Optical Fiber Communications 4th Edition by Gerd Keiser

Exercise 9

Atwo-story office building has two 10-feet-wide hallways per floor that connect four rows of offices with eight offices per row as is shown in Fig. 13.56. Each office is a 15 feet × 15 feet square. The office ceiling height is 9 feet with a false ceiling hung 1 foot below the actual ceiling. Also, as shown in Fig. 13.56, there is a wiring room for LAN interconnection and control equipment in one corner of each floor. Every office has a local-area network socket on each of the two walls that are perpendicular to the hallway wall. If we assume that cables can be run only in the walls and in the ceilings, estimate the length of cable (in feet) that is required for the following configurations:
( a ) A coaxial cable bus with a twisted-­pair wire drop from the ceiling to each outlet.
( b ) A fiber optic star that connects each outlet to the wiring room on the corresponding floor and a vertical fiber optic riser that connects the stars in each wiring room.
Fig. 13.56