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Download 28.Industry Applications by John G. Webster (Editor) PDF

By John G. Webster (Editor)

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A cable can house multiple links, and a link can contain pairs from multiple cables. In practice one often has a cable that contains enough pairs to serve many outlets from the floor distributor to a transition point or a consolidation point, and individual cables from transition and consolidation points to outlet. In this case links consist of two segments, one from the distributor to the transition or consolidation point, and the second from that point to the outlet. These links have the shape of a star with the central point at the floor distributor, while the cables have a tree-and-branch topology.

Thus its susceptibility to electronic surveillance (tapping) is of high importance. You can only tap an optical fiber by touching it, and there are ways to detect whether a fiber is subject to tapping: the reduction of energy at the receiving end caused by tapping BUILDING WIRING 19 may be detected, as well as the reduction of pressure in a pressurized cable. Copper cables radiate and pick up signals. Thus such cables need not be physically touched to detect or to corrupt the data flow. Cables used for information transfer.

Economics of generic cabling. Dedicated networks and cabling characteristics that are tailored to a specific transmission protocol or application decrease the flexibility of a building’s telecommunications infrastructure and increase cost. The most cost-effective approach is to precable premises in such a way that any application will be compatible with the installed transmission channel. Figure 1 shows a comparison of cost versus time for the two cabling strategies: precabling with a structured and generic cabling system, and demand-driven cabling with application-specific material.

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