In fly-by-wire avionics, an unexpected frame delay can degrade flight control stability. We demonstrate how network calculus mathematically guarantees that AFDX end-systems never exceed worst-case latency envelopes.
By modeling each virtual link as an arrival curve constrained by its Bandwidth Allocation Gap (BAG) and switch forwarding engines as rate-latency service curves, the upper bound on buffer accumulation is determined analytically.
Testing on an Airbus A380/A350-scale 32-switch network testbed flooded with 98% babbling idiot fault traffic confirmed that certified flight control VLs experienced zero dropped frames and less than 1.1 microseconds of jitter.