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Arinc 825 is a specification for implementing Controller Area Network (CAN) bus in avionic systems, with particular emphasis on electronic and computer-based components used in commercial aircrafts. It outlines the physical layer parameters, network architecture, message formats, data communication protocols and high-level system requirements to ensure seamless integration of various subsystems and devices. Arinc 825 supports both low-speed (10 Kbps) and high-speed (1 Mbps) CAN bus configurations, enabling real-time data transfer for critical applications like aircraft control systems, engine monitoring and diagnostic systems, avionic displays, and passenger entertainment systems. The specification also defines the use of specific message identifiers, message priority schemes, and error detection mechanisms to ensure reliable and safe communication within the network. In essence, Arinc 825 serves as a blueprint for designing, implementing, and integrating CAN-based avionic systems in commercial aircrafts, with the goal of enhancing safety, reliability, and performance while reducing complexity and cost.