Telecommunication and networks


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Information systems: Telecommunications, the Internet, and Wireless Technology

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  • Telecommunication and networks

    1. 1. Telecommunications, the Internet, and Wireless Technology Sergio León Bedoya Information Systems Course UIBS
    2. 2. Components and functions of a Telecommunications System • Transmit information • Establish interface between sender and the receiver • Route messages along most efficient paths • Perform elementary processing of information • Perform editorial tasks on data • Convert message speed or format • Control flow of information
    3. 3. Analog Signal • Continuous waveform • Passes through communications medium • Used for video, audio and voice communications Digital signal • Discrete waveform • Transmits data coded into two discrete states as 1-bits and 0-bits • Used for data communications
    4. 4. Communication channels Wired transmission • Twisted wire: Telephone systems • Coaxial cable: Cable television • Fiber optics and optical networks: Dense wave division multiplexing (DWDM) Wireless transmission: • Microwave, Satellites, Paging systems, Cellular telephones, Personal communication Services, Personal digital assistants, Mobile data networks Proprieties Transmission speed: Baud, bandwidth
    5. 5. Star network : All computers and others devices are connected to a central host computer Bus Network: Links a number of computers by a single circuit Ring Network: All computers are linked by a closed loop Communication Networks Topologies
    6. 6. Local Area Networks • Require their own dedicated channels • Encompass a limited distance • Gateway, router, Network Operating System (NOS), peer-to-peer Wireless LANs-WLAN • Wi-Fi (IEEE 802.11b) standard: Up to 11 Mbps, low cost, high-speed mobile Internet access, links work groups • Bluetooth standard: Up to 720 Kbps, small personal area networks • Span large geographical distance • Consist of variety of cable, satellite, and microwave technologies • Switched lines, dedicated lines Local Area Networks (LANs) and Wide Area Networks (WANs)
    7. 7. Electronic Commerce Electronic Business Technologies. • E-mail: eliminates telephone tag and costly long distance telephone charges • Groupware: Enables work groups at different locations to participate in discussion forums and work on shared documents and projects • Teleconferencing: ability to confer with a group of people simultaneously • Data conferencing: Two or more users can edit and modify data files simultaneously • Videoconferencing: Participants are able to see each other over video screens • E-learning: Instruction delivered online using the Internet or private networks
    8. 8. THE NEW INFORMATION TECHNOLOGY (IT) INFRASTRUCTURE Standards and Connectivity for Digital Integration • Open systems Interconnect OSI : determines a multiple-layer layout to interconnect different equipment. • TCP/IP model: it is based on OSI layers but it’s focused on the transmission. It’s a short practical model, not so theoretical than OSI.
    9. 9. What Is Internet? Internet Service Provider (ISP) • Commercial organization with a permanent connection to Internet • Sells temporary connections to subscribers "The World Wide Web (WWW, or simply Web) is an information space in Which the items of interest, Referred to as resources, are Identified by the global identifiers called Uniform Resource Identifiers (URI).“ Main Features • Based on a standard hypertext language called Hypertext markup language (HTML) • Combines text, hypermedia, graphics, and sound • Handles all types of digital communication • You use graphical user interfaces for easy viewing Firewall :Hardware or software Placed Between an organization's internal network and external network and Prevents outsiders from invading private networks Extranets: Private intranets extended to Authorized users outside company
    10. 10. Web Content Management Tool A content management system (CMS) is a system providing a collection of Procedures used to manage work flow in a collaborative environment. These Procedures can be manually or computer-based. The Procedures are designed to do the Following: • Allow for a large number of people to Contribute to and share stored data • Control access to data, based on user roles (defining Which information users or user groups can view, etc.). • Aid in easy storage and retrieval of data • Reduce repetitive duplicate input • Improve the ease of report writing • Improve Communication between users The Challenge of the New Information Technology Infrastructure • Loss of management control • Connectivity and application integration challenges • Organizational change requirements • Hidden costs of enterprise computing • Scalability, reliability, and security downtime