RAL_RXTX_TURNAROUND 1700 dev/usb/if_ral.c 		sifs = 16 - RAL_RXTX_TURNAROUND;
RAL_RXTX_TURNAROUND 1703 dev/usb/if_ral.c 		sifs = 10 - RAL_RXTX_TURNAROUND;