Lesi sixhumi senziwe ngezinto zethusi nezepulasitiki futhi singasetshenziselwa ukuxhumana kwepayipi kumasistimu womoya. Lolu hlobo lwesixhumi lunendlela yokuxhuma okukodwa, engaxhuma ngokushesha futhi kalula amapayipi futhi ithuthukise ukusebenza kahle komsebenzi. Ngesikhathi esifanayo, ibuye ibe nesici sokuhambisana kwangaphakathi nangaphandle, okungase kuhambisane nezinye izixhumi zokucaciswa okuhlukile.