The Cabling Handbook, Second Edition is a thorough, up-to-the-minute professional's guide to every aspect of LAN and telecommunications cabling, from planning through installation and management. From Category 5 twisted pair to the latest fiber-to-the-desktop solutions, it's all here: standards, product comparisons, topology and architecture design, electrical and safety considerations, and more. This new second edition has been updated with extensive new coverage of fiber technologies, home networking, cable modems, and many other key topics. It offers expert guidance for every step of the cabling system lifecycle, from planning and specification, to choosing installers, testing, certification, and maintenance. Cabling expert John Vacca goes beyond LANs, reviewing key cable-related issues associated with campus networks, WANs, the Internet and xDSL, as well as today's increasingly viable wireless alternatives. You'll also find extensive coverage of tools and techniques for documenting and managing cabling systems. The book contains detailed, up-to-date listings of top cable installers, fiber optic cable manufacturers, cable labeling vendors, wireless systems providers, and more. Whether you buy, sell, or manage cabling systems, The Cabling Handbook, Second Edition will help you maximize quality and minimize disruption -- now, and for decades to come.
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This is the first edition of The Cabling Handbook, published in 1998. The second edition published in December 2000 as is ISBN 0130883174.From the Inside Flap:
The cabling industry is becoming a full-service provider as it evolves its infrastructure into an all-digital superhighway. Both the telephone and computer industries are suggesting that their networking models—traditional point-to-point and extended distributed local area network (LAN) and wide area network (WAN) technology—become part of the cable industry solution. Cable is creating the multimedia networking model solution for the next millennium as a full-service provider through its migration to higher speed bandwidths.Migrating to High-Bandwidth Cabling Solutions
Network cabling may not always be the first thing mentioned in the marketing literature for high-speed LAN technologies, but it certainly is the first thing considered by experts contemplating a migration to high-speed bandwidth solutions. That's why, according to recent cable industry research studies and cabling professionals, many large companies are turning to wiring such as category 5e copper cable and multimode fiber. Furthermore, such cabling is becoming more prevalent for desktop connections.
The push to upgrade both backbone and desktop wiring is indicative of the fear IT managers have that older cabling will not be able to handle next-generation technologies such as ATM and fast Ethernet. This migration is calling into question the value of 25 Mbps ATM and fast-Ethernet technology designed to run over the old category 3 cable.
Category 5e is now the most dominant form of cabling for large installations, and multimode fiber is the most popular medium for vertical connections between floors and buildings in those organizations. Experts in the cabling industry say that massive category 5e upgrades are indeed under way to prepare for future technologies. Most cabling experts agree that when faced with a choice between category 3 and category 5e copper, most people find category 5e worth the extra cost, mostly because the cost of the cable itself is trivial in comparison with installation costs, so one might as well go to category 5e. Cable industry experts have also found that many of the companies that are planning cable changes are also putting fiber in at the desktop level. A lot of people are installing category 5e and fiber to prepare for the future.
The primary application driving the desire for greater bandwidth, cable industry analysts found, was desktop video conferencing. Sixty-five percent of the large organizations surveyed said they planned to implement desktop video conferencing. In the long run, video conferencing is much cheaper than travel. Nevertheless, although big companies are bulking up on category 5e, technology vendors continue to tout the potential to run high-speed bandwidth applications over category 5e's older sibling, category 3. Naturally, that's because of the huge installed base of category 3.
Members of the ATM25 Alliance claim that 25 Mbps ATM can run over category 3 cabling, but implementations of such technology are hard to find. Concerns such as these are driving IT managers to update their cable plants. But as long as copper remains the predominant cable source, testing problems will continue to occur. Because of the difficulty in testing category 5e (caused mostly by the connections between cable segments), networks will still experience cable-related problems—although technology is minimizing cable-related problems. In other words, testing category 5e is a real problem and there is virtually no way to certify a cable installation.
Furthermore, despite the number of industry standard tests (TIA Cat 5, 5E, 6, 7; ISO/IEC Class C, D, E, F; etc.), other groups and organizations have needs for test limits that differ from the standards. This includes vendors that tailor test limits to a particular connection system or organizations that require performance that exceeds standards.
