Sender Receiver |-----W=0,FCN=6,Seq=1----->| |-----W=0,FCN=5,Seq=2----->| |-----W=0,FCN=4,Seq=3----->| |-----W=0,FCN=3,Seq=4----->| |-----W=0,FCN=2,Seq=5----->| |-----W=0,FCN=1,Seq=6----->| DL Enable |-----W=0,FCN=0,Seq=7----->| |<------ RECV ABORT ------| under-resourced (Error)