By Jim Hayes
Cabling is among the quickest altering applied sciences, and knowledge, Voice and Video Cabling, third version, has been up to date to handle all of the most recent advancements in premises cabling, together with applied sciences and functions in copper, fiber, and instant cabling. this article is prepared to assist within the knowing of cabling, by way of following a logical layout that covers historical past info on communications structures and media first, after which delves into extra certain discussions on every one media style: copper, instant, and fiber. setting apart the foremost innovations into particular sections additionally is helping to lessen confusion among the original install practices one of the assorted applied sciences. inside each one part, themes development from the fundamentals to elements, set up, and trying out to help within the improvement of person abilities. This e-book additionally offers readers with vital historical past and assets in regards to the most up-to-date cabling criteria, that are an essential component of this fast moving undefined.
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Extra info for Data, Voice and Video Cabling, 3rd Edition
However, most applications still use 4-pair cables due to the possibility of interference of the digital signals running on mixed pairs of cables. 42 CHAPTER 4 — STRUCTURED CABLING Figure 4–2. Structure of unshielded twisted pair cables: from the left, Cat 6, Cat 5E (enhanced), Cat 3, and telephone wire. The origins of “category” designations for UTP cable. Toward the late 1980s, computer networking was growing like mad. Most networks used a proprietary coaxial cable to get adequate bandwidth for the data signals.
Horizontal cabling is the connection to the desktop from the telecom closet or room. ” A third cabling type, “Cabling subsystem 2” connects between active equipment attached to the backbone and a multi-outlet “zone box,” which then connects to the end user with Level III cabling. Figure 4–1. Cabling architecture as per TIA-568 standards. 40 CHAPTER 4 — STRUCTURED CABLING The addition of a third cabling type recognizes the more flexible usage of structured cabling and the evolving terminology of new applications.
The main concern with these devices is that they be protected from damage. The various connections to these devices can be disrupted with very little physical force. Make sure that they will be safe during the installation and in normal use. Not only should you be concerned about the units being hit, but you should also try to locate them somewhere where they will not be tinkered with by employees or maintenance people. Peripheral devices. This term refers to modems, printers, separate drives, and so on.