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Imagine taking a bus network and shrinking the bus down so it will fit inside a box Then, instead of attaching each PC directly to the wire, you attach them via cables to special ports on the box (Figure 2118) The box with the bus takes care of termination and all those other tedious details required by 798
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Figure 2118
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a bus network The bus topology would look a lot like a star topology, wouldn t it The central box with the bus is called a hub or switch The hub provides a common point for connection for network devices Hubs can have a wide variety of ports Most consumer-level hubs have 4 or 8, but business-level hubs can have 32 or more ports A hub is the old style device, still in use in many networks A switch is a newer, far superior version of a hub Figure 2119 shows a typical consumerlevel switch A hub provides no cure for the bandwidth-sharing problem of Ethernet networks If you put 32 PCs on a 32-port 100BaseT hub, you have 32 PCs sharing the 100 Mbps bandwidth A switch addresses that problem by making each Figure 2119 A switch port a separate Ethernet network Each PC gets to use the full bandwidth available, because a switch stops most collisions Bottom line Swap out your old hubs for newer switches and you ll dramatically improve your network performance Cheap and centralized, a star bus network does not go down if a cable breaks True, the network would go down if the hub itself failed, but that is very rare Even if a hub fails, replacing a hub in a closet is much easier than tracing a bus running through walls and ceilings trying to find a break!
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UTP cabling is the specified cabling for 10/100/1000BaseT and is the predominant cabling system used today Many different types of twisted pair cabling are available, and the type used depends on the needs of the network Twisted pair cabling consists of AWG 22 26 gauge wire twisted 799
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together into color-coded pairs Each wire is individually insulated and encased as a group in a common jacket CAT Levels UTP cables come in categories that define the maximum speed at which data can be transferred (also called bandwidth) The major categories (CATs) are as follows:
CAT 1 Standard phone line CAT 2 Data speeds up to 4 Mbps (ISDN and T1 lines) Data speeds up to 20 Mbps Data speeds up to 1 Gbps
CAT 3 CAT 5 CAT 6
Data speeds up to 16 Mbps Data speeds up to 100 Mbps Data speeds up to 10 Gbps
CAT 4 CAT 5e
Figure 2120
The CAT level should be clearly marked on the cable, as Figure 2120 shows The Telecommunication Industry Association/Electronics Industries Alliance (TIA/EIA) establishes the UTP categories, which fall under the TIA/EIA 568 specification Currently, most installers use CAT 5e or CAT 6 cable Although many networks run at 10 Mbps, the industry standard has shifted to networks designed to run at 100 Mbps and faster Because only CAT 5 or better handles these speeds, just about everyone is installing the higher rated cabling, even if they are running at speeds that CAT 3 or CAT 4 would do Consequently, it is beCable markings for CAT level coming more difficult to get anything but CAT 5, CAT 5e, or CAT 6 cables
Implementing 10/100/1000BaseT
The 10BaseT, 100BaseT, and 1000BaseT cabling standards require two pairs of wires: a pair for sending and a pair for receiving 10BaseT runs on CAT 3, CAT 4, or CAT 5 cable 100BaseT requires at least CAT 5 to run 1000BaseT is a special case because it needs all four pairs of wires in a CAT 5e or CAT 6 cable These cables use a connector called an RJ-45 connector The RJ designation was invented by Ma Bell (the phone company, for you youngsters) years ago and is still used today Currently, only two types of RJ connectors are used for networking: RJ-11 and RJ-45 (Figure 2121) RJ-11 is the connector that hooks your telephone to the telephone jack It supports up to two pairs of wires, though most phone lines use only one pair The other pair is used to support a second phone line RJ-11 connectors are primarily used for dial-up networking (see 22) and are not used in any common LAN installation, although a few weird (and out of business) network in a box type companies used them RJ-45 is the standard for UTP connectors RJ-45 has connections for up to four pairs and is visibly much wider than RJ-11 Figure 2122 shows the position of the #1 and #8 pins on an RJ-45 jack The TIA/EIA has two standards for connecting the RJ-45 connector to the UTP cable: the TIA/EIA 568A and the TIA/EIA 568B Both are
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