Data Communications Networking Devices - 4th Ed.pdf

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3.2 TECHNOLOGICAL CHARACTERISTICS ___________________________________________ 295Figure 3.10Token-Ring operationwhen it has a free token, token passing eliminates the requirement for collisiondetection hardware. Due to the dependence of the network upon the token, the lossof a station can bring the entire network down. To avoid this, the design characteristicsof Token-Ring networks include circuitry that automatically removes afailed or failing station from the network as well as other self-healing features. Thisadditional capability is costly; Token-Ring adapter cards in 1998 were typicallypriced at two to three times the cost of an Ethernet adapter card.Due to the variety of transmission media, network structures, and accessmethods, there is no one best network for all users. Table 3.7 provides a generalized
296 ________________________________________________________ LOCAL AREA NETWORKSTable 3.7Technical characteristics of LANsTransmission mediumTwisted-pair Baseband Broadband Fiber opticCharacteristic wire coaxial cable coaxial cable cableTopology Bus, star or Bus or ring Bus or ring Bus, ring orringstarChannels Single Single channel Multi-channel Single,channelmulti-channel<strong>Data</strong> rate Normally 4 Normally 2 to Up to 400 Mbps Up to Gbpsto 16 Mbps 10 Mbps, up toup to 1 Gbps 100 Mbpsobtainable obtainableMaximum nodes Usually
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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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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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4.1 ACOUSTIC COUPLERS _____________
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4.3 INTELLIGENT MODEMS ____________
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4.4 MULTIPORT MODEMS ______________
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4.6 SECURITY MODEMS _______________
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4.7 LINE DRIVERS __________________
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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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