Download Data, voice, and video cabling by Jim Hayes PDF

By Jim Hayes

Cabling is among the quickest altering applied sciences, and information, Voice and Video Cabling, third version, has been up-to-date to deal with the entire most up-to-date advancements in premises cabling, together with applied sciences and functions in copper, fiber, and instant cabling. this article is geared up to assist within the realizing of cabling, by way of following a logical layout that covers heritage details on communications structures and media first, after which delves into extra distinct discussions on each one media kind: copper, instant, and fiber. keeping apart the major suggestions into particular sections additionally is helping to lessen confusion among the original install practices one of the varied applied sciences. inside of every one part, themes growth from the fundamentals to elements, set up, and checking out to aid within the improvement of person abilities. This publication additionally presents readers with very important history and assets concerning the most up-to-date cabling criteria, that are an essential component of this fast moving undefined.

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Example text

5. Consider upgrade requirements. If the user plans major upgrades in the network someday, consideration of these plans at the outset may save tremendous expense in the future. By installing a higher-rated component, such as Cat 5 cable instead of Cat 3, it may be possible to use the same cabling for future network expansion or speed increases. Fiber-optic cables with both multimode and singlemode fibers can be installed at small additional expense and can save installing more cables in the future if new applications call for higher bandwidth.

The top option (plug-to-plug) is often used with patchcords to attach equipment in a small office or home environment, where the distances are small and PCs can be connected directly to a hub. Obviously, the fewer terminations the better. Each termination will cause some degradation of the system. For that reason, the jack-to-jack or jack-to-patch panel option is a good choice. “Zone cabling,” the final option shown, is popular with modular offices. A zone box is connected to the telecommunications closet (TC), perhaps with a 25-pair Cat 5E cable, and local drops to the work area are done with patchcords.

Alternatively, a bridging clip can be used if wires are connected straight across the rows. Like connectors, the cable pairs on punchdown blocks must not be allowed to untwist more than 1/2 inch or rated performance will be lost. Horizontal and riser distribution cables and patch cables are wired straight through end to end so that pin 1 at one end is connected to pin 1 at the other. Crossover patch cables are an exception to this rule. They are wired to cross pairs to allow two Ethernet stations to connect directly without a hub, so the transmitter and receivers must cross in the cable to allow direct connection, as shown in Table 4–4.

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