9. telecommunications 9.1. information system informationsystem businesschallenge businesssolutions...
TRANSCRIPT
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9. TELECOMMUNICATIO
NS
9. TELECOMMUNICATIO
NS
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INFORMATION SYSTEMINFORMATION SYSTEMINFORMATION SYSTEMINFORMATION SYSTEM
INFORMATION INFORMATION
SYSTEMSYSTEM
BUSINESS BUSINESS
CHALLENGECHALLENGE
BUSINESS BUSINESS
SOLUTIONSSOLUTIONS
MANAGEMENTMANAGEMENT
INFORMATIONINFORMATION
TECHNOLOGYTECHNOLOGY
ORGANIZATIONORGANIZATION
9.2
SELECTING A SELECTING A TELECOMMUNICATIONS PLATFORMTELECOMMUNICATIONS PLATFORM
MANAGING LOCAL AREA MANAGING LOCAL AREA NETWORKSNETWORKS
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TELECOMMUNICATIONSTELECOMMUNICATIONS
• COMMUNICATING INFORMATIONCOMMUNICATING INFORMATION
• VIA ELECTRONIC MEANSVIA ELECTRONIC MEANS
• OVER SOME DISTANCEOVER SOME DISTANCE
**
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INFORMATION SUPERHIGHWAYINFORMATION SUPERHIGHWAY
• NATIONAL / WORLDWIDENATIONAL / WORLDWIDE
• HIGH SPEEDHIGH SPEED
• DIGITAL TELECOMMUNICATIONSDIGITAL TELECOMMUNICATIONS
• ACCESSIBLE BY GENERAL PUBLICACCESSIBLE BY GENERAL PUBLIC
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APPLICATIONAPPLICATION EXAMPLEEXAMPLE REQUIREMENTREQUIREMENT
ONLINE DATA ENTRY INVENTORY CONTROL DIRECT RESPONSE REQUIRED
ON-LINE TEXT RETRIEVAL HOSPITAL INFO SYSTEM HIGH VOLUME REAL TIME RESPONSE
LIBRARY SYSTEMS
INQUIRY / RESPONSE POINT-OF SALES RESPONSE WITHIN SECONDS
AIRLINE RESERVATIONS
CREDIT CHECKING
ADMINISTRATIVE MESSAGES ELECTRONIC MAIL SHORT RESPONSE / DELIVERY TIMES
PROCESS CONTROL COMPUTER AIDED MANUFACTURING : NUMERIC MACHINE CONTROL
CONTINUOUS INPUT / ONLINE RESPONSES
INTERCOMPUTER DATA EXCHANGE
ELECTRONIC FUNDS TRANSFER BURST TRANSFER OF LARGE DATA
BLOCKS ON-LINE IMMEDIATE RESPONSE
COMMON BUSINESS TASKS REQUIRING TELECOMMUNICATIONS
COMMON BUSINESS TASKS REQUIRING TELECOMMUNICATIONS
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SYSTEM COMPONENTSSYSTEM COMPONENTS
SYSTEMSYSTEMSYSTEM
INPUT OUTPUTPROCESS
FEEDBACK
• COMPUTERSCOMPUTERS• TERMINALS (Input / Output Devices)TERMINALS (Input / Output Devices)• COMMUNICATIONS CHANNELSCOMMUNICATIONS CHANNELS• PROCESSORS (Modems; Multiplexers; PROCESSORS (Modems; Multiplexers;
Front-end Processors)Front-end Processors)• NETWORK SOFTWARENETWORK SOFTWARE
**
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PROTOCOLPROTOCOL
RULES & PROCEDURESRULES & PROCEDURES
TO GOVERN TRANSMISSIONTO GOVERN TRANSMISSION
BETWEEN COMPONENTS BETWEEN COMPONENTS
IN A NETWORKIN A NETWORK
**
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ANALOG SIGNALANALOG SIGNAL
• CONTINUOUS WAVEFORMCONTINUOUS WAVEFORM
• PASSES THRU SYSTEMPASSES THRU SYSTEM
• VOICE COMMUNICATIONSVOICE COMMUNICATIONS
**
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DIGITAL SIGNALDIGITAL SIGNAL
