Labels:text | screenshot | diagram | font OCR: TELECOMMUNICATIONS SYSTEM ELEMENTS To other 1 = Service entrance floors 2 - Entrance room/ space 3 = Backbone system 4 - Telecommunications closet X 5 - Horizontal distribution (pathway) 3 X = Cross connections Telecommunications Property To telephone manhole X 2 company central office FIGURE 1: These five elements comprise the basic anatomy of a telecommunications system and provide the backbone for the work of the building designer.