Nsalu zonyezimira ndi nsalu zomwe zimakhala ndi zonyezimira zomwe zimayambira pakuwonetsa mitundu iwiri mpaka mawonekedwe amtundu wa utawaleza. Nthawi zambiri amapangidwa ndi mawaya achitsulo, ma fiber optics, kapena zida zofananira zomwe zimawunikira kumbuyo, zomwe zimapangitsa kuti pakhale kuwala kwapadera.
Nsalu yachitsulo: Yopangidwa ndi kuluka ulusi wachitsulo (monga siliva, mkuwa, golide, ndi zina zotero) kukhala nsalu. Ikayatsidwa ndi kuwala, nsaluyi imawonetsa kuwala kwachitsulo chowala.
Fiber Optic Nsalu: Izi zimapezeka poluka ulusi wowoneka bwino munsalu. Amadziwika ndi kukhala opepuka komanso kutulutsa zotsatira zakuthwa kung'anima, zomwe zimapangitsa kuti zigwiritsidwe ntchito popanga zinthu monga zovala zapamwamba ndi zikwama zam'manja.
Kawirikawiri, nsalu zonyezimira zakhala zokondedwa zatsopano zamakampani opanga mafashoni chifukwa cha mawonekedwe awo apadera owala komanso ntchito zosiyanasiyana (monga mafashoni, kukongoletsa siteji, etc.).