• DISCRETE WAVEFORMDISCRETE WAVEFORM
• TWO DISCRETE STATES:TWO DISCRETE STATES:– 1-BIT & 0-BIT1-BIT & 0-BIT– ON / OFF PULSEON / OFF PULSE
• DATA COMMUNICATIONDATA COMMUNICATION
**
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COMMUNICATION CHANNELSCOMMUNICATION CHANNELS
MEANS BY WHICH DATA ARE MEANS BY WHICH DATA ARE TRANSMITTED:TRANSMITTED:
• TWISTED PAIR (Copper Wires)TWISTED PAIR (Copper Wires)
• COAXIAL CABLE: (Insulated Copper COAXIAL CABLE: (Insulated Copper Wires)Wires)
• FIBER-OPTIC CABLEFIBER-OPTIC CABLE
• WIRELESSWIRELESS
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FIBER OPTICSFIBER OPTICS
• SUPER CLEAR GLASS STRANDSSUPER CLEAR GLASS STRANDS
• OVER 4 MILLION MILES IN U.S.OVER 4 MILLION MILES IN U.S.
• NATION-WIDE BY 2015NATION-WIDE BY 2015
• UP TO TEN BILLION BITS PER UP TO TEN BILLION BITS PER SECONDSECOND
• FULL DUPLEXFULL DUPLEX
**SIGNALSIGNAL LASERLASER CABLECABLE PHOTOPHOTO
DETECTORDETECTOR SIGNALSIGNAL
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WIRELESS TRANSMISSION (Megahertz)
WIRELESS TRANSMISSION (Megahertz)
• 101055 - 10 - 1088: AM Radio; Short Wave; FM; VHF-: AM Radio; Short Wave; FM; VHF-TVTV
• 101088 - 10 - 101010: UHF-TV, Cellular Phones, RAM : UHF-TV, Cellular Phones, RAM Mobile, Data, Cordless Phone, Paging, Mobile, Data, Cordless Phone, Paging, Narrow Band PCS, IndustrialNarrow Band PCS, Industrial
• 10101010 - 10 - 101212: Radar, Microwave: Radar, Microwave• 10101313 - 10 - 101414: Infra Red, Remote Control, : Infra Red, Remote Control,
WirelessWireless
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WIRELESS TRANSMISSION (Megahertz)
WIRELESS TRANSMISSION (Megahertz)
• 10101515 - 10 - 101616: Visible Light; Fiber Optics: Visible Light; Fiber Optics
• 10101818 - 10 - 102222: X-Ray, Gamma, Cosmic, : X-Ray, Gamma, Cosmic, Personal Communication Services Personal Communication Services (PCS)(PCS)
**
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LOW-ORBIT SATELLITELOW-ORBIT SATELLITE
UPLINKUPLINK
MICROWAVE MICROWAVE TRANSMISSIONTRANSMISSION
DOWNLINKDOWNLINK
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WIRELESS TRANSMISSION TECHNOLOGIES
WIRELESS TRANSMISSION TECHNOLOGIES
• PAGING SYSTEM: Small Page Beeps PAGING SYSTEM: Small Page Beeps when Receives Short Messagewhen Receives Short Message
• CELLULAR TELEPHONE: Device uses CELLULAR TELEPHONE: Device uses Radio Waves to Reach Antennas Within Radio Waves to Reach Antennas Within Areas Called CellsAreas Called Cells
• MOBILE DATA NETWORKS: Radio - MOBILE DATA NETWORKS: Radio - based Data Network using Hand-held based Data Network using Hand-held Computers. Cheap, EfficientComputers. Cheap, Efficient
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WIRELESS TRANSMISSION TECHNOLOGIES
WIRELESS TRANSMISSION TECHNOLOGIES
