LM_MEDIUM_SPEED_MASK
#define GET_MEDIUM_SPEED(m) ((m) & LM_MEDIUM_SPEED_MASK)
(m) = ((m) & ~LM_MEDIUM_SPEED_MASK) | (s)
#define GET_MEDIUM_SPEED(m) ((m) & LM_MEDIUM_SPEED_MASK)
(m) = ((m) & ~LM_MEDIUM_SPEED_MASK) | (s)