Data Communications Networking Devices - 4th Ed.pdf

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356 _________________________________ WIDE AREA NETWORK TRANSMISSION EQUIPMENTFigure 4.4 Signal conversion performed by modems. A modem converts a digital signal toan analog tone modulation) and reconverts the analog tone demodulation) into its originaldigital signalpulses, originated by a computer or terminal, are converted into an analog, waveshapedsignal which can be transmitted over a telephone line. The receiver containsa demodulator and associated circuitry which reverse the process by converting theanalog telephone signal back into a series of digital pulses that is acceptable to thecomputer or terminal device. This signal conversion is illustrated in Figure 4.4.Basic componentsIn Figure 4.5 the basic components of a modem are indicated in a block diagramformat, with those components associated with the transmitter at the top portion ofthe illustration, while those components associated with the receiver are located inthe lower portion of the ®gure. Prior to examining each of the components, readersshould note that Figure 4.5 represents a `general' modem and those componentsindicated by dashed lines are only applicable to synchronous devices. In addition,other components, including a microprocessor, ROM and RAM, which can beincluded to provide a modem with intelligence have been purposely omitted fromFigure 4.5 to enable us to focus our attention upon the modulation and demodulationof data by the transmitter and receiver in each device.Modem transmitter sectionThe key components of a modem's transmitter section include a data encoder,scrambler, modulator, ampli®er, ®lter, timing source and transmit control circuits.Of these components, the scrambler and transmit clock provided by the timingsource are used only in synchronous modems.
4.2 MODEMS _____________________________________________________________________ 357Figure 4.5 Basic components of a modem
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Copyright # 1986, 1989, 1992, 1999
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CONTENTSPrefaceAcknowledgementsxxii
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CONTENTS __________________________
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CONTENTS __________________________
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xxiv ______________________________
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Data Communications Networking Devi
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1.2 LINE CONNECTIONS ______________
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1.3 TYPES OF SERVICES AND TRANSMISS
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1.4 TRANSMISSION MODE _____________
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1.4 TRANSMISSION MODE _____________
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1.5 TRANSMISSION TECHNIQUES _______
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1.5 TRANSMISSION TECHNIQUES _______
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1.7 LINE STRUCTURE ________________
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1.8 LINE DISCIPLINE _______________
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1.9 NETWORK TOPOLOGY ______________
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1.10 TRANSMISSION RATE ____________
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1.11 TRANSMISSION CODES ___________
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1.12 ERROR DETECTION AND CORRECTION
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1.13 STANDARDS ORGANIZATIONS, ACTIV
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1.14 THE PHYSICAL LAYER ___________
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1.15 THE DATA LINK LAYER __________
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1.16 INTEGRATED SERVICES DIGITAL NE
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REVIEW QUESTIONS __________________
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4.3 INTELLIGENT MODEMS ____________
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4.4 MULTIPORT MODEMS ______________
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4.5 MULTIPOINT MODEMS _____________
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4.6 SECURITY MODEMS _______________
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4.9 BROADBAND MODEMS ______________
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4.10 DIGITAL SERVICE UNITS ________
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4.11 CHANNEL SERVICE UNITS ________
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4.12 PARALLEL INTERFACE EXTENDERS _
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Data Communications Networking Devi
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