SIFS              120 drivers/net/wireless/ralink/rt2x00/rt2x00.h #define SIFS			10
SIFS              127 drivers/staging/rtl8192e/rtl8192e/r8192E_hw.h 	SIFS		= 0x03E,
SIFS               77 drivers/staging/rtl8192u/r8192U_hw.h 	SIFS			= 0x03E, // SIFS register