Aerokid From Belgium, joined Jun 2000, 348 posts, RR: 1 Reply 2, posted (11 years 5 months 4 weeks 6 hours ago) and read 1571 times:
Arinc 429 (Arinc = Aircraft Radio INCorporated, a governing body concerned with the standardization of avionics) is a standard databus for data exchange between the various instruments/avionics/LRU's onboard an aircraft. Arinc 429 has a limited transfer speed of 100 kbit/s and there can only be one transmitter, and a maximum of 20 receivers.
There's also an advanced version, Arinc 629 (used on modern airliners like the 777 or 330/340). Arinc 629 has a maximum speed of up to 2Mbit per second and allows bidirectional data transfer for all connected stations.