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N etworking w ireless media

N etworking w ireless media. Common network cables. The connection between the source and destination may either be direct or indirect, and may span multiple media types . Copper Media Optical Media Wireless Media. Wireless Frequency. Wireless APs operate at: 2.4 GHz 5 GHz

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N etworking w ireless media

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  1. Networking wireless media

  2. Common network cables • The connection between the source and destination may either be direct or indirect, and may span multiple media types. • Copper Media • Optical Media • Wireless Media

  3. Wireless Frequency • Wireless APs operate at: • 2.4 GHz • 5 GHz • 2 GHZ! That’s the same as my microwave oven, isn’t that dangerous? • Answer: No. • Electromagnetic waves happen naturally. • Light is an electromagnetic wave • It is not the frequency, but the wattage, the power. • Any electromagnetic wave can be dangerous with too much power. • A 25 watt light bulb is safe, but it wouldn’t be safe at 250,000 watts • Wireless access points generate signals at 1/10th of a watt. • Like all electromagnetic waves, the signal does not fade in a linear manner, but inversely as the square of the distance.

  4. Rick Graziani graziani@cabrillo.edu

  5. Inverse square law 10 20 30 40 50 100 • Double the distance of the wireless link, we receive only ¼ of the original power. • Triple the distance of the wireless link, we receive only 1/9 the original power. • Move 5 times the distance, signal decreases by 1/25. Point A 10 times the distance 1/100 the power of A 3 times the distance 1/9 the power of Point A 2 times the distance ¼ the power of Point A 5 times the distance 1/25 the power of Point A

  6. Putting it in some perspective • Measurements from an antenna transmitting 100mW at 1 inch • Remember a milliwatt is 1/1,000th of a Watt • Microwave oven typically operates at 1,000 watts in a confined space. 1” 100 mW 1/10th watt 2” 25 mW 1/40th watt 4” 6.25 mW 1/166th watt 8” 1.56 mW 1/1000th watt 16” 0.39 mW 4/10,000th watt 32” 0.097 mW 1/10,000th watt 64” (5.3 ft) 0.024 mW 2/100,000th watt 128” (10.6 ft) 0.006 mW 6/1,000,000th watt 256” (21.3 ft)0.0015 mW 15/10,000,000th watt • Light bulbs would also be dangerous the were 10,000 to 1,000,000,000,000 stronger. • A 250,000 watt up to a 250,000,000,000,000 watt light bulb would also be dangerous.

  7. Wireless 802.11 n • Wireless N provides better speeds (bandwidth) and better range by utilizing multiple antennas. • Backwards compatible with 802.11 b and g.

  8. 802.11n

  9. Wireless 802.11 ac • More reliable • Better Speed • Better Range • Steady Connection • Ideal for video steaming or gaming

  10. Wireless 802.11 ac Next Generation Gigabit Wi-Fi • Key advantages of 802.11ac over 802.11n: • Gigabit speed wireless with approximately 3 times the performance of 802.11n • Better performance at any range with fewer dead spots • More reliable connections for media streaming with beam-forming • More Wi-Fi bandwidth on your mobile • Only utilizes the 5 GHz Band, which is less prone to interference • Backward compatible to 802.11 a & n, which also use the 5 GHz band

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