Purpose of this Characteristic

This document, Part 1, sets forth the desired characteristics of the Aviation Satellite Communications (satcom) System avionics intended for installation in all types of commercial transport and business aircraft. The intent of this document is to provide general and specific guidance on the form factor and pin assignments for the installation of the avionics primarily for airline use. Part 2 describes the desired operational capability of the equipment as configured with the Satellite Data Unit (SDU) to provide data and voice communications, as well as additional standards necessary to ensure interchangeability.