4. Evolution of the Internet 1945 1995 Memex Conceived 1945 WWW Created 1989 Mosaic Created 1993 A Mathematical Theory of Communication 1948 Packet Switching Invented 1964 Silicon Chip 1958 First Vast Computer Network Envisioned 1962 ARPANET 1969 TCP/IP Created 1972 Internet Named and Goes TCP/IP 1984 Hypertext Invented 1965 Age of eCommerce Begins 1995
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7. Types Of Internet Connections Broadband Technologies Wireless 3G Mobile Wireline Wi-Fi (Wireless Fidelity) LMDS & MMDS FSO (Free Space Optics) Satellite DSL (Digital Sub’s Line) Cable Modem Optical Fibre Technologies PLC (Power Line Communication) WiMAX
19. OFDM Spread Spectrum Techniques (FH and DS) Single Carrier Spectral Efficiency Good Poor Moderate Robustness Against Channel Distortions Excellent Not Good Good Robustness Against Impulsive Noise Fair Fair Good Ability to adapt to channel changes Excellent Fair Good Implementation Costs (Equalizers, etc.) Fair Poor Poor (Equalizers required)