![]() Another recent trend is to install hybrid fiber-optic cables in the backbone, terminating and using the multimode fibers but leaving the singlemode fibers dark, or unused, to support future needs.īackbone cabling systems that are being installed can usually be classified into one of four different topologies, each of which has its own characteristics. For this reason, many backbone installations depend on optical fiber, and can include dozens of spare fibers, if not actual cables. Installations today have to anticipate future growth and prospective applications as well as current needs. To meet this requirement, system designers and installers must use foresight when planning a backbone system. The main requirement of a backbone system is that it be able to support many different user applications, from simple voice transmission to very unforgiving high-speed data and multimedia networks. ![]() In some applications, then, there is no real difference between the terms "horizontal" and "vertical." Physical topologies may vary, and sometimes connections don`t fit our assumptions about what a backbone is. In a campus environment, however, the backbone may run horizontally, connecting different entrance facilities or remote telecommunications closets. In multistory buildings, for example, the backbone connects the equipment or computer room in the basement with telecommunications closets located on every floor. Backbone systems are often referred to as riser systems because in many installations the bulk of the system, especially the cable, is installed in a vertical riser. ![]() The backbone system consists of connections between entrance facilities, equipment rooms and telecommunications closets. Design, installation and user considerations are vital to putting in building backbones. ![]()
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