Ukongeza, imingxunya kunye nomonakalo wendawo we-sheath yeplastiki inokubangela ukufuma ekungeneni kwi-core cable, iimpawu zombane zentambo ziyancipha. Kwakhona kwafumanisa ukuba umonakalo webhatyi yentambo ayikho indawo apho iimpawu zokuhambisa ziwohloka, okunika ukugcinwa kwentambo kunye nokuxazulula iingxaki ezininzi, ngoko ke kwinkqubo yokuvelisa intambo, ngokuqhelekileyo iindlela ezintathu zokuqinisekisa ukufuma kunye nokungena kwamanzi. intambo evuthelweyo okanye ezaliswe yipetroleum jelly isebenzisa izinto ezifunxa kakhulu, ezithi ngepetroleum jelly ekhaya enentwana encinci eqhelekileyo. Iintambo ezizaliswe yi-petroleum jelly, i-fiber optic cable yonke i-gap, phakathi kwe-seal engenamanzi idlala indima ye-fiber optical ukusuka kwindawo yangaphandle, ukwandisa ubomi bayo, kwaye akukho kugcinwa kunokugcina ukuzinza kwexesha elide kunye nokuthembeka kwe-fiber optic transmission.