• PERSONAL COMMUNICATION PERSONAL COMMUNICATION SERVICE: Cellular; Lower Power; SERVICE: Cellular; Lower Power; Higher Frequency. Smaller Phones Higher Frequency. Smaller Phones not Shielded by Buildings, Tunnelsnot Shielded by Buildings, Tunnels
• PERSONAL DIGITAL ASSISTANT: PERSONAL DIGITAL ASSISTANT: Pen Sized, Hand-held, Digital Pen Sized, Hand-held, Digital CommunicatorCommunicator
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COMMUNICATIONS CHANNELSCOMMUNICATIONS CHANNELS
• TRANSMISSION SPEED: Bits per TRANSMISSION SPEED: Bits per Second (BPS) or BaudSecond (BPS) or Baud
• BANDWIDTH: Capacity of Channel; BANDWIDTH: Capacity of Channel; Difference between Highest & Difference between Highest & Lowest FrequenciesLowest Frequencies
**
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SPEEDS & COST OF MEDIASPEEDS & COST OF MEDIA MEDIUMMEDIUM SPEEDSPEED COSTCOST TWISTED PAIRTWISTED PAIR 300 BPS - 10 MBPS300 BPS - 10 MBPS LOWLOW
MICROWAVEMICROWAVE 256 KBPS - 100 MBPS256 KBPS - 100 MBPS
SATELLITESATELLITE 256 KBPS - 100 MBPS256 KBPS - 100 MBPS
COAXIAL CABLECOAXIAL CABLE 56 KBPS - 200 MBPS56 KBPS - 200 MBPS
FIBER OPTICSFIBER OPTICS 56 KBPS - 10 GBPS56 KBPS - 10 GBPS HIGHHIGH BPS: BITS PER SECONDBPS: BITS PER SECOND KBPS: KILOBITS PER SECONDKBPS: KILOBITS PER SECOND MBPS: MEGABITS PER SECONDMBPS: MEGABITS PER SECOND GBPS: GIGABITS PER SECONDGBPS: GIGABITS PER SECOND9.18
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TRANSMISSION MODESTRANSMISSION MODES
• ASYNCHRONOUS: One Character at ASYNCHRONOUS: One Character at a Time; Start, Stop, Parity Bits; Low a Time; Start, Stop, Parity Bits; Low SpeedSpeed
• SYNCHRONOUS: Timing Circuitry SYNCHRONOUS: Timing Circuitry determines Start & End of Block determines Start & End of Block Transmission; High SpeedTransmission; High Speed
**
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TRANSMISSION DIRECTIONTRANSMISSION DIRECTION
• SIMPLEX: One Direction OnlySIMPLEX: One Direction Only
• HALF-DUPLEX: Can Flow Both HALF-DUPLEX: Can Flow Both Ways; Only One Direction at a TimeWays; Only One Direction at a Time
• FULL-DUPLEX: Both Directions FULL-DUPLEX: Both Directions SimultaneouslySimultaneously
**
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COMMUNICATIONS PROCESSORSCOMMUNICATIONS PROCESSORS• FRONT- END PROCESSOR: Minicomputer FRONT- END PROCESSOR: Minicomputer
Manages Communication for Host ComputerManages Communication for Host Computer• CONCENTRATOR: Computer Collects CONCENTRATOR: Computer Collects
Messages for Batch Transmission to Host Messages for Batch Transmission to Host ComputerComputer
• CONTROLLER: Computer Controls Interface CONTROLLER: Computer Controls Interface between CPU and Peripheral Devicesbetween CPU and Peripheral Devices
• MULTIPLEXER: Allows Channel to Carry MULTIPLEXER: Allows Channel to Carry Multiple Sources SimultaneouslyMultiple Sources Simultaneously
