Data Communications Networking Devices - 4th Ed.pdf

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INDEX ___________________________________________________________________________ 851see also bridges; gateways; routersLAN switches 599±617advantages 604ATM 615±17backbone operation 612±13backpressure 614±15basic components 603±4delay times 604±5hybrid 608operation 602±5, 611±17speed incompatibilities 614±15techniques 605±11LANcity LCP modem 494±7access protocol 495±6operating rate comparison 497LAP-M protocol 453Laser diode LD) 767Leased lines 2, 13±14based networks 178±83routing 13types 179utilization examples 179±83Lempel-Ziv 454Length ®eld 214, 324Light detector 770±1Light emitting diode LED) 767±8Light sources 767±8Line attachment bases LABs) 700±1Line connections 2±4Line discipline 33±4Line drivers 479±84applications 483±4direct connection 480±2utilization 482Line interface couplers LICs) 700±2Line selection guide 5Line-sharingversus modem-sharing 709versus multiplexing 707Line-sharing units 706±11constraints 709±10operation 707±8Line structure 31±2Line-switching network, port selector729±30Linear predictive coding 661±3Link state routing protocol 579±81Listeners 292±3Local area networks LANs) 269±349access method 292±6common software access 273comparison to WANs 270±2data routing 272data transmission 271digital signaling methods 7electronic mail 273error rates 271gateway access to mainframes 273geographic area 270±1origin 270overview 269±73ownership 271peripheral sharing 273regulation 271±2security 794signaling methods 277±9technical characteristics 296technological characteristics 274±96topology 272, 274±7transmission medium 279±92type of information carried 272utilization bene®ts 273Local Exchange Carrier LEC) 524Locally administered address 323,339±40Logical Link Control LLC) 299±300overview 325±6sublayer 345±8Longitudinal redundancy checkLRC) character 53Loopback circuits, HSSI 103±4Low-capacitance shielded cable 107Low-entry networking LEN) nodes248Lucent Technology 27LZW algorithm 761LZW coding 761±3Mainframe computer operations 25±6Maintenance and operator subsystemMOSS) 700±2Manchester coding 279, 335Mark parity 48Markov model 458Matrix switches 744±5, 756Media Access Control MAC) 299,311, 343±5overview 325Medium attachment unit MAU) 302,305Microcom <strong>Networking</strong> ProtocolMNP) 444±54Class 5 data compression 454±7Class 7 enhanced data compression457±9compatibility issues 453±4PDUs 448±52Minimum-spanning-tree 552±3algorithm 839problems 840technique 837±9Modem ready MR) indicator 426Modem-sharing units 706±11constraints 709±10operation 707±8with port-sharing units 715Modem-sharing versus line-sharing709Modems 7±8, 355±43056 kbps 415±17300 bps 380±2300 to 1800 bps 3832400 bps 3884800 bps 391±39600 bps 393±914 400 bps 399±40519 200 bps 405±928 800 bps 409±1533 600 bps 415asymmetrical 419±20automatic equalization 378basic components 356±62broadband 489±504cable TV CATV) 489±94telephone cabling infrastructure489±91cable 494±504command sets 431±9compatibility 380±417, 438±9,453±4, 461data compression 454±61disabling echo suppressors 383DSL 499±504echo suppression 382equalization 377±8error detection and correction439±54rationale 443±4fabrication 375±6features 373±80full-duplex 382handshaking 421±2intelligent 375, 431±66limited-distance 484±9contrasting devices 485diagnostics 488operational features 487±8rationale and status 485transmission media 485±7line use classi®cation 374±5local analog loopback test 429local digital loopback test 428±9loopback tests 428manual equalization 377±8multiple speed selection capability379±80multipoint 472±7circuit factors 473±5developments 476±7remote testing 477throughput problems 475±6multiport 466±71application example 467±8capability 378±9selection criteria 467standard and optional features470±1negotiation problems 462±3non-Hayes 438non-redundant coding 396±8non-standard 418±21operations 380±417packetized ensemble protocol418±19ping-pong 421problem resolution 422±30registers 437±8remote analog loopback test 429remote digital loopback test 429±30reverse channel 376secondary channel 376±7security 477±8security capability 379self-test 427signal conversion 7±8, 356synchronization 378synchronous dialing language465±7
