the pc solution

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chapter13
section IV Development
for the Small Enterprise
Systems Analysis and Design
the pc solution networking solutions internet,
intranet, and extranet solutions the cornucopia
case portfolio project
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Chapter Objectives

• When you complete this chapter you will be able
  to
• Describe the key hardware issues relating to the
  system under development
• Describe the key software issues relating to the
  system under development
• Install an information system that complies with
  the computers hardware and system software
  environment
• Describe how networking technology influences
  small-enterprise information systems
• Describe how Internet and intranet technologies
  influence small-enterprise information systems

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The PC Solution
Inherent in the small-enterprise project is the
assumption that a desktop computer could function
as the hardware platform for the information
system. This assumption includes the possibility,
perhaps inevitability, that the system will
include several desktop computers networked
together. Regardless of the number of computers
employed in the system, there are several
fundamental desktop-related issues the analyst
must consider.
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Figure 13-1 Evolution of the PC Microprocessor
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Figure 13-2 PC Hardware Diagram
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Figure 13-3 Critical Hardware Performance
Issues and Acronyms
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Figure 13-4 PC Operating System Diagram
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Figure 13-5 Critical System Software Issues
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Figure 13-6 System Environment
Users
Information Systems
4GL Products
System Software
System Hardware
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Figure 13-7 Windows XP User Accounts Dialog
Boxes(top middle)
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Figure 13-7 Windows XP User Accounts Dialog
Boxes(bottom)
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Figure 13-8 Adding PRC to the Start Menuand as
a Shortcut Icon
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Figure 13-9 Information System Security
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Networking Solutions
Networking is fast becoming the accepted baseline
standard for information systems of all
sizes. The small enterprise can begin with a
simple modem connection to the Internet and a
peer-to-peer network, and then progress to a
local or even wide area network. The analyst
working on a small-enterprises first-time
information system should be alert to the future
networking requirements of the enterprise, even
if the present design does not include a network.
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Figure 13-10 Network Diagram
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Figure 13-11 Wireless LAN Diagram
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TCO and the Net PC
TECHNOTE 13-1
Total cost of ownership (TCO) is a term that
describes the sum of costs associated with a
computer system acquisition, installation, and
maintenance. A net PC or thin client describes a
desktop computer tailored to perform the tasks
required of a desktop computer installed as a
network client. In theory, TCO is minimized if
each piece of the system is perfectly matched to
its anticipated performance requirements.
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Figure 13-12 File Server Diagram
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Figure 13-13 Database Server Diagram
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Figure 13-14 Network Productivity Products
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Applications Development without Programming
TECHNOTE 12-2
A computer information system is broader in scope
and function than a customized application. An
informal SDLC methodology may be helpful to the
custom application developer. While many custom
application building tools exist, developing an
information system still requires programming
skills.
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E-mail Privacy
Thinking
Critically

• To what degree is the analyst responsible for
  advising network users and administrators about
  unauthorized use of network resources?
• What course of action, if any, should the analyst
  recommend to the network administrator?
• How might you react if you discovered that the
  network administrator had read your e-mail?