**
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NETWORK TOPOLOGIESNETWORK TOPOLOGIES
HOSTHOST
USERUSER
USERUSER
USERUSER USERUSER
STARSTAR
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NETWORK TOPOLOGIESNETWORK TOPOLOGIES
BUSBUS
USERUSER
USERUSER
USERUSER
USERUSER
USERUSER
USERUSER
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NETWORK TOPOLOGIESNETWORK TOPOLOGIES
USERUSER
USERUSER
USERUSER
USERUSER
RINGRING
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LOCAL NETWORKSLOCAL NETWORKS
• PRIVATE BRANCH EXCHANGE (PBX): PRIVATE BRANCH EXCHANGE (PBX): Firm’s Central Switching SystemFirm’s Central Switching System
• LOCAL AREA NETWORK (LAN): Dedicated LOCAL AREA NETWORK (LAN): Dedicated Channels; Limited Distance (less than Channels; Limited Distance (less than 2000 foot radius); Higher Capacity than 2000 foot radius); Higher Capacity than PBX. Can Share Expensive Hardware & PBX. Can Share Expensive Hardware & SoftwareSoftware
**
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LOCAL AREA NETWORKLOCAL AREA NETWORK
• FILE SERVER: Stores Programs, FILE SERVER: Stores Programs, Data; Determines Access to NetworkData; Determines Access to Network
• NETWORK OPERATING SYSTEM: NETWORK OPERATING SYSTEM: Manages File Server; Routes Manages File Server; Routes Communications on NetworkCommunications on Network
• GATEWAY: Connection to Other GATEWAY: Connection to Other NetworksNetworks
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LOCAL AREA NETWORKLOCAL AREA NETWORK
• BASEBAND: Provides Single Path BASEBAND: Provides Single Path for Transmitting either Text, for Transmitting either Text, Graphics, Voice, or Video at One Graphics, Voice, or Video at One TimeTime
• BROADBAND: Provides Several BROADBAND: Provides Several Paths for Transmitting Several Types Paths for Transmitting Several Types of Data Simultaneouslyof Data Simultaneously
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WIDE - AREA NETWORKWIDE - AREA NETWORK• NETWORK SPANS LARGE GEOGRAPHIC NETWORK SPANS LARGE GEOGRAPHIC
DISTANCESDISTANCES• CAN INCLUDE CABLE, SATELLITE, CAN INCLUDE CABLE, SATELLITE,
MICROWAVEMICROWAVE• SWITCHED LINES: Route Determined by SWITCHED LINES: Route Determined by
Current TrafficCurrent Traffic• DEDICATED LINES: Constantly Available DEDICATED LINES: Constantly Available
for High-Volume Trafficfor High-Volume Traffic
**
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VALUE-ADDED NETWORK (VAN)
VALUE-ADDED NETWORK (VAN)
• PRIVATE; MULTIPATH; DATA ONLYPRIVATE; MULTIPATH; DATA ONLY
• 3rd PARTY MANAGED3rd PARTY MANAGED
• USED BY SEVERAL ORGANIZATIONSUSED BY SEVERAL ORGANIZATIONS
• SUBSCRIPTION BASISSUBSCRIPTION BASIS
**
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PACKET SWITCHINGPACKET SWITCHING
• FORM OF VANFORM OF VAN
• BREAKS DATA BLOCKS INTO BREAKS DATA BLOCKS INTO SMALL PACKETS (e.g.: 128 Bytes)SMALL PACKETS (e.g.: 128 Bytes)
