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Educational Educational TelecommunicationsTelecommunications
by Gerald Knezek
Professor of Technology & CognitionUniversity of North Texas
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TelecommunicationsTelecommunications
Tele - at a distance
Communications - exchange of information
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TelecommunicationsTelecommunications
Communications over distance or time
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Modes of CommunicationModes of Communication
Simplex– broadcast radio, TV
Half Duplex– speakerphone
Full Duplex– telephone
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Types of Telecommunication Types of Telecommunication Systems Systems
Audio
Video
Data
Combinations
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AudioAudio
Broadcast Radio
Two-way Radio
Audio Teleconferencing
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VideoVideo
Broadcast Television
Slow-Scan TV
Two-Way Videoconferencing
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DataData
Computer-Mediated Communication– Asynchronous (E-mail)– Synchronous (Chat Mode)
Computer Conferencing
Computer-Supported Collaborative Work
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Required Data Comm. Required Data Comm. EquipmentEquipment
Computer
Modem(modulator - demodulator)
Terminal Emulation Software
Phone Line
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Combination Data/Graphics Combination Data/Graphics SystemsSystems
Information Retrieval Services– interactive access to (primarily) text– Source, Compuserve, Dow Jones
Teletext– one-way text and graphics; Prestel (UK) – stock market quotations– severe weather alert
(continued)
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(continued)
Videotex– Prodigy, U.S. Videotel– two-way interactive retrievel of text and graphics
Audiographics– text, sound and graphics via computer workstation– electronic blackboard
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TeleconferencingTeleconferencing
Audio
Video– includes audio
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Distance EducationDistance Education
Distance Learning
Distance Teaching
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Distance Education Delivery Distance Education Delivery SystemsSystems
LIFT Model– Live, Interactive, Facilitated TV– Satellite Based– TI-IN
(continued)
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(continued)
Modem Courses– Submit homework via Email– TCJC
Two-Way Audio/Video– video teleconference– UNT PDC, VTEL
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Computer NetworksComputer Networks
Cluster – less than 30 machines– near to each other
LAN– local area network– less than 9 miles
(continued)
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(continued)
MAN– metropolitan area network– less than 50 miles
WAN– wide area network– greater than 50 miles
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InternetInternet
Network of networks
All use TCP/IP protocols
(continued)
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(continued)
Support basic services– Email (SMTP)– Telnet– FTP
Supports numerous servers and clients– JOVE Unix system at UNT, Tenet in Austin– Listservs– Gopher, WWW, etc.
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Simple Curricular Enhancements Simple Curricular Enhancements via Emailvia Email
NGS Kids Network
ATT Learning Network
TERC’s Global Lab
TCET’s Air/Water Project
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The End