852 __________________________________________________________________________ INDEXModems cont.)testing 427±30throughput issues 461±2transmission mode 373transmission technique 373±4transmitter section 356±8types 373±80using modem indicators 423±7voice/data capability 380voice/data operation 463±5wraparound unit 430Modulation 277, 363±5combined techniques 367±8techniques 369±72Modulators 358Monitor bit 338Morse code 39Multicast address 322Multichannel cable 777Multidrop line routing analysis837±42Multi-line controller MLC) 698Multiple access unit MAU) 308Multiple fallback switches 747Multiplexers 626±86comparison with other devices 627device support 627evolution 626sizing 823±6, 826±8utilization 180±1, 651Multiplexingeconomics 640±2techniques 627±40versus line-sharing 707versus packet switching 183±4Multipoint lines 33Multiprotocol Transport <strong>Networking</strong>MPTN) 597±8Multistation Access Unit MAU)276±7, 328±9cabling and device restrictions329±34Name server 223±4Narrowband ISDN N-ISDN) 153National Bureau of Standards NBS)62National Institute of Standards andTechnology NIST) 62National standards organizations59±63NCP Packet Switching InterfaceNPSI) 587Near End CrossTalk NEXT) 287±8Negative acknowledgement NAK)character 55, 123NetWare IPX 571Network Addressable Units NAUs)238Network Control Program NCP) 237Network control system NCS) 430Network frame rate determination843±6Network graph 553Network interface card NIC) 302,305Network layer 73Network nodes NNs) 248Network redistribution 611±12Network terminating unit NTU) 6,517Network-to-Node Interface NNI)259Nodes 676Non-data symbols 335±7Non-redundant main ring paths 329North Americabinary 7 zero code suppressionB7ZS) 527binary 8 zero substitution B8ZS)527±8framing formats on T1 lines 520±5NT1 network termination 1) 162NT2 network termination 2) 163Null NUL) character 121Null compression 758NWay autosensing logic 317Off hook OH) indicator 425Of®ce Channel Unit OCU) 507One-time passwords 807Open Systems Interconnection OSI)layers 71±4see also speci®c layersReference Model 59, 64, 70±4data ¯ow 74Operating mode and character display26Optic ®ber cables, electromagneticnon±susceptibility 773Optical cables, types 770Optical ®bers 768±9bandwidth 773electrical isolation 774security 774signal attenuation 774splicing 775types 769weight and size 774see also ®ber optic transmissionsystems, dedicated cablesystemOptical modem 771±2Optical multiplexers 772, 777±8Packet assembler/disassemblersPADs) 686±92applications 687±8PC based utilization 691types 688X.3 parameters 688±92Packet ®ltering 808±10Packet switching networks 183±201architecture 186±7call establishment 190±1construction 184delay problems 192±3¯ow control 191ITU recommendations 184±5packet format and content 188±9packet formation 187±8see also fast packet switchingPacketized Ensemble Protocol PEP)503Parallel bridging 560±2Parallel interface extenders 529±33application examples 532±3components 532operation 531Parametric detectors 662Parity checking 48±9®le transfer problems 50±1undetected errors 49±50Passwordcombinations 781±2one-time 807shortcomings 779±81static 806Path control layer 241Path costs 554±5Pattern substitution 759Payload Type Identi®er PTI) 261Permissive arrangement 114Phase modulation 365Phase-shift keying PSK) 365Physical layer 72, 75±117, 241, 257,312±13subdivision 300Plugs 111±17Point of presence POP) 14Point-to-point lines 32Poisson distribution 826, 828, 830,831, 835±6Poisson formula 826±9Poll and select line discipline 33±4Polling process 709Port-based switching 608±9Port selectors 715±16, 722±30computer site operations 723±4costs 727±8features 728±9line-switching network 729±30load balancing 728operation 723±4types of devices 722±3usage decisions 724±6Port-sharing units 711±16operation 713±15usage 713±15with modem-sharing units 715Positive acknowledgement ACK)communications controlcharacter 54Preamble ®eld 321Presentation layer 73, 242±3Private key encryption 791Programmable arrangement 115Protective ground GND, Pin 1) 82±3Protocol converters 720±1, 730±5applications 734±5character versus block modeoperation 733±4conversion categories 731±2data code/speed conversion 731device functionality conversion732±3device operation conversion 732operation 731
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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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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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4.2 MODEMS ________________________
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4.2 MODEMS ________________________
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4.2 MODEMS ________________________
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4.2 MODEMS ________________________
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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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4.5 MULTIPOINT MODEMS _____________
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4.6 SECURITY MODEMS _______________
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4.7 LINE DRIVERS __________________
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4.8 LIMITED-DISTANCE MODEMS _______
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4.8 LIMITED-DISTANCE 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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4.12 PARALLEL INTERFACE EXTENDERS _
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6.1 MULTIPLEXERS __________________
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