Educational Educational TelecommunicationsTelecommunications

by Gerald Knezek

Professor of Technology & CognitionUniversity 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

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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

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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

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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

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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