Eventually we're all going to go to fiber optic, optical systems, or wireless anyway. So, can widening the fiber highway or optical systems through wave division multiplexing deliver the bandwidth promise?Widening the Optical Systems Highway
Recent advances in wave division multiplexing (WDM) technology have offered the potential for the deployment of cost-effective, highly reliable, high-capacity fiber optic network solutions. This is particularly important since the sustained growth of increasingly bandwidth-hungry applications requires an unprecedented rate of fiber optic network expansion, and places increasing demands on network design and planning. Development of time division multiplexing (TDM) transport systems has reached a plateau and operators can no longer wait for technology, such as managed Synchronous Transfer Mode-64 (STM-64) transmission, to mature. As a result, operators are increasingly pursuing WDM solutions to address evolving capacity issues. Cost-benefit analysis, however, reveals that the deployment of currently available small-scale (four wavelength) stand-alone systems only makes sense in long-distance carrier networks—of the kind found in North America, for example. For European intraoperator networks, efficiencies only begin to be realized with 16 wavelength systems.
As a longer-term strategy, the creation of a high-capacity managed WDM network layer using optical add-drop multiplexers or wavelength routers is gaining acceptance in the formulation of future network architectures. The biggest challenge in implementing an all-optical fiber network will be in the delivery of an optical layer network management platform and the successful integration with existing synchronous digital hierarchy (SDH) network management systems. Most modern fiber optic networks today use time division multiplexing techniques to send data down the Physical layer. But, experts say, most TDM equipment utilizes only about 2 percent of the intrinsic capacity of fiber. Dense wavelength division multiplexing is a technology that allows multiple data streams to be simultaneously transmitted over a single fiber at data rates as high as the fiber plant will allow—typically 3.5 Gbps. The WDM approach multiplies the simple 3.5 Gbps system by up to 16 times. So a 16-channel system (with ITU-recommended channel-spacing) will support 50 Gbps in each direction over a fiber pair. Also under development are 50-channel systems that will support 200 Gbps—the equivalent of over 20 STM-64 transmitters.
Current WDM technology utilizes a composite optical signal carrying 4, 8, or 16 data streams, each transmitted on a distinct optical wavelength. Although WDM has been a known technology for years, its early application was restricted to providing two widely separated wavelengths. Only recently has the technology evolved to the point where parallel wavelengths can be densely packed and integrated into a transmission system with multiple, simultaneous, extremely high frequency signals in the 192 to 200 Terahertz (Thz) range. The 16-channel system in essence provides a virtual 16-fiber cable, with each frequency channel serving as a unique STM-16 carrier. The most common form of WDM uses a fiber pair—one for transmission and one for reception. The availability of precise demultiplexers and erbium-doped fiber amplifiers has allowed WDM with 8 and 16 channel counts to be commercially delivered. Incoming optic streams are split into individual wavelengths using a newly developed technique of embedding a component (known as a fiber Bragg grating) so that the refractive index of the core is permanently modified to allow only a specific wavelength to pass through. A series of such gratings are used to split the carrier into a required composite wave. The fiber gating creates a highly selective, narrow bandwidth filter that functions somewhat like a mirror and provides significantly greater wavelength selectivity than any other optical technology.
So, would wireless technology be any better?Wireless WANs and LANs
As school districts struggle with how to interconnect local area networks that they have in operation at various campuses to form a wide area network, one viable solution that is not well known is the use of wireless technology. Wireless network bridges to transmit data within or between buildings, using spread spectrum radio waves or infrared technologies or microwaves, can be used to connect LANs that are separated by as much as 50 miles. Many of the less powerful bridges, however, may be limited to a range of five to eight miles. These wireless links can provide data transfer rates from less than 1 Mbps to more than 10 Mbps. As one might expect, the greater the link distance capability, and the higher the data transfer rate, the more expensive the equipment. For example, a pair of bridges operating at a radio frequency of 900 MHz may cost over $9,000, provide a link distance of two to three miles, and transfer data at 1 Mbps. A 2.4 Ghz bridge might cost over $8,000, provide a reliable link over a distance of six to nine miles, and transfer data at 2 Mbps. On the other hand, a microwave link at 31 Ghz may provide a connection over 10 to 13 miles at 10 Mbps (full duplex) for an equipment cost of less than $60,000.
One really attractive feature of wireless connections, and their major advantage, is that there is a one-time cost for the equipment and installation. There are no recurring, ongoing monthly costs! Thus, when compared to connection options that have continuing monthly fees associated, the wireless solution quickly pays for itself.
