ATutorialonCentralizedCentralizedOpticalFiberCablingNetworks PartIIby Douglas E. Harshbarger and George Sellardn the conventional, decentral- of distributed electronics. Howev- dated in the main cross-connect,ized premises data network, er, telecommunications closets take the centralized design is a vehicleFIBERI backbone cables travel from a up valuable real estate and, because for reducing the number ofOPTICS main cross-connect (or, in an inter- of the active electronics, they telecommunications closets. Thebuilding network, an intermediate require power, air-conditioning long cabling runs typical of thesecross-connect) to one or more hor- and grounding. Decentralization designs, often exceeding 100 m, areizontal cross-connects (HC) in increases complexity and presents perfect for fiber, but impractical fortelecommunications closets on multiple potential points of failure. copper.each floor of a building. The HC Moreover, the use of UTP copper A variation on the centralizedtypically includes active electronics cable in the conventional design design is the multiuser outlet net-equipment like hubs, concentrators places bandwidth limitations on work. From the telecommunica-or switches. Individual outlets for the network. And because of its tions closet, a high-fiber-counteach user are located within 100 m inherent electrical properties, UTP cable travels to a multiuser outletof the telecommunications closet is vulnerable to electromagnetic which ...
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