Isahani y'ibisheke ikozwe muri fibre isanzwe y'ibisheke, kandi imiterere ya fibre ituma isahani yangirika bisanzwe mubihe bidukikije bidakwiye kwangiza ibidukikije.
Imiterere ya fibre yisahani yibisheke ituma igira imbaraga nimbaraga, ntabwo byoroshye guhinduka cyangwa kumeneka, kandi irashobora kwihanganira uburemere nubushyuhe bwibiryo bitandukanye.