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No law of physics prevents you from installing a switch in the middle of your office and running cables on the floor to all the computers in your network This setup will work, but it falls apart spectacularly when applied to the real-world environment Three problems present themselves to the real-world network tech First, the exposed cables running along the floor are just waiting for someone to trip over them, causing damage to the network and giving that person a wonderful lawsuit opportunity Possible accidents aside, simply moving and stepping on the cabling will, over time, cause a cable to fail due to wires breaking or RJ-45 connectors ripping off cable ends Second, the presence of other electrical devices close to the cable can create interference that confuses the signals going through the wire Third, this type of setup limits your ability to make any changes to the network Before you can change anything, you have to figure out which cables in the huge rat s nest of cables connected to the hub go to which machines Imagine that troubleshooting nightmare! Gosh, you re thinking (okay, I m thinking it, but you should be), there must be a better way to install a physical network A better installation would provide safety, protecting the star from vacuum cleaners, clumsy co-workers, and electrical interference It would have extra hardware to organize and protect the cabling Finally, the new and improved star network installation would feature a cabling standard with the flexibility to enable the network to grow according to its needs, and then to upgrade when the next great network technology comes along As you have no doubt guessed, I m not just theorizing here In the real world, the people who most wanted improved installation standards were the ones who installed cable for a living In response to this demand for standards, the TIA/EIA developed standards for cable installation The TIA/EIA 568 standards you saw in earlier chapters are only part of a larger set of TIA/EIA standards, all lumped together under the umbrella of structured cabling NOTE Installing structured cabling properly takes a startlingly high degree of skill Thousands of pitfalls await inexperienced network people who think they can install their own network cabling Pulling cable requires expensive equipment, a lot of hands, and the ability to react to problems quickly Network techs can lose millions of dollars not to mention their good jobs by imagining they can do it themselves without the proper knowledge If you are interested in learning more details about structured cabling, an organization called BICSI (Building Industry Consulting Services, International) (wwwbicsiorg) provides a series of widely recognized certifications for the cabling industry.

For example: z 3 <5 describes a disk of radius ve centered at the point z = 3 This is shown in Fig 27 EXAMPLE 211 Compute lim(iz 1) / 2 in the open disk z < 3 z 3 SOLUTION Notice that the point z = 3 is on the boundary of the domain of the function Just plugging in we nd lim

Cisco ConfigMaker assists you in configuring a small- to medium-sized network of Cisco routers, switches, hubs, and other devices from a single PC, and at the same time creating an interactive network drawing The user-friendly interface helps you set up your network without necessarily having in-depth knowledge of Cisco IOS Figure 5-2 shows Cisco ConfigMaker's main interface

Successful implementation of a basic structured cabling network requires three essential ingredients: a telecommunications room, horizontal cabling, and a work area Let s zero in on one floor of Figure 5-12 from the previous chapter All the cabling runs from individual PCs to a central location, the telecommunications room (Figure 6-4) What equipment goes in there a switch or a telephone system is not the important thing What matters is that all the cables concentrate in this one area

z 3

All cables run horizontally (for the most part) from the telecommunications room to the PCs This cabling is called, appropriately, horizontal cabling A single piece of installed horizontal cabling is called a run At the opposite end of the horizontal cabling from the telecommunications room is the work area The work area is often simply an office or cubicle that potentially contains a PC and a telephone Figure 6-5 shows both the horizontal cabling and work areas Each of the three parts of a basic star network the telecommunications room, the horizontal cabling, and the work area(s) must follow a series of strict standards

Figure 5-2: Cisco ConfigMaker main interface Before using ConfigMaker, you will need to understand your current network infrastructure and topology, and be able to verify that ConfigMaker supports all of your devices and connections Check out the section on ConfigMaker's supported devices and protocols to determine whether or not your devices and connections are supported

designed to ensure that the cabling system is reliable and easy to manage The cabling standards set by TIA/EIA enable techs to make sensible decisions on equipment installed in the telecommunications room, so let s tackle horizontal cabling first, and then return to the telecommunications room We ll finish up with the work area