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Telecommunications and networks
- 1. Telecommunications and Networks Summary of Chapter 3
- 2. Functions of Telecommunicaton Systems • Transmit Information at a distance between people and structures • Make the communications as efficient as possible • Edit data • Control the flow of information • Packed switching nodes Agregar un pie de página 2
- 3. FR Type of Signals A n alog S ig n al • Continuous waveform • Passes through communication medium • Used mostly for video, audio and voice communications • Represents physical measurements Agregar un pie de página 3
- 4. FR Type of Signals Dig ital S ig n al • Discrete waveform • Used for data communications • Limited number of defined values such as 1 and 0 • Transition between values is instantaneous • Represented by square waves Agregar un pie de página 4
- 5. FR Communication Channels Wireless transmission • Twisted wire • Telephone systems • Coaxial cable • Cable television • Fiber optics • Dense wave division multiplexing Wireless Transmission • Microwaves • Satellites • Cellular telephones • Mobile data networks • Personal digital assistants Agregar un pie de página 5
- 6. FRCommunications Processors and Software • Front-end processor • Manages communications for the host computer • Concentrator • Collects and temporarily stores messages • Controller • Supervises communication traffic • Multiplexer • Enables single communication channels to carry data transmissions Agregue un pie de página 6
- 7. FR Agregue un pie de página 7 Communications Networks • Network topologies • Star network • Bus network • Ring network • Local area network (LAN) • Require own channels • Limited Distance • Wide area network • Large distance • Switched lines and dedicated lines
- 8. FR Agregue un pie de página 8 Electronic Commerce & Electronic Business Technologies • Email • Removes telephone tag and costly long-distance telephone charges • Groupware • Enables work groups at different locations to join discussions forums and participate in shared documents • Voice mail • Digitizes spoke message and transmits it over a network • Fax • Digitalizes and transmits documents over telephone lines
- 9. FR Agregue un pie de página 9 Electronic Data Interchange (EDI) • The direct computer-to-computer exchange between two organizations of standard business transaction documents
- 10. FR Agregue un pie de página 10 Packed-Switched Networks and Communications