copper media kyle, tyler, james, ben. atoms and electrons electrons-particles with a negative charge...
TRANSCRIPT
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Copper Media
Kyle, Tyler, James, Ben
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Atoms and Electrons
• Electrons-particles with a negative charge the orbit the nucleus
• Protons-particles with a positive charge• Neutrons-neutral particles with no charge• Coulomb’s law-opposite charges attract and like
charges repel• The Bohr Model-Protons have positive charges
and electrons have negative charges. There is more than one proton in the nucleus
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Voltage
• Referred to electromotive force (EMF)
• Voltage is represented by the letter V and sometimes for the letter E for electromotive.
• The unit of measurement for voltage is volt (V)
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Resistance and Impedance
• Insulators-don’t allow the current to flow or restrict the flow.
• Conductors-offers very little or no resistance of the current flow.
• Semiconductors-can control the flow of the current.• The letter R represents resistance and the unit or
measurement for resistance is the ohm.
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Current
• Electrical current (I)- the flow of charges created when electrons move.
• Current is measured in Ampere (A)
• Voltage and amperage equals wattage.
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Circuits
• Circuit- closed loops which current flows.
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Cable Specifications
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Cable Specifications
• Effects the speed of data transmission• Allows the transmission to be digital or
analog• Cable types:
– 10BASE-T – 10BASE5– 10BASE2
• 100BASE-T allows the media to be boosted to the maximum 100 meters
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Coaxial Cables
• It can run longer than shielded twisted pair wires.
• Its mainly used for cable television.
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STP Cable
• Reduces electronic noise EMI and RFI• Most be grounded at both ends.
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UTP Cable
• UTP cables rely on cancellation to reduce signal degradation caused by EMI and RFI
• Cheaper and easier to run than coaxial.
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Straight through Cable
• The Straight-through cable is the cable that connects the switch port to the computer NIC port. Exp. Orange to orange, blue to blue, dotted green to dotted green and so on.
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Crossover Cable
• A cross over cable connects one switch port to another switch port. Exp. Green switches with orange, dotted green switches with dotted orange, Blue and Brown remain the same.
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Rollover Cable
• Rollover Cable is the cable the connects the RJ-45 adapter on the com port of the computer to the router port or switch port. Exp. Orange to dotted brown, dotted blue to blue, and so on.