Twisted pair categories 605 708 similar to coaxial

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Twisted Pair Categories 6:05-7:08 Similar to coaxial cables, there are also different types of twisted pair cabling called categories. A twisted pair cabling's category defines several aspects of the cable including its transmission specifications and intended use. Now if you were to simply look at a twisted pair cable it would be hard to identify which category of cable it was, they all look the same. However, almost all twisted pair cabling prints the category on the outer sheath of the cable and it looks like this. The word CAT, short for category, followed by a number. Twisted pair cabling categories range from three up to eight with variations in between. The most common categories of twisted pair are CAT5E, which stands for enhanced, and CAT6. CAT5E supports speeds of up to one gigabit per second. It's able to do this because the wires are twisted much tighter than lower category cables, which reduces cross-talk. CAT6 cables support 10 gigabits per second transfer speeds and are typically used in high-speed network and broadband infrastructures. Twisted Pair Connectors 7:09-7:45 To connect twisted pair cables to devices, an RJ45 connector is used, which looks like this. RJ45 connectors have eight pins that connect to the four wire pairs in a cable. Another less common connector used with twisted pair cabling is the RJ11 connector. With only four pins, this connector looks like a miniature RJ45 connector. RJ11 connectors are typically used with category one twisted pair cabling, which is the cabling used for telephone communications.Both RJ11 and RJ45 connectors are attached to cables using a special crimping tool. Advantages and Disadvantages 7:46-8:42
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Now there's a reason the majority of networks use twisted pair cabling for networks. UTP twisted pair cables are very cheap. UTP CAT5E cables can be as cheap as three cents per foot. Twisted pair cabling is also very flexible, making it easy to work with. It also offers excellent transfer speeds with theoretical speeds of up to 40 gigabits per second. However, twisted pair cabling sometimes isn't the best choice. Twisted pair cables are very susceptible to EMI and a lot of things generate EMI including fluorescent lights, power lines, industrial equipment, elevators, the list goes on and on. Even when using STP twisted pair cables interference can be an issue. Another weakness with twisted pair cable has to do with security. Remember, twisted pair cables emit a small amount of EMI. This EMI can actually be picked up by special devices and be used to eavesdrop on the communications. Fiber Optic 8:43-10:19 There's one more bounded network medium that you need to be familiar with, fiber optic. Fiber optic cabling is quite a bit different from coaxial or twisted pair. Instead of using electrical signals to transmit data, fiber optic cabling uses light pulses.
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