missing for you and how the type should be enhanced.

• If you want to publish manufacturer-specific extensions: To publish your manufacturer-specific object types, fork this repository and add your manufacturer-specific definitions there. Make sure not to change any existing type. Always create new files. Add your manufacturer code to the object type identifier as required by the CSMIM standard. Derive from standard types wherever possible.

• If you require a manufacturer code for your company: In case you do not have a manufacturer code for ARINC 853, see the instructions in the manufacturer folder.

This repository is owned by SAE ITC, the organization behind ARINC. The repository is managed by the members of CSMIM working group, which belongs to the ARINC Cabin Systems Subcommittee. Every ARINC member company can become active in the Cabin Systems Subcommittee and join the CSMIM working group.

We maintain a group email, where you can reach out to the complete working group. Feel free to approach us.