TELECOMMUNICATIONS AND NETWORKS ~ Pertemuan 8 ~ Oleh: Ir. Abdul Hayat, MTI.
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Transcript of TELECOMMUNICATIONS AND NETWORKS ~ Pertemuan 8 ~ Oleh: Ir. Abdul Hayat, MTI.
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TELECOMMUNICATIONS AND NETWORKS
~ Pertemuan 8 ~Oleh:
Ir. Abdul Hayat, MTI
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OBJECTIVES
• What technologies are used in telecommunications system?
• What telecommunications transmission media should our organization use?
• How should our organization design its networks?
• What telecommunications applications can be used for e-commerce and e-business?
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MANAGEMENT CHALLENGES
• Managing LAN• Managing bandwidth
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TELECOMMUNICATIONS: COMPONENTS AND FUNCTION
• Communication of information by electronic means
• Includes digital data transmission as well as voice transmission
• Components:– Computers to process information– Terminals or any input/output devices that send or
receive data– Communication processors– Communications software
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COMPONENTS OF A TELECOMMUNICATIONS SYSTEM
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FUNCTIONS OF TELECOMMUNICATION 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
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TYPES OF SIGNALS
• Analog Signal– Continuous waveform– Passes through communication medium– Used for voice communications
• Digital Signal– Discrete waveform– Transmits data coded into two discrete states as 1
and 0
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MODEM
• Translates computer’s digital signals into analog and vice versa
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COMMUNICATION CHANNELS
• Twisted wire: telephone systems• Coaxial cable: cable television• Fiber optic and optical network: dense wave
division multiplexing (DWDM)• Wireless transmission: microwave, satellites,
paging systems, cellular telephone, personal digital assistants, mobile data networks
• Transmission speed: baud, bandwidth
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COMMUNICATIONS PROCESSORS & SOFTWARES
• Front-end Processor: manages communications for the host computer
• Concentrator: collects and temporarily stores messages
• Controller: supervise communication traffic• Multiplexer: enables single communication
channel to carry data transmissions
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NETWORK TOPOLOGIES
• Star Network– All computers and other 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
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STAR NETWORK
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BUS NETWORK
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RING NETWORK
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LOCAL AREA NETWORK
• Require their own dedicated channels• Encompass a limited distance• Gateway, router, Network Operating System
(NOS), peer-to-peer
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EXAMPLE: LAN
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WIRELESS LAN
• 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
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WIDE AREA NETWORK
• Span large geographical distance• Consist of variety of cable, satellite, and
microwave technologies• Switched lines, dedicated lines
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NETWORK CONVERGENCE
• Converged network– Enables voice, video and data to run over a single
network• Unified messaging– System combining voice messages, email, and fax
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E-COMMERCE/E-BUSINESS TECHNOLOGIES
• Electronic mail and groupware• Voice mail and fax• Teleconferencing, data conferencing, and
video conferencing• Distance learning and e-Learning
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ELECTRONIC MAIL AND GROUPWARE
• 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
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VOICE MAIL AND FAX
• Voice mail– Digitizes spoken message and transmits it over a
network• Fax– Digitizes and transmits documents over telephone
lines
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TELECONFERENCING, DATA AND VIDEO CONFERENCING
• Teleconferencing– Ability to confer with a group of people
simultaneously• Data conferencing– Two or more users can edit and modify data files
simultaneously • Video conferencing– Participants are able to see each other over video
screens
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DISTANCE LEARNING AND E-LEARNING
• Distance learning– Education or training delivered over a distance to
individuals in one or more locations• E-Learning– Instruction delivered online using the internet or
private networks
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ELECTRONIC DATA INTERCHANGE
• Direct computer-to-computer exchange between two organizations of standard business transaction documents