The determinacy of Full Duplex Switch Ethernet (AFDX) provides a guaranteed service to support real-time data transmission among avionics subsystem [1]. Traditional AFDX adopts FIFO scheduling algorithm in ES and output port in switches. In this paper, we explore the feasibility to use various scheduling policy in AFDX protocol. The aim of this research is to identify whether alternative scheduling policy can provide good enough QoS service which meets the requirements of avionic environment. We calculate the End-to-End delays of virtual links (VL) in three given circumstance using Network Calculus: PGPS and SP scheme on scheduler of ES and FIFO and SP on output port of AFDX switch. Numerical result shows that the scheme of SP on scheduler of ES and output port of AFDX switch rather than FIFO can provide an improved service.
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