1. Copyright 2001, S.D. Personick. All rights reserved1 Telecommunications Networking I Topic 1 Overview of Telecommunications Networking I-II Dr. Stewart D. Personick Drexel University

2. Copyright 2001, S.D. Personick. All rights reserved2 Telecommunications Networking Sending and receiving messages (couriers, smoke signals, flashes of light, telegraph, teletype, facsimile, voice mail, text E-mail, multimedia E-mail) Real-time conversations and collaborative work (face-to-face, wireline telephone, 2-way radio-telephone, video teleconferencing, multimedia teleconferencing) Accessing stored or real-time information (physical file cabinets and folders, FTP, WWW, remote sensing, imagery) Networked information systems (mission- oriented teams, telnet, client-server, peer-to- peer, distributed computing environments, sensor-to-shooter)

3. Copyright 2001, S.D. Personick. All rights reserved3 Telecommunications Networking How to communicate in efficient, predictable, reliable, and useful ways? -Representing data or information as a “signal” -Defining the quality (or fidelity) of reception/communication -Signals in the presence of noise, distortion and interference -Point-to-point communication systems -Switched networks (e.g., the Internet, LANs, wireless networks…)

4. Copyright 2001, S.D. Personick. All rights reserved4 Overview of Telecommunications Networking I Overview of telecommunications Networking I-II Data, information (voice, audio, images, video), and signals that represent data and information Signals in noise, measures of quality of communication Wire-pair and coaxial cable, optical fiber, and wireless transmission systems (link layer) -radio frequency wireless links -lasercom (free-space optical) wireless links Circuit switching and circuit-switched telecommunications networks

5. Copyright 2001, S.D. Personick. All rights reserved5 Overview of Telecommunications Networking II Wireless systems and networks: peer-to-peer communication using a shared “ether”, broadcast systems, cellular/ PCS, 2-way satellite systems Local area networks (packet switching) The Internet Next generation systems, networks, issues and applications