Service loops are excess cable (slack) that is designed to be in addition to any cable needed for the actual planned drop (run) length and terminations. Service slack is found at both ends of the permanent link in a structured cabling system. A fiber optic cable consists of a bundle of. Fiber-optic communication is a form of optical communication for transmitting information from one place to another by sending pulses of infrared or visible light through an optical fiber. It includes first determining the type of communication system (s) which will be carried over the network, the geographic layout (premises, campus, outside. I have noticed when they have a fiber optic cable go into a board, think its called SDI OE, the fiber goes to a connecter on the back then it will go through a 4" loops of a couple of turns. Why do they do this? The light doesn't care how long the cable is like in RF. These breakout lengths can be staggered to plug into specific ports, patch panels, and/or hardware. CABLExpress has pre-engineered.
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