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Generator PDF 417 in Software figure 1-18 Computer Wire Tx 1 Tx 2 Rx 3 Rx 6 hub Wire 1 Rx 2 Rx 3 Tx 6 Tx

figure 1-18 Computer Wire Tx 1 Tx 2 Rx 3 Rx 6 hub Wire 1 Rx 2 Rx 3 Tx 6 Tx
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Pinout diagram for a straightthrough cable
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Basic Network Concepts
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computer, as shown in Figure 1-19 How could a computer pick up the data if it was not sent to the receive pins This will not work, so we will need to change the wiring of the cable to what is known as a crossover cable In order to connect two systems directly together without the use of a hub, you will need to create a crossover cable by switching wires 1 and 2 with wires 3 and 6 at one end of the cable, as shown in Figure 1-20 You will notice that the transmit pins on Computer A are connected to the receive pins on Computer B, thus allowing Computer A to For the Network+ exam, send data to Computer B The same applies for remember that to create a crossover Computer B to send to Computer A pins A cable wires 1 and 2 are switched with and B on Computer B are wired to pins 3 and 6 wires 3 and 6 on one end of the cable on Computer A so that Computer A can receive data from Computer B
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568a and 568b standards Although only four of the wires are used to send and receive data in most environments today, some of the newer standards use all eight wires Therefore, it is important to know the order of all eight wires in a UTP cable There are two popular wiring standards today, 568A and 568B, but because 568B is the more popular standard for CAT 5 and CAT 5e, I will discuss the wire order for 568B Table 1-3 shows the wire order for the 568B standard of a straightthrough cable at both ends
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Computer A Wire Tx 1 Tx 2 Rx 3 Rx 6 Computer B Wire 1 Tx 2 Tx 3 Rx 6 Rx
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figure 1-19
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Using a straightthrough cable to connect two computers will not work
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figure 1-20
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Computer A Wire Tx 1 Tx 2 Rx 3 Rx 6
Computer B Wire 1 Tx 2 Tx 3 Rx 6 Rx
Pinout diagram of a crossover cable
Network Media and Connectors
tabLe 1-3
Wire
1 2 3 4 5 6 7 8
Connector #1
White wire/orange stripe (whiteorange) Orange wire White wire/green stripe (white-green) Blue wire White wire/blue stripe (white-blue) Green wire White wire/brown stripe (whitebrown) Brown wire
Connector #2
White wire/orange stripe (whiteorange) Orange wire White wire/green stripe (white-green) Blue wire White wire/blue stripe (white-blue) Green wire White wire/brown stripe (whitebrown) Brown wire
The 568B Wiring Standard for a Straight-Through Cable
Following this standard and what you have learned of crossover cables, you would switch wires 1 and 2 with wires 3 and 6 at one end to create a crossover cable After switching the wires on one end, you would have a cable that has the order of wires shown in Table 1-4
tabLe 1-4
Wire
1 2 3 4 5 6 7 8
Connector #1
White wire/orange stripe (whiteorange) Orange wire White wire/green stripe (white-green) Blue wire White wire/blue stripe (white-blue) Green wire White wire/brown stripe (whitebrown) Brown wire
Connector #2
White wire/green stripe (white-green) Green wire White wire/orange stripe (whiteorange) Blue wire White wire/blue stripe (white-blue) Orange wire White wire/brown stripe (whitebrown) Brown wire
The 568B Wiring Standard for a Crossover Cable
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Basic Network Concepts
figure 1-21
A crimping tool
Before moving on to other cable types, apply what you have learned by crimping (creating) your own CAT 5 cable To create your own network cable, you will need to have a crimper like the one shown in Figure 1-21 You can get a fairly cheap crimping tool at your local electronics store, but you can also buy some fairly expensive crimping tools When you select a crimping tool, you want to make sure that you have one that has a built-in crimper as well as a wire stripper and a wire cutter Exercise 1-1 demonstrates the steps needed to crimp your own CAT 5 cable
exerCise 1-1 Crimping a Category 5 Cable
In this exercise, you will learn how to crimp your own CAT 5 cable To complete this exercise, you will need to have a crimping tool, a piece of CAT 5 cabling, some RJ-45 connectors, and a little bit of patience! To create a CAT 5 cable, do the following: 1 Ensure that you have a clean-cut end on the cable by using your wire cutters to cut a little off the end of the CAT 5 cable 2 Once you have cut a clean end on the cable, strip about an inch off the outer jacket from the cable using the wire-stripper portion of your crimping tool, as shown in the next illustration After stripping the outer jacket off, make sure that you have not cut into any of the individual wires If you have, cut a clean end off the cable again and start from the beginning
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