Role: Civil aircraft point-to-multipoint bus
Speed: 12.5 or 100 kbps
Topology: 1 transmit → up to 20 receivers
Introduced: Early 1980s
- Simple, reliable, low data rate.
- 2-wire, shielded twisted pair.
- No arbitration — transmitter always broadcasts.
- Used in:
- Airbus A-310, Airbus A-320,
- Boeing 757, 767