第5章设备端口简介.ppt

Purpose: This figure illustrates an unshielded twisted-pair RJ-45 connector. Emphasize: the RJ-45 has eight pins. Some are for tip (T) and some for ring(R). Emphasize: Make sure each student has seen a Cat 5 cable. Describe the test for straight through cable determination. If you hold the two ends of an RJ-45 cable side by side, youll see eight colored strips, or pins, at each end. If the order of the colored pins is the same at each end, then the cable is straight through. If the order of the colors is reversed at each end, then the cable is crossed over or rolled. Straight-thru Ethernet uses pins 1, 2, 3, and 6. Straight-thru cables are used for switch to router cabling, switch to PC or server cabling, or hub to PC or server cabling. Emphasize: Make sure each student has seen a Cat 5 cable. Describe the test for crossover cable determination. If you hold the two ends of an RJ-45 cable side by side, youll see eight colored strips, or pins, at each end. If the order of the colored pins is the same at each end, then the cable is straight through. If the order of the colors is reversed at each end, then the cable is crossed over or rolled. Ethernet uses pins 1, 2, 3, and 6. For crossover, pin 1 is connected to 3, and oin 2 is connected to 6. Crossover cables are used for switch to switch cabling, PC to PC cabling, switch to hub cabling, hub to hub cabling, or router to router cabling. Purpose: This figure describes a simple way to determine whether one should use a crossover or straight thru cable. Emphasize: Highlight the various cables and the devices they connect. Reference: for more information, the following URL providees more information on LAN cabling: /warp/public/701/14.html Also see the Cable Specifications appendix that is included in most Installation and configuration guides. Purpose: This figure highlights the WAN network. In this section, students will learn how to cable the WAN. Note: The figure illustrates two workgroup WANs. One is an