Educational Telecommunications by Gerald Knezek Professor of Technology & Cognition University of North Texas

Telecommunications l Tele - at a distance l Communications - exchange of information

Telecommunications l Communications over distance or time

Modes of Communication l Simplex – broadcast radio, TV l Half Duplex – speakerphone l Full Duplex – telephone

Types of Telecommunication Systems l Audio l Video l Data l Combinations

Audio l Broadcast Radio l Two-way Radio l Audio Teleconferencing

Video l Broadcast Television l Slow-Scan TV l Two-Way Videoconferencing

Data l Computer-Mediated Communication – Asynchronous ( ) – Synchronous (Chat Mode) l Computer Conferencing l Computer-Supported Collaborative Work

Required Data Comm. Equipment l Computer l Modem (modulator - demodulator) l Terminal Emulation Software l Phone Line

Combination Data/Graphics Systems l Information Retrieval Services – interactive access to (primarily) text – Source, Compuserve, Dow Jones l Teletext – one-way text and graphics; Prestel (UK) – stock market quotations – severe weather alert (continued)

l Videotex – Prodigy, U.S. Videotel – two-way interactive retrievel of text and graphics l Audiographics – text, sound and graphics via computer workstation – electronic blackboard

Teleconferencing l Audio l Video – includes audio

Distance Education l Distance Learning l Distance Teaching

Distance Education Delivery Systems l LIFT Model – Live, Interactive, Facilitated TV – Satellite Based – TI-IN (continued)

l Modem Courses – Submit homework via – TCJC l Two-Way Audio/Video – video teleconference – UNT PDC, VTEL

Computer Networks l Cluster – less than 30 machines – near to each other l LAN – local area network – less than 9 miles (continued)

l MAN – metropolitan area network – less than 50 miles l WAN – wide area network – greater than 50 miles

Internet l Network of networks l All use TCP/IP protocols (continued)

l Support basic services – (SMTP) – Telnet – FTP l Supports numerous servers and clients – JOVE Unix system at UNT, Tenet in Austin – Listservs – Gopher, WWW, etc.

Simple Curricular Enhancements via l NGS Kids Network l ATT Learning Network l TERC’s Global Lab l TCET’s Air/Water Project

The End