• PACKETS ROUTED BY MOST PACKETS ROUTED BY MOST ECONOMICAL MEANSECONOMICAL MEANS
• REASSEMBLED AT DESTINATIONREASSEMBLED AT DESTINATION
**
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ASYNCHRONOUS TRANSFER MODE (ATM)
ASYNCHRONOUS TRANSFER MODE (ATM)
• CELL: 53 Groups of 8 Bytes EachCELL: 53 Groups of 8 Bytes Each• USES FIBER OPTICS CABLEUSES FIBER OPTICS CABLE• INDEPENDENT OF VENDOR INDEPENDENT OF VENDOR
HARDWARE SPEEDSHARDWARE SPEEDS• CAN TIE LAN TO WANCAN TIE LAN TO WAN
**
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HOW ORGANIZATIONS USE TELECOMMUNICATIONS
HOW ORGANIZATIONS USE TELECOMMUNICATIONS
• FACILITATING APPLICATIONSFACILITATING APPLICATIONS
• ELECTRONIC DATA INTERCHANGEELECTRONIC DATA INTERCHANGE
• GROUPWAREGROUPWARE
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FACILITATING APPLICATIONSFACILITATING APPLICATIONS
• ELECTRONIC MAIL (e-mail)ELECTRONIC MAIL (e-mail)• VOICE MAILVOICE MAIL• FACSIMILE MACHINES (fax)FACSIMILE MACHINES (fax)• DIGITAL INFORMATION SERVICESDIGITAL INFORMATION SERVICES• TELECONFERENCINGTELECONFERENCING• DATACONFERENCINGDATACONFERENCING• VIDEOCONFERENCINGVIDEOCONFERENCING
**
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PROVIDERPROVIDER TYPE OF SERVICETYPE OF SERVICE
AMERICA ONLINE GENERAL INTEREST / BUSINESS INFORMATION
COMPUSERVE GENERAL INTEREST / BUSINESS INFORMATION
PRODIGY GENERAL INTEREST / BUSINESS INFORMATION
DOW JONES NEWS RETRIEVAL BUSINESS / FINANCIAL INFORMATION
QUOTRON FINANCIAL INFORMATION
DIALOG BUSINESS / SCIENTIFIC / TECHNICAL INFORMATION
LEXIS LEGAL RESEARCH
NEXIS NEWS / BUSINESS INFORMATION
DIGITAL INFORMATION SERVICESDIGITAL INFORMATION SERVICES
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• GROUP WRITING & COMMENTINGGROUP WRITING & COMMENTING
• ELECTRONIC MAIL DISTRIBUTIONELECTRONIC MAIL DISTRIBUTION
• SCHEDULING MEETINGSSCHEDULING MEETINGS
• SHARED FILES & DATABASESSHARED FILES & DATABASES
• SHARED TIME LINES & PLANSSHARED TIME LINES & PLANS
• ELECTRONIC MEETINGSELECTRONIC MEETINGS
**
GROUPWAREGROUPWARE
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MANAGEMENT ISSUES & DECISIONS
MANAGEMENT ISSUES & DECISIONS
TELECOMMUNICATIONS PLAN:TELECOMMUNICATIONS PLAN:• KNOW LONG-RANGE PLANSKNOW LONG-RANGE PLANS• AUDIT EXISTING CAPABILITIESAUDIT EXISTING CAPABILITIES• IDENTIFY, PRIORITIZE CRITICAL IDENTIFY, PRIORITIZE CRITICAL
IMPROVEMENTSIMPROVEMENTS• ENHANCE FIRM’S STRATEGIC POSITIONENHANCE FIRM’S STRATEGIC POSITION
IMPLEMENT PLANIMPLEMENT PLAN
**9.36
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IMPLEMENTATION FACTORSIMPLEMENTATION FACTORS• DISTANCEDISTANCE• RANGE OF SERVICESRANGE OF SERVICES• SECURITYSECURITY• MULTIPLE ACCESSMULTIPLE ACCESS• UTILIZATIONUTILIZATION• COSTCOST• INSTALLATIONINSTALLATION• CONNECTIVITYCONNECTIVITY
**
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9. TELECOMMUNICATIO
NS
9. TELECOMMUNICATIO
NS
9.38