Which is the cable used in AFDX?
ARINC Specification 664 calls for quadrax cable or fiber optic cable.  Quadrax is a four conductor matched impedance (100 ohm) cable.  Connectors are MIL-DTL-38999.  


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The primary benefit is improved EMI protection and ruggedized connectors.

The B787 uses fiber optic.  A380 uses the quadrax cable.