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NOTE Have you ever picked up a telephone and heard a distinct crackling noise That s an example of crosstalk

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Shielded twisted pair (STP), as its name implies, consists of twisted pairs of wires surrounded by shielding to protect them from EMI STP is pretty rare, primarily because there s so little need for STP s shielding; it only really matters in locations with excessive electronic noise, such as a shop floor with lots of lights, electric motors, or other machinery that could cause problems for other cables Figure 3-21 shows the most common STP type: the venerable IBM Type 1 cable used in Token Ring network technology

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Unshielded twisted pair (UTP) is by far the most common type of network cabling used today UTP consists of twisted pairs of wires surrounded by a plastic jacket (see Figure 3-22) This jacket does not provide any protection from EMI, so when installing UTP cabling, you must be careful to avoid interference from light, motors, and so forth UTP is much cheaper than, and in most cases does just as good a job as, STP

Of course, we can also add the real and imaginary parts of the two functions:

2 (2916M XL and 2924M XL only)

Although more sensitive to interference than coaxial or STP cable, UTP cabling provides an inexpensive and flexible means to cable networks UTP cable isn t exclusive to networks; many other technologies (such as telephone systems) employ the same cabling This makes working with UTP a bit of a challenge Imagine going up into a ceiling and seeing two sets of UTP cables: how would you determine which is for the telephones and which is for the network Not to worry a number of installation standards and tools exist to help those who work with UTP get the answer to these types of questions Not all UTP cables are the same! UTP cabling has a number of variations, such as the number of twists per foot, which determine how quickly data can propagate on the cable To help network installers get the right cable for the right network technology, the cabling industry has developed a variety of grades called category (CAT) ratings CAT ratings are officially rated in megahertz (MHz), indicating the highest frequency the cable can handle Table 3-1 shows the most common categories

The product of two complex functions of a single real variable can be integrated as follows:

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3-slot chassis (one slot for supervisor engine and two slots for switched port modules); one chassis can support