DTJ Number 3 September 1987 - Digital Technical Journals

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New ProductsFigure 9Photo of Computer Screeninterpolation techniques to estimate statisticsover any time period. Other routines determinethe current states of portions of the network,while still others determine the configuration ofthe network.The modify action routines change the contentsin the on-line database. Invoked by theparser, these routines use the services of CDMand are synchronous with respect to the database.They were made synchronous to avoid confusingusers whose commands were invalid. If anerror message indicating that a command wasinvalid was displayed long after the user issuedthe command, he might have proceeded withanother command and therefore might lose trackof the cause for the error.The remaining commands supported by the UIprogram perform such functions as providinghelp to the user, spawning a subprocess, invokingthe reports package, connecting to a differentkernel in the network, and the all-importantEXIT command.Presentation ModulesThe network manager interacts with NMCC viaeither a VT240 terminal or a VT241 terminal.The software managing that interaction is calledthe presentation software. It presents a consistentstructure for output on the screen and forkeystrokes entered by the user. The screen isdivided into four areas: an identification area,where the current display is shown ; the dataarea, where the information is shown; a commandarea; and a message rea. Figure 9 shows atypical screen format with' . the three areas.The UI program support,s a .number of presentationstyles. The information on any given pageis best displayed for the Oser in one particularstyle. Some of the styles upported are forms,tables, histograms, and maps. Each page isdesigned to present the data to the user in themost effective manner, given the limitations ofthe two terminals supported. We avoided the useof flashing warnings to a!Crt users to problems.Instead, each display presents data so that usersDigital TechnicalJournalNo. 3 September 1986139
The NMCCjDECnet Monitor Designcan spot problems quickly or observe behaviorpatterns in an advantageous way.The forms may contain text, numbers, meters,and color-coded values for text or numbers.Meters are graphs of numeric values; they mayalso show thresholds that, if exceeded, indicateproblems. These thresholds can be preset by theuser, although reasonable defaults are provided.The network map is a plot showing the topologyof the network. Systems are shown assquares and wires as lines connecting systems.(The shape of each line indicates the type ofwire .) The user can also request that eachcomponent shown on the map be color codedwith its status. The map communicates a largeamount of information in a comprehensible fashionto the user. Statistics can be displayed in theform of histograms, which plot values againsttime.A table is used to display each succeedinglylower level of the component hierarchy depictedin Figure 3. Each row in the table describes onecomponent "owned" by the requested .component.For example, for each system, a table is displayedlisting all lines known to be
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Netwo;king ProductsDigital Technica
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Editor's IntroductionRichard W. Bea
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BiographiesRaj Jain Raj Jain gradua
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BiographiesDavid R. Oran Dave Oran
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increase the sizes of networks, we
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New Productsmust be able to coexist
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A Digital Network Architecture Over
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---A Digital Network Architecture O
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Performance Analysis and Modeling o
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---Performance Analysis and Modelin
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Performance Analysis and Modeling o
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---Performance Analysis and Modelin
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--Performance Analysis and Modeling
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The DECnet/SNA Gateway Product• H
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The DECnetjSNA Gateway ProductFrom
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The DECnetjSNA Gateway Productcommu
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The DECnetjSNA Gateway ProductUSER
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The DECnetjSNA Gateway ProductThe u
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The DECnetjSNA Gateway ProductDECne
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The DECnetjSNA Gateway Productopera
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The DECnetjSNA Gateway ProductSegme
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The DECnetjSNA Gateway Product• O
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WiUiam R. HaweMark F. KempfAlanJ. K
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The Extended Local Area Network Arc
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Terminal Servers on Ethernet Local
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Page 89 and 90: Paul R. Beckjames A. KryckaThe DECn
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Page 101 and 102: john Forecastjames L. jacksonjeffre
Page 103 and 104: The DECnet,ULTRIX SoftwareComponent
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Page 119 and 120: The Evolution of Network Management
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Page 143 and 144: Editorial StaffEditor - Richard W.
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DTJ Number 3 September 1987 - Digital Technical Journals

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