c# barcode scanner text box Figure 5-7 Unshielded twisted-pair (UTP) cabling used with an RJ-45 plug in Software

Drawing Code 39 Full ASCII in Software Figure 5-7 Unshielded twisted-pair (UTP) cabling used with an RJ-45 plug

Figure 5-7 Unshielded twisted-pair (UTP) cabling used with an RJ-45 plug
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can handle four twisted pairs of wires, is similar to but slightly larger than the RJ-11 connector, which can handle two pairs of wires and is used in a normal phone connection 100BaseT and 1000BaseT use four pairs or all eight wires in Category 5 cable and the same RJ-45 connector The pairs of wires in a UTP cable are twisted because that reduces the electrical interference that is picked up in the cable The number of twists per foot has become a very exact science, and it is important to keep the cable properly twisted up close to the connector An alternative to UTP is STP, with various degrees of shielding: shielding around each pair, shielding around all pairs, or shielding around both the individual pairs and around the combination STP is considerably more expensive than UTP and is more difficult to handle To handle the interference problem, follow these rules when running the cable: Don t run the cable near a fluorescent light fixture Don t run the cable near an electrical motor, such as those in machines, fans, water coolers, and copiers Don t run the cable alongside a power cable Don t make tight turns that can crimp the cable Don t use a staple gun, which can crimp or short-circuit the cable
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TIP Crimping network cabling can change the spacing between individual wires and therefore change its electrical characteristics and performance Between voice and data (phone and network), a number of different types of UTP cable exist The differences are in the degree of fire resistance, in the type of inner core, and in the grade or category of cable, which also specifies the number of twisted pairs Degree of Fire Resistance UTP cables come in two degrees of fire resistance: plenum cable, marked CMP on the side of the cable, and PVC or riser cable, marked CMR Plenum cable, which often has a Teflon coating, is more fire resistant and doesn t give off dangerous fumes if it does burn PVC or riser cable, while reasonably fire resistant, is made with polyvinyl chloride (PVC), which gives off potentially dangerous fumes if it does burn Plenum cable costs roughly twice what PVC cable costs, but it can be used in air passages such as raised floors and suspended ceilings, while PVC cable can be used only in walls and out in the open (check your own local codes for the type of cable you should use) Type of Inner Core The inner core of UTP cable can be stranded or solid Stranded wire is more flexible and less prone to breaking when bent a number of times It is used in situations where it is frequently moved, such as in a patch panel and between a wall outlet and a computer Solid wire has lower signal loss and therefore is better for longer runs where it won t be moved frequently, such as in walls and ceilings
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UTP Categories The following are the seven categories of UTP cable that are used with voice and data communications: Category 1 pairs Used in telephone installations prior to 1983, it has two twisted
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Category 2 Used in telephone installations after 1982, it has four twisted pairs; it is used in some early data networks with speeds up to 4 Mbps Category 3 Used in many early data networks and most current phone systems It normally has four twisted pairs, but can have as few as two twisted pairs and as many as 100 Generally it has three twists per foot (not in the specs), and easily handles network speeds of 10 Mbps with a bandwidth of 16 MHz Category 4 Used in Token Ring networks, it has four twisted pairs and can handle speeds up to 16 Mbps with a bandwidth of 20 MHz Category 5 Used in most networks until the mid-1990s, it has four twisted pairs, has eight twists per foot, and can handle 100 Mbps with a bandwidth of 100 MHz Category 5e (enhanced Category 5) Used in almost all current networks, it has the same physical characteristics and bandwidth as Category 5 but with a lower error rate It can be used with Gigabit Ethernet Normally unshielded, it can also be shielded Category 6 Built to go beyond Gigabit Ethernet and required for 10 Gigabit Ethernet, Category 6 has a bandwidth of 200 MHz, twice the bandwidth of Category 5e, with a lower error rate It can be unshielded, but it is often shielded and used where electrical interference is a problem Shielded Category 6 has four twisted pairs with a foil wrap around each pair and another foil wrap around all pairs
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Connect UTP UTP cabling simply plugs into a network adapter and then into a wall outlet, hub, switch, or router, making 10/100/1000BaseT installation very simple, as you can see in Figure 5-8 For UTP to work between two computers without a hub or switch, the wires must be crossed over the transmitting wires on one computer must become the receiving wires on the other computer This is one of the functions of a hub, so the wires connecting a computer to a hub must be the same on both ends When two computers are directly connected to each other, a special cable must be used that has the end connections reversed TIP The rules of thumb used to stay within the 328-foot (100-meter) limit for a 10/100/1000BaseT segment are to keep the cable run from the wiring closet to the wall outlet at less than 300 feet, the run from the wall outlet to the computer at less than 20 feet, and the patch panel at less than 8 feet
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