create barcode excel 2013 6: Installing a Physical Network in Software

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6: Installing a Physical Network
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Figure 6-8 A short equipment rack
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Patch Panels and Cables Ideally, once you install horizontal cabling, it should never be moved As you know, UTP horizontal cabling has a solid core, making it pretty stiff Solid core cables can handle some rearranging, but if you insert a wad of solid core cables directly into your switches, every time you move a cable to a different port on the switch, or move the switch itself, you will jostle the cable You don t have to move a solid core cable many times before one of the solid copper wires breaks, and there goes a network connection! Lucky for you, you can easily avoid this problem by using a patch panel A patch panel is simply a box with a row of female connectors (ports) in the front and permanent connections in the back, to which you connect the horizontal cables (Figure 6-11)
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Figure 6-11 Typical patch panels
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The most common type of patch panel today uses a special type of connecter called a 110-punchdown block, or simply a 110 block UTP cables connect to a 110-punchdown block using you guessed it a punchdown tool Figure 6-12 shows a typical punchdown tool while Figure 6-13 shows the punchdown tool punching down individual strands
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Figure 6-12 Punchdown tool
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6: Installing a Physical Network
Figure 6-13 Punching down a 110 block
EXAM TIP The CompTIA Network+ exam uses the terms 110 block and 66 block exclusively to describe the punchdown blocks common in telecommunication In the field, in contrast, and in manuals and other literature, you ll see the punchdown blocks referred to as 110-punchdown blocks and 66-punchdown blocks as well Some manufacturers even split punchdown into two words, ie, punch down Be prepared to be nimble in the field, but expect 110 block and 66 block on the exam The punchdown block has small metal-lined grooves for the individual wires The punchdown tool has a blunt end that forces the wire into the groove The metal in the groove slices the cladding enough to make contact At one time the older 66-punchdown block patch panel, found in just about every commercial telephone installation (Figure 6-14), saw some use in the PC network world Because of its ease and convenience, however, the 110 block is slowly displacing the 66 block for both telephone service and PC LANs Given their large installed base, it s still very common to find a group of 66-block patch panels in a telecommunications room separate from the PC network s 110-block patch panels Not only do patch panels prevent the horizontal cabling from being moved, they are also your first line of defense in organizing the cables All patch panels have space in the front for labels, and these labels are the network tech s best friend! Simply place a tiny label on the patch panel to identify each cable, and you will never have to experience that sinking feeling of standing in the telecommunications room of your nonfunctioning network, wondering which cable is which If you want to be a purist, there is an official, and rather confusing, TIA/EIA labeling methodology called TIA/EIA 606, but a number of real-world network techs simply use their own internal codes (Figure 6-15)
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Figure 6-14 66-block patch panels
Figure 6-15 Typical patch panels
6: Installing a Physical Network
Patch panels are available in a wide variety of configurations that include different types of ports and numbers of ports You can get UTP, STP, or fiber ports, and some manufacturers combine several different types on the same patch panel Panels are available with 8, 12, 24, 48, or even more ports UTP patch panels, like UTP cables, come with CAT ratings, which you should be sure to check Don t blow a good CAT 6 cable installation by buying a cheap patch panel get a CAT 6 patch panel! Most manufacturers proudly display the CAT level right on the patch panel (Figure 6-16)
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