ARINC 448706-4 Application Field and Working Principle

ARINC 448706-4 is a standard communication bus for on board components in major civil aircrafts. This communication bus is mainly used for the purpose of integrating automated systems and components, helping to reduce complexity of wiring runs and allowing for faster and easier troubleshooting. ARINC 448706-4 is also known as ARINC-664-P7. It is a variation of the ARINC-664-P2 communications bus which was developed to provide reliable communication between multiple systems in a large aircraft.

Application Field

ARINC-664-P7 (ARINC 448706-4) is a point-to-point communication bus that provides real-time bidirectional communication between multiple on-board systems and devices. It is highly scalable and can be used for complex applications requiring data transfer rates over multiple channels. ARINC 448706-4 is used on most large civil aircraft, including the Boeing 787 Dreamliner, Airbus A380, Airbus A340 and Embraer E-Jet. ARINC 448706-4 is used to provide a high-speed, reliable real-time communication path between different equipment components, allowing flight crew to control the behavior of systems from the cockpit.

ARINC 448706-4 Working Principle

ARINC 448706-4 uses a “token bus” topology to allow multiple systems and devices to communicate with each other. Despite being a complex system, the core working principle of ARINC 448706-4 is relatively simple. It is based on asynchronous communication between nodes connected on the bus, with a controller managing the interaction and arbitrating access to the bus. The controller is responsible for setting the speed and direction of data transfer and for the distribution of data throughout the system.

A controller is traditionally used to control the access to the bus and to allow the nodes to transmit their data. The nodes transmit data packets encoded using Manchester code, in which each data bit is represented as a transition from a 0 to a 1, or from a 1 to a 0. This allows the receiving device to recognize the start bit of a packet, as each packet starts with a transition from 0 to 1, and then follows up with the data bits. The packets are then transmitted in order of importance from high to low and are generally devoid of errors.

Conclusion

ARINC 448706-4 is a reliable and easy to use communication bus that allows multiple systems and devices to communicate with each other. It is an ideal solution for aircrafts due to its scalability and high speed transfer rates. It has a simple working principle which is based on token bus topology and Manchester code encoding, allowing for easy implementation and debugging.