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TABLE 11
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Cabling Recommendations for Various Applications Minimum cable performance categories Cat 2 Cat 3* Cat 5e Yes Yes Yes Yes (for runs Yes (for runs Yes (for runs under 100 ft) under 290 ft) under 350 ft) Yes (if 4 Yes (if 4 Yes (if 4 LAN pair cable) pair cable) pair cable) Not Yes Yes recommended No Not Not recommended recommended No Yes/no Yes No No No
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Application Analog phone only LAN/4/10/16 Mbps only Shared analog phone and 4/10/16 Mbps Digital phone only Shared digital phone and LAN/4/10/16 Mbps LAN 100/1000 Mbps only Shared digital phone and LAN 100/1000 Mbps
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*Category 5e is required for 100BaseTX and 1000BaseT May not operate at extended distances, particularly with Token-Ring 16 Mbps networks Higher performance category cables will provide better isolation between the phone and data signals Some 100 Mbps technologies are designed to operate on a minimum of Category 3 cable
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tible to problems from crosstalk, signal balance, interfering signals, magnetic coupling, and noise sources The danger of interference from telephone pairs is probably less for the analog signals of conventional telephones, because they limit transmitted frequencies to 4 kHz or less However, both analog and digital telephones may use extra wire pairs for power This power connection is unbalanced and may serve to increase the undesired coupling effects between pairs in the cable Some cabling designers feel that data and telephone wiring should never be mixed There is some support for this view from the standards, when interpreted strictly None of the standards provide guidelines for the application of two or more signals to the same cable, although some users simply ignore the issue The most widely used standard, TIA/EIA-568-C, simply suggests two cables to each telecommunications outlet and recommends that each be used for only one application If you are going to provide separate cables for phone and data, you can easily run them to totally separate areas of a wiring closet, or even to separate wiring closets You will never cause a technical problem with either LAN or telephone systems by separating data and voice cables On the other hand, you can expect the installation cost to be higher in almost all cases VoIP is a relatively new method of digitizing and transporting voice signals as conventional IP packets Voice connections to desk phones can now be made using
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PART ONE
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the same data cable as the workstation computer However, totally mixing voice and data in this manner is potentially problematic Some voice experts recommend totally separate physical networks, including cabling, for VoIP networks If you have any doubts about the basis for this approach, consider first how often your computer network goes down, and then try to remember the last time the phones failed
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Designing a Structured Cabling System
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The three keys to a successful structured LAN wiring installation are proper design, quality materials, and good workmanship Proper design involves the careful orchestration of several complex factors, applied in a standard fashion, to produce a successful installation plan that will meet your needs for today and for many years to come These factors include the length of run, wire type, wire terminations, and routing Many of the technical details are covered in other areas of this book Here, we will give you an overview of how these factors come into play in creating a successful design In creating your cabling design, you will have to make many decisions Most of these decisions can be reduced to a few simple rules, so that your overall performance requirements actually dictate the proper components to choose In this way, you will ensure that the final wiring system design will provide the connectivity, performance, and growth that you need This section gives a brief explanation of structured cabling concepts with a summary of some of the design considerations involved and culminates in a simple design example In later chapters, we will explain many of the common wire types and wiring systems that are, or have been, used in LAN wiring Although some of the older cabling methods are no longer being used in new installations, it is important that they be here for completeness and for those who must add to or modify older cabling systems For the most part, we will talk about unshielded twisted-pair wiring when citing design factors and installation techniques This has been the area of heated activity in the specification of wire, installation and performance standards, and introduction of new technologies This is clearly where the action is Fiber-optic cabling is also a current technology, but its use in the workplace is limited at present It is more expensive to buy, more difficult and expensive to install, requires more expensive workstation and hub interfaces, and generally exceeds the bandwidth required for the current and next generation of LAN data throughput Fiber-optic cabling does, however, have several unique and very beneficial characteristics that can be of great assistance in larger cabling designs For that reason, a description of fiber-optic cabling is included wherever that medium is particularly useful
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