By Jim Hayes
Cabling is likely one of the quickest altering applied sciences, and knowledge, Voice and Video Cabling, third version, has been up-to-date to handle the entire newest advancements in premises cabling, together with applied sciences and purposes in copper, fiber, and instant cabling. this article is geared up to assist within the knowing of cabling, via following a logical structure that covers heritage info on communications platforms and media first, after which delves into extra exact discussions on every one media sort: copper, instant, and fiber. isolating the major options into particular sections additionally is helping to lessen confusion among the original set up practices one of the diverse applied sciences. inside of each one part, issues growth from the fundamentals to elements, deploy, and checking out to aid within the improvement of person talents. This publication additionally presents readers with vital heritage and assets in regards to the most up-to-date cabling criteria, that are an essential component of this fast paced undefined.
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Additional info for Data, voice, and video cabling
The manufacturers who write these standards and build products that comply with them assume the task of educating their customers. Every structured cabling manufacturer has a section in the back of their catalog or on their website that explains the relevant standards in simple words and clear pictures that you can actually understand. They tell you what systems should look like, what components are used to build them, and how they should be tested. Take advantage of these companies— they want you to—that’s why they attend those boring standards meetings and write all those catalog pages, hoping you will come to them for education and purchase their products.
The view in Figure 4–4 is looking into a jack. The T568A and T568B differ only in one pair being swapped, which may not affect performance, so they are basically similar if used throughout a link. But the two cannot be mixed in a link or you will get a crossing of two pairs that will not make proper connections. Mixing either of these with USOC patterns also results in miswired connections. Some networks use only two pairs, but high-speed networks are beginning to use all four pairs for transmission, as shown in Table 4–3.
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.