The potential drawbacks to a wireless solution include environmental factors. Terrain may eliminate wireless as an option; intervening hills and tall buildings or trees can block the radio frequency (RF) signals. Terrestrial wireless RF technology (non-satellite-based) is referred to as line-of-sight. This means that the antennas on the wireless bridge units must be able to see each other. There must be no obstacles in the way to block or reflect the transmitted signals. Severe weather, such as torrential rains, can adversely affect signal transmission and temporarily down the link. Similarly, the link might be susceptible to other radio frequency interference. Dense fog could possibly be a problem for microwave links.
On the other hand, wireless broadband networks can solve the terrain problem via fixed satellite orbital patterns. Wireless broadband networks are defined as communication without wires over distance by the use of arbitrary codes. Modern examples include hand-held devices like pagers, smart phones, personal digital assistants (PDAs) and personal communication services (PCS) using wireless modems or satellites to enable wireless data communications.
The bottom line: Wireless connectivity must be seriously considered if the terrain allows its use or satellites are capable of receiving (uplink) and sending (downlink) high-speed data. Some reports indicate that microwave links can be more reliable than leased data lines. Furthermore, there are some major potential benefits to wireless solutions. For example, school district administrators could enter a conference room, turn on their laptop computers, and achieve high-speed connectivity to the district network. Teachers could sit down in the cafeteria with their notebooks and instantly update class schedules, grades, and attendance records in a centralized database. Students can take hand-held devices outside of the classroom, collect scientific data, and share their findings in real time with peers via the Internet.
Finally, as the price of technology drops and demand for next-generation applications rises, home cable networking is moving into a new phase of convenience and functionality. The reasons have everything to do with the phenomenal success of the Internet and the advent of the integrated digital home.
It's an exciting time for home networks. Multicomputer households are definitely on the rise as the power of the Web grows daily and new Internet-based applications and appliances are introduced. High-speed Internet access via DSL, cable, or satellite service is imminent if not already available in your area, unlocking the full capabilities of the Internet for home-based communications, education, commerce, entertainment, and more.
The integrated digital home will merge with what we now think of as separate application dimensions (security, music and video entertainment, telephone and fax, and computing devices) into one seamless environment. The key to that future is the development of the home gateway (a network device that translates between different types of networks or computer systems) with its ability to bridge these different systems so that they can communicate with one another.
Sound like a vision for the middle part of this century? Actually, all of these scenarios are taking place today thanks to recent advances in mobile computing and wireless technology. Already, wireless local area networks (WLANs) have extended, or replaced, traditional LANs in hundreds of educational sites, and many more IT managers are carefully examining the benefits of wireless solutions. Actually, the bottom line to all of this is that although the initial investment for WLAN hardware might be higher, long-term cost savings can be realized because technicians never need to pull wire through walls or ceilings to expand the network.Who This Book Is For
This book can be used by domestic and international system administrators, government computer security officials, network administrators, senior managers, engineers, sales engineers, marketing staff, Web developers, military senior top brass, network designers and technicians, cabling project managers, cable installers, LAN and PBX administrators, and other satellite communications personnel. In short, the book is targeted for all types of people and organizations around the globe who have responsibility for cabling decisions and/or project implementation, network cabling installation, cost justification and investments, and standards. Others who may find it useful are scientists, engineers, educators, top-level executives, information technology and department managers, technical staff, and the more than 800 million Internet, intranet, and extranet users around the world. Some previous experience with cabling installation is required. What's So Special About This Book?
The Cabling Handbook, Second Edition, is unique in its comprehensive coverage of network cabling installation, cost justification and investments, and the latest standards. The book is a thorough, up-to-the-minute professional's guide to every aspect of LAN and telecommunications cabling, from planning through installation and management. From category 5e twisted pair and fiber to the latest wireless LAN solutions, it's all here: standards, product comparisons, topology and architecture design, electrical and safety considerations, and more—including invaluable information for anyone preparing for CompTIA Network+ certification. This brand-new second edition has been updated with extensive new coverage of fiber technologies, home networking, cable modems, and much more. Key features include:
Intermediate- to advanced-level instruction to help you install the latest copper, fiber, and wireless network cabling systems.
Practical tips on cost-justifying your cabling investments.
Tips on h...
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Descripción Pearson Education, 2000. Paperback. Estado de conservación: New. Never used!. Nº de ref. de la librería P110130883174