Computer Networks_Unit3_IP

Computer Networks_Unit3_IP - Computer Networks Unit 3...

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Unformatted text preview: Computer Networks Unit 3 Individual Project Guided vs. Wireless Media by Kregg Soltow Compare and Contrast Compare Guided (bounded) Information waves are guided along a solid medium such as a cable line. Twisted pair, coaxial cable, and optical fiber. Telephone Networks Within Buildings Local area Networks Cheap and Easy to work with / Low Data Rate and Short Range Analog or Digital Limited distance , Bandwidth, Data Rate Susceptible to interference and noise Optical Fiber (future choice) Greater Capacity Lower Attenuation Electromagnetic Isolation Greater Repeater Spacing Compare and Contrast Compare Wireless (unguided) Receiving and transmitting are achieved by means of antennas. Omni directional Radio Suffers from multi path interference Suffers Infrared Parabolic dish Parabolic Focused beam Focused Line of sight Line Long haul telecommunications Long Higher frequencies give higher data rates Modulate incoherent infrared light Modulate Line of sight or reflection Easily obstructed Satellite Link Point to point Multiple receive broadcast link Receives on one frequency / Repeats on another Requires Geo Stationary Orbit Types of Network Hardware Types Guided Optical Fiber Unshielded and Shielded TP Coaxial Cable Amplifiers Amplifiers Switch Boxes Repeaters Repeaters Light Emitting Diodes Injection Laser Diodes Wireless Radio Frequency Infrared Satellite Relay stations Signal receivers and transmitters Planetary Orbital Machinery 802.11 Wireless Routers Impairments Unshielded and Shielded TP Coaxial Cable Cheap, Low Data Rate, Short Range Limited Distance (Repeater every 2-3km) Limited Bandwidth (1MHz) Limited Data Rate (100MHz) External EM Interference Limited Distance (Repeater every 1km) High frequency (500-900MHz) Bandwidth and Data Rates up to 20 Mbps Optical Fiber Greater distances (Repeater spacing in the 10’s of km’s) Greater Data Rates (Hundreds of Gbps) 14-1,500 MHz Portions of Infrared and Visible Spectrum Impairments Impairments Radio Frequency Infrared Frequency Above 30MHz Line of sight Multipath Interference No coherent Light Line of sight Blocked by walls Above 1,200 MHz Satellite Distinct uplink and downlink frequency Atmospheric condition interference Above 1,000MHz Above 100Mbps References References Kaveh Pahlavan, Prashant Krishnamurthy, Networking Fundamentals John Kaveh Wiley and Sons, 2009 Stutzman, Warren L., and Gary A. Theiele. Antenna Theory and Design. Stutzman, Antenna 2nd Ed. New York: 1998 Bates, Regis J (2001). Optical Switching and Networking Handbook. New Bates, Optical New York: McGraw-Hill Kurkjian, Charles R. (1999). Strength variations in silica fibers. Kurkjian, Strength ...
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