Data Communications Networking Devices - 4th Ed.pdf

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468 _________________________________ WIDE AREA NETWORK TRANSMISSION EQUIPMENTFigure 4.61 Multiport modem application example. A pair of four-channel multiportmodems services two CRTs, a 1500 cps printer, and three low speed terminal devices overa single transmission linemultiplexed 1200 bps channels with the three synchronous unmultiplexed channelsinto a single multiplexed synchronous data stream. At the central site where thecomputer is located, the multiport modem at that end splits the 28 800 bps streaminto four data streams; one data stream is then channeled through another 3-channel, traditional TDM, whose output data streams in turn are connected to thecomputer. The 3-channel TDM takes the 7200 bps synchronous data stream fromthe multiport modem and demultiplexes it into three 1200 bps asynchronous datastreams, which are passed to the appropriate computer ports. The remaining datastreams produced by the demultiplexer in the multiport modem are connected tothree additional computer ports. As this example demonstrates, the high-speedmultiport modem's utilization in conjunction with other communications componentspermits a wide degree of ¯exibility in the design of a data communicationsnetwork.A few examples of multiport modem and channel combinations available arelisted in Table 4.28. It should be noted that not all multiport modem channelcombinations listed in Table 4.28 may be available for a particular vendor's modemthat operates at the indicated aggregate throughput, since some vendors offer only a4-port multiplexer with their modem, while other vendors may offer an additionalnumber of ports.Although most manufacturers of multiport modems produce equipment thatappears to be functionally equivalent, you should exercise care in selectingequipment because of the differences that exist between modems but are hard toascertain from vendor literature. Although the modes of operation available forutilization are quite similar regardless of manufacturer, the number of ports or datachannels supported by a multiplexer can differ signi®cantly. Another varianceconcerns the use of an independently controlled carrier signal in some multiportmodems. By using multiport modems that permit an independently controlledcarrier signal for each channel, you can combine several polled circuits and furtherreduce leased line charges.
4.4 MULTIPORT MODEMS _________________________________________________________ 469Table 4.28 Examples of multiport modem channel combinations. The wide degree of¯exibility that can be provided by multiport modems in a network con®guration is a functionof several factors: throughput, available modes and channels, and data ratesModemMultiport speed combinationsaggregate Operatingthroughput mode 1 2 3 4 5 6 7 819 200 1 192002 16800 24003 14400 48004 14400 2400 24005 12000 72006 12000 4800 24007 12000 2400 2400 24008 9600 96009 9600 4800 480010 9600 4800 2400 240011 7200 7200 480012 7200 4800 2400 2400 240013 7200 2400 2400 2400 2400 2400 240014 4800 4800 4800 480015 4800 4800 4800 2400 240016 4800 4800 2400 2400 2400 240017 4800 2400 2400 2400 2400 2400 240018 2400 2400 2400 2400 2400 2400 2400 240014 400 1 144002 12000 24003 9600 48004 9600 2400 24005 7200 72006 7200 4800 24007 7200 2400 2400 24008 4800 4800 48009 4800 4800 2400 240010 2400 2400 2400 2400 2400 24009600 1 96002 7200 24003 4800 2400 24004 2400 2400 48005 2400 2400 2400 24006 4800 48007200 1 72002 4800 24003 2400 2400 24004800 1 48002 2400 2400
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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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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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4.11 CHANNEL SERVICE UNITS ________
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4.12 PARALLEL INTERFACE EXTENDERS _
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