Ethernet Networking- P4

Ethernet Networking- P4:One of the biggest problems when discussing networking is knowing whereto start. The subject of computer networks is one of those areas for whichyou have to "know everything to do anything." Usually, the easiest way toease into the topic is to begin with some basic networking terminology andthen look at exactly what it means when we use the word Ethernet.
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Ethernet Networking- P478 Creating Network Segments to the network. A UTP patch cable (a short length of cable with an RJ-45 plug on the end) runs from each computer to the wall jack. In most cases, you want to run the patch cables under carpeting or from a desktop directly to a wall so that people are less likely to trip. (One hopes that common sense prevails in all such things .... ) Figure 4-19: An office floor plan showing network wiring and the wiring closetWhere Do You Put It? Wiring Closets, Walls, Floors, and CeilingsmOh, My! 79 Note: The symbol that appears on some lines in the di- agram indicates that the line represents UTP wiring. A file server and a Fast Ethernet switch are housed in a wiring closet. UTP cabling runs from each wall outlet, above a dropped ceiling, and into the wiring closet, which is secured with some type of smart lock. (A smart lock, at the very least, supports giving each person who should have access to the room a different entry code and records when each code is used to enter and exit.) The UTP cabling that runs from the wall jacks to the switch has RJ-45 plugs at the ends that plug into the switch. The cables are wired into con- nectors that are then inserted into the wall plates. The cables are run in the ceiling space above the ceiling tiles and dropped down the wall spaces to where the wall plates will be attached. Is this a do-it-yourself job? That de- pends on how comfortable you are with climbing up and down ladders to run the cabling in the ceiling and how comfortable you are with wiring the connectors. (For details on the wiring process, see the appendix to this chapter. If you wont be involved with the hands-on wiring process, you can just skip that material.) What can you do if you dont have a dropped ceiling? You will need to run the cables along the floor or through the attic. You can hide cables under carpets, or use cable protectors that you can purchase; the latter allows the cable to lie on top of the floor, regardless of its type. As an example, look at the small piece of cable protector in Figure 4-20(a). The cables run down the middle, in channels hidden under the hinged door. The size and number of channels vary, depending on the type of protector you purchase. (The di- agram in Figure 4-21 shows three cable channels.) Given that the type of cable protector you purchase depends on the specific wiring you are trying to hide, you should definitely plan your wiring before running out to pur- chase the cable protectors. Alternatively, if you are in a lower traffic area, you can use cable protectors that simply drop down on top of your cables (Figure 4-2 lb). If you have a crawl space under the floor and can drill holes in the floor, you can run the wiring underneath the floor; alternatively, you can go through an attic above the ceiling. The worst-case scenario is that you have a leased office that cant be modified structurally in any way. Then youll80 Creating Network Segments Figure 4-20: A small section of cable protector (Courtesy of Peterson Systems International) Figure 4-21: A cross section of a cable protector, showing three channels for running the cables (Courtesy of Peterson Systems International) need to lay your cables on the floor and protect them with cable protectors. Long cable runs in the junction between the wall and the floor work w e l l ~ until you come to a d o o r ~ i n which case you can go over and around the door. Not elegant, but it works and keeps the cables out of the way of feet!Appendix: Wiring RJ-45 Plugs and Connectors 81 Note: The diagram in Figure 4-19 was created with a pro- gram called ConceptDraw NetDesigner. It is one of sev- eral products that provide tools and images for drawing network layouts and floor plans. (Others include Microsoft Visio and SmartDraw.) I like this one because its easy to use and inexpensive, and it comes in a Macin- tosh version.Appendi ...