Figure 116 EIATIA232 Cable Assembly

Part II, "Supporting IP and IPX," and Part III, "Supporting Ethernet, Switches, and VLANs," of this the Physical Layer and Data Link Layer as they relate to LANs/WANs in more detail. In addition, yo out the following cable sites on your own:

www.belkin.com

www.stonewalluable.com

Now look at s ome practical applicatio n of the Phy sical L ayer. Do you know when to use a straight-t compared to a crossover cable? Perhaps a better question is what is a crossover cable? A straight-t is wired pin 1 to 1, 2 to 2, 3 to 3, and 6 to 6. A crossover is 1 to 3 and 2 to 6; it crosses between a Generally spea king , unlike devices require a straight-thmugh cable, whereas like devices require a cable. Repeat th i s rule to yourself as you review Table I-I1. As with any rule, exceptions apply. Th the cable documentation that comes with your switch or router. For example, a hub may have an u when in t lie normal posi^on it requires a crossov er cable to c onnect two devi ces together. When in position, the cross is already performed in the device hardware and a straight-through cable is app Many of the Cieco sw itc h ports are de signated with an X above the port or a media dependent inter (MDI/MDI-X) toggle and some are not. Connecting two devices with Xs normally means they are li you need which kind of cable? Check your answer in Table 1-15.

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