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Communication & network devices
 

Communication & network devices

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    Communication & network devices Communication & network devices Presentation Transcript

    • COMMUNICATION AND NETWORK DEVICES
    • COMMUNICATIONSin computers, describes a process in which one computer transfer data, instructions, and information to another computer.
    • COMMUNICATIONS REQUIRES:1. SENDING DEVICE – a device thatinitiates the transfer.2. COMMUNICATION CHANNEL – provides the pathway over which the message can travel from source to destination.
    • COMMUNICATIONS REQUIRES:3. RECEIVING DEVICE – a device thataccept the sent material.
    • USES OF COMPUTER COMMUNICATIONSE-MAIL (ELECTRONICMAIL) – the exchange of textmessages andcomputer files via acommunicationsnetwork.
    • USES OF COMPUTER COMMUNICATIONSVOICE MAIL– an answeringmachine but convertsan analog voicemessage into digitalform.
    • USES OF COMPUTER COMMUNICATIONSFAX (facsimile)machine- sends and receivesdocuments viatelephone lines
    • USES OF COMPUTER COMMUNICATIONSTELECOMMUTING– allows employees towork away from thestandard workplace andcommunicate usingsome communicationstechnology.
    • USES OF COMPUTER COMMUNICATIONSVIDEOCONFERENCING– involves using video andcomputer technology toconduct a meeting betweenparticipants at two or moregeographically separatelocations.
    • USES OF COMPUTER COMMUNICATIONSGROUPWARE- is a softwareapplication that helpspeople work togetherand share informationover a network.
    • USES OF COMPUTER COMMUNICATIONSBBS (BULLETINBOARD SYSTEM)- a computer thatmaintains a centralizedcollection of electronicmessages.
    • USES OF COMPUTER COMMUNICATIONSGPS (GLOBALPOSITIONINGSYSTEM)– consist of earth based• receivers that analyze satellite signals to determine the receiver’s geographic location.
    • USES OF COMPUTER COMMUNICATIONSINTERNET – a worldwidecollection of networks.
    • COMMUNICATIONS CHANNELis the communications path between twodevices; this is composed of one or moretransmission media.
    • TRANSMISSION MEDIA• is consists of materials or techniques capable of carrying one or more signals, this is composed of – two types: • the physical • wireless transmission media
    • 2 TYPES OF TRANSMISSION MEDIA1. PHYSICAL TRANSMISSION MEDIA – use wire, cable, and other tangible materials to send communications signals, these include:
    • 2 TYPES OF TRANSMISSION MEDIAa) TWISTED PAIR CABLE - often used intelephone networks and LAN. b) COAXIAL CABLE – data travelsthrough the copper wire. c) FIBER-OPTIC CABLE – use light totransmit signals.
    • 2 TYPES OF TRANSMISSION MEDIA2. WIRELESS TRANSMISSION MEDIA -send communication signals through theair or space using radio, microwave andinfrared signals, these include:
    • 2 TYPES OF TRANSMISSION MEDIAa) BROADCAST RADIO - for radios/television.b) CELLULAR RADIO - for mobile communications/cellular telephones.c) MICROWAVES - radio waves that provide high speed signal transmission.
    • 2 TYPES OF TRANSMISSION MEDIA d) COMMUNICATIONS SATELLITE - aspace station hat receives microwavesignals from an earth based station. e) INFRARED – sends signal usinginfrared light waves.
    • TRANSMISSION CHARACTERISTICStransmission sent during communicationscategorized in these characteristics:1. SIGNAL TYPE A) analog B) digital C) broadband D) baseband
    • TRANSMISSION CHARACTERISTICS2. TRANSMISSION MODES A) asynchronous transmission B) synchronous transmission
    • TRANSMISSION CHARACTERISTICS3. TRANSMISSION DIRECTION A) simplex transmission B) half-duplex transmission C) full duplex transmission
    • TRANSMISSION CHARACTERISTICS4. TRANSFER RATES A) Bandwidths – range of frequencies that a transmission can carry.
    • TELEPHONE NETWORKthe public switched telephone network (PSTN) isthe worldwide telephone system that handlesvoice communication and also an integral part ofdata communications, sending data via thetelephone network travel over a variety oftransmission media and can be sent using dial-up lines or dedicated lines.
    • TELEPHONE NETWORK
    • TELEPHONE NETWORKDIAL-UP LINES - dial-up line is atemporary connectionthat uses one or moreanalog telephone linesfor communications.
    • TELEPHONE NETWORKDEDICATED LINES– connections that alwaysestablished between twocommunications devices, itprovides constant connection.Businesses can buy or leaseddedicated line from telephone orcommunications ServiceCompany.
    • 4 POPULAR TYPES OF DIGITAL LEASED LINES1. ISDN (Integrated Services DigitalNetwork) LINES– is a set of communication standards forsimultaneous digital transmission of voice, video,data, and other network services over thetraditional circuits of the public switchedtelephone network.
    • 4 POPULAR TYPES OF DIGITAL LEASED LINES1. ISDN (Integrated Services DigitalNetwork) LINES
    • 4 POPULAR TYPES OF DIGITAL LEASED LINES 2. DIGITAL SUBSCRIBER LINES(DSL)- uses broadband to transmit a greater number ofbytes on a standard twisted-pair cable. o Some of the DSL installations can provide a dial tone so you can use the line for both voice and data.
