Instruments in an aircraft typically communicate over an ARINC 429 data bus that uses simplex communication, supports data rates up to 100 kbps, and can transmit 23 bits of data with each message. If two instruments need to send data back and forth, then two ARINC 429 buses must be used. As a result, adding more devices that must communicate with each other quickly increases the number of necessary buses, and because of the low data-transfer rate, the amount of real-time data using this approach has to be kept to a minimum.
With the adoption of the AFDX (avionics full-duplex switched Ethernet) standard network, all devices can communicate on a single bus at much higher data rates (1000 times higher with the use of 100-Mbps Ethernet). This allows for much greater versatility and higher data throughput, so devices can communicate in real time. For the system designer, however, it introduces another set of challenges, since communications become time-division multiplexed and timing must be controlled.
The added complexity also creates a greater possibility for system-level problems, and the architecture of the bus, which includes multiple links and systems, makes it difficult to troubleshoot an issue. There is no simple method for monitoring all the data traffic, since multiple data paths are possible. This has led test companies to develop innovative tools for addressing AFDX test.
Hi,dear Sir Hossein Yassaie, and congratulation for your achievement, I am a test pilot, Swedish Iranian, and I have tested more then 150 aircraft's of different types and sizes in private and secret conditions .... your design is based on adoption of the AFDX and you did not considered the pilot visual sense, the condition of landing and takeoff, the deviation of instruments indications, the ice on the wings and shrinkage of the moveable connections with reaction of data form electronic signal to mechanical reaction delay .
Did you ever considered that in emergency condition the pilot have 5 to 8 seconds to land or less then 1 second to put the nose of aircraft up or level the aircraft to save it from the crash?
As a designer of aviation instruments, have you ever been flying with a damaged instrument aircraft, tracing the defected parts before takeoff?
your work is grate but not perfect.
You must have a test pilot in your board .
Dear Hossein lets save the passengers and make the airlines more safe, and be proud for saving lives, I can help you in this line free of charges, I am proud of you as an Iranian Engineer / X F4 pilot.
My. Tel. at this moment is : + 37258008011
hope to see you soon
Franz Patrick Scharonberg
David Patterson, known for his pioneering research that led to RAID, clusters and more, is part of a team at UC Berkeley that recently made its RISC-V processor architecture an open source hardware offering. We talk with Patterson and one of his colleagues behind the effort about the opportunities they see, what new kinds of designs they hope to enable and what it means for today’s commercial processor giants such as Intel, ARM and Imagination Technologies.