COMM 3601 Industry Segments u Peripherals –storage devices –ZIP, tape backup u components –key boards, video multi-use, converging

COMM 3602 Industry Segments u Software –pre-packaged –network-based

COMM 3603 Technology Trends u Multimedia –the next "killer ap“ –Drives sales and innovation

COMM 3604 Technology Trends u PDAs (personal data assistants) –crashed, then resurrected –Different companies dominate – Palm, Casio, Mindspring –tied to Internet, wireless phone

COMM 3605 Technology Trends u Videoconferencing –Net chat –Internet phone u Wireless videophones u Virtual Reality –military, medicine –net chat

COMM 3606 Information Service Provider u Creates content u Maintains editorial control u Delivered through distribution network u Can be: –entertainment –information –interactive service

COMM 3607 Common Carrier u Channel –distribution device or network u Carries all messages –service available to all on equal basis –non-discriminatory pricing/carriage u No direct financial interest in content

COMM 3608 u What is the importance of ego or personality in technology development? u What were the key problems Xerox PARC and Apple were trying to solve? u What is the role of Bill Gates and Steve Jobs in software development? u Why isn’t Xerox a key player in computers today?

COMM 3609 Who is this man?

COMM Telephone Technology u Variable resistance transmitter – beaker, magnet, rod, speaker u Audion tube – borrowed from radio invention

COMM Telephone Transmission u 1915 Transcontinental u 1918 Multiplexing – 2 or more signals down the same wire at the same time u high frequency 'carrier wave'

COMM Telephone Transmission u 1948 Microwave – adapted from military radar transmission – line of sight u 1962 Satellites – Telstar – microwave in the stratosphere – geosynchronous orbit – remedies line of sight problem

COMM Telephone Switching u 1892 Strowger – automatic telephone switch – mechanical u AT&T adopts in 1920s – self-dial --> leads to phone numbers – 1 call per switch

COMM Telephone Switching u 1938 Crossbar Switch – multiple calls per switch; used in local & long distance by 1951

COMM Telephone Switching u 1965 Electronic Switches installed – computer circuit (later a chip) replaces mechanical arms – computer program routes calls

COMM Transmission - Fiber Optics u Laser invented u ultra-transparent fiber u First fiber optic system - Chicago u First transatlantic fiber cable

COMM Transmission - Fiber Optics u Laser shines down path of glass u Digital signal created by pulses of light u Huge expansion of bandwidth

COMM ISDN/DSL digital to the home multi-tasking 'intelligent network' Transmission – Dedicated Line

COMM Digital Switch u Phone system becomes a large computer network u Packet Switching u De-centralized network u Digital system is still generally 'between the switches' – MODEM device

COMM Common Carrier/Service Provider Telephone Lines ISP ‘CLASS’Service Provider Web Pages Data Music