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Figure 13-15 PRCs Peer-to-PeerLAN Upgrade
Specifications
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Figure 13-16 PRCs Peer-to-PeerLAN Upgrade
Diagram
Reference Figure 12-17 Prototype Review Report
Content
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Figure 13-17 PRCs File ServerLAN Upgrade
Specifications
Existing System Three stand-alone 650 MHz
Pentium desktop computers, each with 128 MB of
RAM, 10 GB of hard disk storage, 24X CD-ROM,
Windows, and Microsoft Office Pro. One 15
ppm, 300 dpi, 8 MB RAM laser printer, with an
electronic switch connected to the three
microcomputers.
Client Hardware Ethernet network interface
cards (3 _at_ 35) 105 Cat 5 twisted pair (1
box) 70 Cable connectors 10 256 MB
RAM (3 _at_ 50) 150 4-port Cable/DSL Web Safe
Router 130 Printer-server interface card
350 8 MB printer memory 50
Subtotal 5,909 Tax and Shipping 600
Installation (8 hours _at_ 80) 640 Grand
Total 7,149
Client Software Microsoft Office Pro upgrade (3
client license) 300
Server Bundle Dell PowerEdge 1400SC
(Small-Business Server) 4,744
Intel Pentium III 1.4 GHz w/512K cache 512
MB SDRAM 15 inch monitor 36 GB hard
drive 3.5 inch disk drive 48X CD-ROM
Operating system Microsoft Small Business Server
2000 UPS APC SmartUPS 700, 700VA Tape
backup unit PowerVault 100T 20/40 G Internal
Tape backup software CA Arcserve Server
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Internet, Intranet, and Extranet Solutions
Peer-to-peer and local area networks are confined
to relatively small geographic areas. Internet,
intranet, and extranet provide the potential for
limitless extension of the enterprise
network. Until fairly recently, these networking
extensions merely provided a transporting medium
for information products. Now there are powerful
tools and languages that permit the analyst to
distribute both data and computer processing to
multiple network resources (e.g., clients,
database servers), thus relieving the servers
processor of workload and reducing the volume of
data transmission traffic on the network.
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Figure 13-18 Extranet Diagram
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Figure 13-19 Data-Driven Web Page Scenario
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Figure 13-20 Client/Server Database Model
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Figure 13-21 Web-Accessible Database Options
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The Cornucopia Case
THE CORNUCOPIA CASE
The Web site is the only networking technology
specified in the current design.
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Figure 13-22 Cornucopia Windows Interface
Cornucopia Information System
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Figure 13-23 Cornucopia Web Page Files
CDMaster.htm CDNotes.htm Mlist.htm
Rclasses.htm SMsg.htm Home.htm
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Figure 13-24 Cornucopia HTML Code (Cindex.htm)
Cindex.htm   ltHTMLgt ltHEADgt ltTITLEgtCornucopialt/TITL
Egt lt/HEADgt   lt! Frame definition gt lt! Divide the
screen into two columnsgt ltFRAMESET COLS
"200,"gt lt! Divide the first column into two
rows, define their source filesgt ltFRAMESET
ROWS"130,"gt ltFRAME NAME"FrLogo" SRC
"Clogo.htm" MARGINWIDTH "0"
MARGINHEIGHT "0" SCROLLING"none" NORESIZEgt
ltFRAME NAME"FrTOC" SRC "Cpiatoc.htm"
MARGINWIDTH "0" MARGINHEIGHT "0"gt
lt/FRAMESETgt lt! Define the second column's
initial source filegt ltFRAME NAME"FrMain" SRC
"Home.htm"gt lt/FRAMESETgt   lt/HTMLgt
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Figure 13-25 Cornucopia JavaPot.htm (partial)
ltHTMLgt ltHEADgt ltTITLEgtUntitledlt/TITLEgt ltSCRIPT
Language "JavaScript"gt // Define global
variables var QNumber 0 var
UserAns null // Define and initialize an
array function QuizArr(n)
this.length n for (var i1iltni)
thisi0 return this  
// Define a custom object with two properties
function MusicQuestion(Question,Answer)
this.Question Question
this.Answer Answer   // Display the
question, clear and set focus to the answer text
object function ShowQuestion()
QNumber 1 if (QNumber gt
MusicQuiz.length) alert("Sorry,
there are no more questions.") QNumber
1 document.GetAns.DisplayQuestion.valu
e (MusicQuizQNumber.Question)
document.GetAns.UserInput.value ""
document.GetAns.UserInput.focus()
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Figure 13-26 Cornucopia Project Status Week 12
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Figure 13-27 Cornucopia Project Budget Week 12
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Figure 13-28 Cornucopia Future Network Diagram
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Portfolio Project
Portfolio
project

• Team Assignment 13 Networking
• Prepare a slide show illustrating the various
  pages of the enterprise Web site.
• Prepare a brief summary of the current and
  potential use of networking technology in the
  solution to your project.

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Chapter Summary

• The analyst must address diverse hardware and
  software issues
• Hardware speed
• memory
• storage
• Software user interfacing
• resource management
• resource sharing
• Networking hardware and software decisions
  complicate this process.

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