The insulator surrounds the inner conductor and keeps

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The insulator surrounds the inner conductor and keeps the signal separated from the mesh conductor. It is made of PVC plastic. The braided mesh conductor is a second physical channel and also functions as a ground. It is made of aluminum or copper-coated tin. The sheath is made of PVC plastic and encases the cable, protecting it from external elements. Coaxial cable has the following advantages and disadvantages: Advantages Disadvantages
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Less susceptible to electromagnetic Interference (EMI) Resistant to physical damage Large existing infrastructure Expensive Not very flexible (difficult to bend around corners) Using splitters degrades signal quality The table below describes the different coaxial cable grades. Type Uses Resistance Rating RG-59 CCTV video systems; short cable lengths (less than 3 meters) are sometimes used for cable TV 75 ohms RG-6 Cable TV, satellite TV, and broadband cable Internet 75 ohms Because RG-6 is able to carry a higher-quality signal with much lower signal loss than RG-59, RG-6 cabling should always be used for any coaxial cable implementation. The following table describes the two most common types of connectors used with coaxial cable Connector Description F-Type Crimped onto the cable using a special tool Used to create cable and satellite TV connections Used to connect a cable modem to a broadband cable connection Some F-Type connectors can be twisted onto a cable without needing a special tool. However, these types of connectors can cause signal leakage. BNC Molded onto the cable Used in legacy 10Base2 Ethernet networks Used in specialized industries Used to connect composite video displays on commercial video devices. Twisted pair cables support a wide range of fast, modern network standards. Twisted pair cabling is composed of the following components: Four pairs of copper wires carry the data signals (one wire in the pair carries a positive signal, the other carries a negative signal). Wires are twisted into pairs to reduce the effects of electromagnetic interference and crosstalk. PVC plastic insulation surrounds each copper wire.
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An outer plastic sheath bundles the wires together and protects them. o Unshielded twisted pair (UTP) has only an outer plastic sheath. UTP cables are easier to work with and are less expensive than shielded cables. o Shielded twisted pair (STP) has a grounded outer copper shield around the entire wire bundle or around each wire pair. STP provides additional EMI protection, but costs considerably more than UTP. Twisted pair cable has the following advantages and disadvantages: Advantages Disadvantages Inexpensive compared to other media types Easy to install and manage Very common (media and tools are easy to obtain) The most common (and most supported) network medium Very susceptible to EMI Cables are easily damaged Vulnerable to eavesdropping The table below describes the different unshielded twisted pair (UTP) cable categories.
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