The cable core consists of an individual reliable or stranded central toughness factor that is certainly surrounded by optical fibres; they're possibly organized loosely inside a rigid core tube or packed tightly into a cushioned, versatile outer jacket. I've needed to use existing cable in apartment installs which were wired https://scrapbox.io/dienphucthinh22-18558335/cap_tin_hieu_am_thanh_chinh_hang