    • 4 POPULAR TYPES OF DIGITAL LEASED LINES2. DIGITAL SUBSCRIBER LINES (DSL)
    • 4 POPULAR TYPES OF DIGITAL LEASED LINES3. T-CARRIER LINES- is any of several types of digital lines thatcarry multiple signals over a singlecommunications.
    • 4 POPULAR TYPES OF DIGITAL LEASED LINES3. T-CARRIER LINES
    • 4 POPULAR TYPES OF DIGITAL LEASED LINES4. ASYNCHRONOUS TRANSFER MODE (ATM)- is a service designed to carry voice, data,video, and multimedia at high speeds -currently up to 622 Mbps.
    • 4 POPULAR TYPES OF DIGITAL LEASED LINES4. ASYNCHRONOUS TRANSFER MODE (ATM)
    • COMMUNICATIONS SOFTWARE- that makes it possible to send and receive data over telephone lines through modems. - that manage the transmission of data, instruction, and information between computers. - helps users establish a connection to another computer or network. - provide an interface for users to communicate with one another.
    • COMMUNICATIONS SOFTWARE
    • COMMUNICATIONS DEVICESis any type of hardware capable oftransmitting data, instructions, andinformation between a sending device anda receiving device.
    • COMMUNICATIONS DEVICES
    • COMMON TYPES OF COMMUNICATION DEVICEMODEM- device that perform conversion in digital signals and analog signals, it can be internal or external. - Both the sending and receiving ends of a communications channel must have a modem for data transmission to occur.
    • COMMON TYPES OF COMMUNICATION DEVICEMODEM
    • COMMON TYPES OF COMMUNICATION DEVICECABLE MODEM– a modem that sends and receives dataover the cable television (CATV) network,which consist largely of coaxial cable.
    • COMMON TYPES OF COMMUNICATION DEVICECABLE MODEM
    • COMMON TYPES OF COMMUNICATION DEVICEMULTIPLEXER (MUX)– a device that combines two or more inputsignals from various devices into a singlestream of data and then transmits it over asingle transmission medium.
    • COMMON TYPES OF COMMUNICATION DEVICEMULTIPLEXER (MUX)
    • COMMON TYPES OF COMMUNICATION DEVICE• NETWORK INTERFACE CARD (NIC)– an expansion card that you insert into anexpansion slot of a personal computer orother device, such as a printer, enabling thedevice to connect to a network.
    • COMMON TYPES OF COMMUNICATION DEVICE• NETWORK INTERFACE CARD (NIC)
    • CONNECTING NETWORKSthousands of computer networks exist fromsmall networks to global networks, tointerconnect the many types of networksthere are many various types ofcommunications devices including these:
    • CONNECTING NETWORKSHUB– also called concentrator or multistationaccess unit (MAU), provides a central pointfor cables in a network, usually containports for eight to twelve computers andother devices.
    • CONNECTING NETWORKSHUB
    • CONNECTING NETWORKSREPEATER– a device that accepts a signal from atransmission medium, amplifies it, andremits it over the medium.
    • CONNECTING NETWORKSREPEATER
    • CONNECTING NETWORKSBRIDGE– a device that connects two LANs usingthe same protocol such as Ethernet.
    • CONNECTING NETWORKSBRIDGE
    • CONNECTING NETWORKSGATEWAY – combination of hardware and softwarethat connects network that use differentprotocols.
    • CONNECTING NETWORKSGATEWAY
    • CONNECTING NETWORKSROUTER– a device that connects multiple networksincluding those with different protocols.
    • CONNECTING NETWORKSROUTER
    • NETWORKcollection of computers and devicesconnected by communicationschannels that allows users to sharedata, information hardware, andsoftware with other users.
    • NETWORK
    • TYPES OF NETWORKS LOCAL AREA NETWORK (LAN) – is a network that connects computers and devices in a limited geographical area.
    • TYPES OF NETWORKS WIRELESS LAN (WLAN) – is a LAN that uses no physical wires.
    • TYPES OF NETWORKS METROPOLITAN AREA NETWORK (MAN) – connects LANS in metropolitan area.
    • TYPES OF NETWORKS WIDE AREA NETWORK (WAN) – is a network that covers a large geographical area.
    • NETWORK TOPOLOGY ORNETWORK ARCHITECTUREthe configuration or physical arrangementof the device in a communication network.
    • 3 COMMONLY USED NETWORK TOPOLOGIES 1. BUS NETWORK– node must be intelligent enough to listento the bus.
    • 3 COMMONLY USED NETWORK TOPOLOGIES2. RING NETWORK– each node has an equal amount ofintelligence.
    • 3 COMMONLY USED NETWORK TOPOLOGIES3. STAR NETWORK– all nodes are joined at single central pointusing one link for each node.
    • PROTOCOLis a set of rules and procedures forexchanging information among computers.
    • PROTOCOLETHERNET- is a LAN protocol thatallows personalcomputers to contendfor access to a network.
    • PROTOCOLTOKEN RING- is protocol that controlaccess to a network byrequiring that a specialsignal called a token isshared or passedamong network devices.
    • PROTOCOLTCP/IP (TRANSMISSIONCONTROLPROTOCOL/INTERNETPROTOCOL)- is a set of protocolsused to manage datatransmission bybreaking it up intopackets.
    • INTRANETSare internal networks that use Internet andWeb technologies, it makes companyinformation accessible to employees tofacilitate working in groups.
    • INTRANETS
    • EXTRANETis an intranet that extends to authorize usersoutside the company.