educational telecommunications by gerald knezek associate professor of technology & cognition...
TRANSCRIPT
Educational Educational TelecommunicationsTelecommunications
by
Gerald Knezek
Associate Professor of Technology & Cognition
University of North Texas
TelecommunicationsTelecommunications
Tele - at a distance
Communications - exchange of information
TelecommunicationsTelecommunications
Communications over distance or time
Modes of CommunicationModes of Communication
Simplex– broadcast radio, TV
Half Duplex– speakerphone
Full Duplex– telephone
Types of Telecommunication Types of Telecommunication Systems Systems
Audio
Video
Data
Combinations
AudioAudio
Broadcast Radio
Two-way Radio
Audio Teleconferencing
VideoVideo
Broadcast Television
Slow-Scan TV
Two-Way Videoconferencing
DataData
Computer-Mediated Communication– Asynchronous (E-mail)– Synchronous (Chat Mode)
Computer Conferencing
Computer-Supported Collaborative Work
Required Data Comm. Required Data Comm. EquipmentEquipment
Computer
Modem(modulator - demodulator)
Terminal Emulation Software
Phone Line
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)
(continued)
Videotex– Prodigy, U.S. Videotel– two-way interactive retrievel of text and graphics
Audiographics– text, sound and graphics via computer workstation– electronic blackboard
TeleconferencingTeleconferencing
Audio
Video– includes audio
Distance EducationDistance Education
Distance Learning
Distance Teaching
Distance Education Delivery Distance Education Delivery SystemsSystems
LIFT Model– Live, Interactive, Facilitated TV
– Satellite Based
– TI-IN(continued)
(continued)
Modem Courses– Submit homework via Email– TCJC
Two-Way Audio/Video– video teleconference– UNT PDC, VTEL
Computer NetworksComputer Networks
Cluster – less than 30 machines– near to each other
LAN– local area network– less than 9 miles
(continued)
(continued)
MAN– metropolitan area network– less than 50 miles
WAN– wide area network– greater than 50 miles
InternetInternet
Network of networks
All use TCP/IP protocols
(continued)
(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.
Simple Curricular Enhancements Simple Curricular Enhancements via Emailvia Email
NGS Kids Network
ATT Learning Network
TERC’s Global Lab
TCET’s Air/Water Project
The End