The cable core includes only one reliable or stranded central power factor which is surrounded by optical fibres; they are possibly arranged loosely in a rigid core tube or packed tightly into a cushioned, adaptable outer jacket. I'll conceed that it ought to be even further absent, nonetheless for practicalitys https://dien-phuc-thinh.gitbook.io/dien-phuc-thinh/thiet-bi-chong-set-lan-truyen-val-phoenix-contact-tai-dien-phuc-thinh