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acceptable You do not have to follow any standard as long as you use the same pairings on each end of the cable; however, you will make your life simpler if you choose a standard Make sure that all of your cabling uses the same standard and Table 181 UTP Cabling Color Chart you will save a great deal of Pin 568A 568B Pin work in the end Most importantly, keep records! 1 White/Green White/ 5 Orange Like all wires, the wires in UTP are numbered However, a 2 Green Orange 6 number does not appear on each 3 White/ White/ 7 wire Instead, each wire has a Orange Green standardized color Table 181 4 Blue Blue 8 shows the official TIA/EIA Standard Color Chart for UTP Combo Cards All Ethernet networks share the same language, so you can easily have mixed or combined networks All it takes is a network card capable of running at multiple speeds or even over multiple cables Most NICs built into motherboards (Figure 1823), for example, are 10/100 auto-sensing cards If you plug into a 10BaseT network, they automatically run at 10 Mbps If you log into a 100 Mbps network, they ll quickly ramp up and run at 100 Mbps You might find older cards that have both an RJ-45 port and a BNC connector for 10Base2 These sorts of cards can connect to either a 10BaseT or 10Base2 network (Figure 1824) Hubs and Switches In a 10/100/1000BaseT network, each PC is connected to a 10/100/1000BaseT hub or switch, as mentioned earlier To add a device to the network, simply plug another cable into the hub or switch (Figure 1825) Remember that 10/100/1000BaseT uses the star bus topology The hub holds the actual bus and allows access to the bus through the ports Using a star bus topology creates a robust network; the failure of a single PC will not bring down the entire network
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Tech Tip
Plenum versus PVC Cabling
Most workplace installations of network cable go up above the ceiling and then drop down through the walls to present a nice port in the wall The space in the ceiling, under the floors, and in the walls through which cable runs is called the plenum space The potential problem with this cabling running through the plenum space is that the protective sheathing for networking cables, called the jacket, is made from plastic, and if you get any plastic hot enough, it will create smoke and noxious fumes Standard network cables usually use PVC (poly-vinyl chloride) for the jacket, but PVC produces noxious fumes when burned Fumes from cables burning in the plenum space can quickly spread throughout the building, so you want to use a more fire-retardant cable in the plenum space Plenum-grade cable is simply network cabling with a fire-retardant jacket and is required for cables that go in the plenum space Plenum-grade cable costs about three to five times more than PVC, but you should use it whenever you install cable in a plenum space
Figure 1823
NIC built into motherboard
Figure 1824
Ethernet 10Base2/10BaseT combo card
18: Understanding Networking
Figure 1825
Typical switch with several cables connected
Figure 1826
10/100/1000BaseT
Tech Tip
Crossover Cables
You can actually hook two 10/ 100/1000BaseT network cards together without a hub by using a special UTP cable called a crossover cable A crossover cable is a standard UTP cable but with one RJ-45 connector using the 568A standard and the other using the 568B This reverses the signal between sending and receiving wires and thus does the job of a hub or switch Crossover cables work great as a quick way to network two PCs You can purchase a crossover cable at any computer store
In a 10/100/1000BaseT network, the maximum distance from the hub to any device is 100 meters No more than one PC can be attached to each segment, and the maximum number of PCs that can be attached to any one hub is 1024 although you will be hard pressed to find a hub with that many connectors (Figure 1826) Most hubs come with 4, 8, 16, or 24 ports 10/100/1000BaseT hubs act as repeaters, turning received signals into binary data and then re-creating a new signal to send out to devices connected to other ports They need power, so make sure that the hubs are plugged into a good power source Duplex and Half-Duplex All modern NICs can run in full-duplex mode, meaning they can send and receive data at the same time The vast majority of NICs and switches use a feature called auto-sensing to accommodate very old devices that might attach to the network and need to run in half-duplex mode Half-duplex means that the device can send and receive but not at the same time The walkie-talkies you played with as a kid that required you to press and hold the orange button to transmit at which time you couldn t hear anything are an obvious example of a half-duplex device Half-duplex devices are exceedingly rare in modern computers, but you need to understand this option Some NICs just can t handle full-duplex communication when you plug them directly to another NIC using a crossover cable that is, no switch Dropping both NICs down from full-duplex or auto-sensing can sometimes enable these odd NICs to communicate
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