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The various Ethernet standards referred to as, for instance, 10Base-2, 10Base-T, 100Base-T, and so on contain in their name all you need to know about what they do The first portion the number can be 10, 100, or 1,000, and this number indicates the data rate (in Mbps) that the standard carries The word Base means the network is baseband rather than broadband (A baseband connection only carries one signal at a time, while a broadband connection carries multiple signals at a time) The terminating letter or number indicates what sort of cable is used, with T denoting twisted-pair, 2 denoting thin coaxial, and 5 denoting thick coaxial Here s a quick reference guide to the different standards commonly seen: 10Base-2 10Base-5 10Base-T 100Base-T 100Base-TX 100Base-FX 1000Base-T 10Mbps, coaxial (RG-58) cable 10Mbps, coaxial (RG-8) cable 10Mbps, twisted-pair (two pairs, Cat-3 or higher) cable 100Mbps, twisted-pair (four pairs, Cat-5) cable; also called 100Base-T4 to designate four pairs 100Mbps, twisted-pair (two pairs, Cat-5) cable 100Mbps, fiber-optic cable 1Gbps, twisted-pair (four pairs, Cat-5) cable
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Most communications and network devices, including those designed to use RJ-45 connectors, are either data communications equipment (DCE) or data terminal equipment (DTE) If you have DTE equipment on one end, you need DCE equipment on the other In a way, it s just like screws and nuts Two screws don t go directly together and neither do two nuts The same principle applies here: DCE equipment can t talk directly to other DCE equipment, nor can DTE equipment talk directly to DTE equipment The RJ-45 jack on a hub is DCE, while the RJ-45 jack on a computer s NIC is DTE You cannot communicate between DCE and DCE devices or between DTE and DTE devices using a standard twisted-pair/RJ-45 cable that has been wired as described in Table 4-1 For instance, you cannot use a standard twisted-pair patch cable to connect directly from a network server to a workstation, or between two workstations, because those are all DTE devices Instead, you must purchase or prepare a crossover cable that compensates for having, say, two DTE devices connect directly to each other For 10Base-T networks, Table 4-2 shows you the wiring needed for a crossover cable
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10Base-T Use Transmit negative Transmit positive Receive negative N/A N/A Receive positive N/A N/A
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Table 4-1
10Base-T Wire Assignments
4:
Understanding Network Cabling
Pin 1 2 3 6
Wire Base Color White Orange White Green
Wire Stripe Color Orange White Green White
Pin 1 2 3 6
Wire Base Color White Green White Orange
Wire Stripe Color Green White Orange White
Table 4-2
Twisted-Pair/RJ-45 Crossover Cable Wiring
TIP: You can easily purchase all the tools and parts needed to make twisted-pair/RJ-45 cables, and you should do so if you manage a network of any appreciable size (more than 50 workstations) Learning to use these tools and parts to make patch cables or to replace a failed cable can quickly become invaluable This way, you can quickly make cables of any length you need However, even though you should be able to do this, you re better off purchasing premade twisted-pair/RJ-45 cables to use with your network Professionally made cables are more reliable and should give you fewer problems than the ones that you make yourself Make your own cables when you re in a pinch
What s All This About Cable Categories
Twisted-pair network cables are rated in terms of their capability to carry network traffic These ratings are defined by the Electronics Industry Association (EIA) and are referred to as Levels 1 and 2, and Categories 3, 4, and 5 The different category levels are simply called Cat-3 through Cat-5 Table 4-3 shows the rated performance for each of these levels
Level or Category Level 1 Level 2 Category 3 Category 4 Category 5
Rated Performance Not performance-rated 1Mbps 10Mbps 16Mbps 100Mbps
Table 4-3
Twisted-Pair Performance Designations
Networking: A Beginner s Guide, Second Edition
Plenum Versus Nonplenum Cable
In a building, the area between the ceiling of the rooms and the roof of the building is called the plenum space Most buildings use ducts (big, flexible hoses) to provide conditioned air to the rooms in the building and they use the open plenum space for air returned from the rooms Occasionally, a building uses ducts for the return air, but the standard for office space is simply to use the plenum space Why is this important in this chapter about cables Because to run network cable in a building that uses the plenum for return air, you must either install the cable inside conduit (which is extremely expensive) or use plenum-grade cable The difference between nonplenum cable and plenum cable is that the plastics used in plenum cable do not give off toxic fumes in a fire Make sure to check with your cabling contractor for details about the municipality in which you are installing network cable, but virtually all local codes in the United States require conduit or plenum-level cable for buildings with plenum air returns In addition to choosing the right kind of cable, it s also important for the cable installer to be familiar with, and comfortable with, doing any required wall penetrations that cross one-hour fire-rated corridors or building fire zones Those wall penetrations must be properly sealed to maintain the building s fire ratings
NOTE: An update to the Category 5 specifications is called Category 5E (Cat-5E for short) The changes added to Cat-5E update the electrical specifications somewhat; Cat-5E cables and components are preferred over Cat-5 cables and components
To achieve a particular performance rating, you not only need cable certified to that performance level, but you must observe other requirements, including using connectors and patch cables that also meet the level of performance that you want to achieve For example, for a Cat-5 installation, you must have Cat-5 cable, connectors, patch panels, and patch cables The entire circuit, from the end at which the client computer connects to the other end at which the hub connects, needs to be tested and certified to the performance level that you need to achieve
TIP: You can use higher-rated cable systems for networks with lower requirements For example, common practice these days is to use Cat-5 cable for all network wiring, even if the network uses only 10Base-T at 10Mpbs and only needs Cat-3 cable Using the higher-grade cable makes good sense because cable plants are expensive to replace, and if you use Cat-5 cable, you won t have to replace the network cabling when the network is upgraded eventually to 100Base-T or some higher standard Also, Cat-5 cabling components are of higher quality than Cat-3 components, so your network cabling is likely to be more reliable
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