1. 30 Apr 2001wichai@bucc4.buu.ac.th1 310443 Management Information Systems 12. Components of Enterprise Information Systems by Asst. Prof. Wichai Bunchua E-mail : wichai@bucc4.buu.ac.th http://www.compsci.buu.ac.th/~wichai

2. 30 Apr 2001wichai@bucc4.buu.ac.th2 Components of Enterprise Information Systems Hardware Programs Data Procedures People

3. 30 Apr 2001wichai@bucc4.buu.ac.th3 Hardware LANs Teleprocessing Systems Internets Backbone Networks

4. 30 Apr 2001wichai@bucc4.buu.ac.th4 LAN Characteristics Multiple microcomputers connected together One or more file, database, or other servers Bus ans ring topologies are common Computers within a mile or two of each other Generally fewer than 50 computers

5. 30 Apr 2001wichai@bucc4.buu.ac.th5 Teleprocessing Systems Characteristics Processing performed by cenralized computer Users access applications via dumb terminals or micros emulating dumb terminals

6. 30 Apr 2001wichai@bucc4.buu.ac.th6 Basic Components End-user hardware Communication media WANs and MANs Polling Multiplexing Processing hardware

7. 30 Apr 2001wichai@bucc4.buu.ac.th7 Communication Line Classifications Line speed Voice-grade (300-9600 bits per second) Wideband (500,000 bits per second or more) Line mode Analog Digital Line type Full-duplex Half-duplex Simplex

8. 30 Apr 2001wichai@bucc4.buu.ac.th8 Internets Charateristics Multiple LANs interconnected Requires Bridge Gateway Router

9. 30 Apr 2001wichai@bucc4.buu.ac.th9 Backbone Networks A large central network to which all the computers in an enterprise are connected It provides the infrastructure for enterprise telecommunications Communications backbones support at least three functions E-mail between users File transfer among computers Terminal emulation

10. 30 Apr 2001wichai@bucc4.buu.ac.th10 Backbone Networks Characteristics Network supports communications among computers of any type Hundreds or thousands of computers and terminals possible Wide geographic distribution possible via WAN

11. 30 Apr 2001wichai@bucc4.buu.ac.th11 Programs System programs Teleprocessing communications control Network communication control Horizontal Market Application programs Vertical Market Application programs Cuustom-developed Application programs

12. 30 Apr 2001wichai@bucc4.buu.ac.th12 Data Departmental data independencies Distributed database system International data communications

13. 30 Apr 2001wichai@bucc4.buu.ac.th13 Procedures The need for controls EDP controls Management controls Organization controls Data center resource controls I/P/O controls

14. 30 Apr 2001wichai@bucc4.buu.ac.th14 The Need for Controls Fictitious sales Illegal funds transfer Theft of equipment

15. 30 Apr 2001wichai@bucc4.buu.ac.th15 Types of Computer Crime Manipulating computer input Changing computer programs Stealing data Stealing computer time Stealing computer programs

16. 30 Apr 2001wichai@bucc4.buu.ac.th16 Categories of EDP Controls Management Organizational Data center resource I/P/O

17. 30 Apr 2001wichai@bucc4.buu.ac.th17 Types of Management Controls Attend to MIS applications Manage MIS activity Follow up on problems Take control procedures seriously

18. 30 Apr 2001wichai@bucc4.buu.ac.th18 Data Center Resource Control Control access to data center Locate data center in protected environment Pland and document operating procedures Protect libraries of program Plan and execute backup procedures Plan and practice recovery procedures Protect data center from natural hazards Protect international data center

19. 30 Apr 2001wichai@bucc4.buu.ac.th19 I/P/O Controls Input Documentation of authorized input format Separation of duties and authorities Verificaion of control totals On-line system input controls

20. 30 Apr 2001wichai@bucc4.buu.ac.th20 I/P/O Controls (cont.) Processing Documented operating procedures Reviews of processing logs Adequate program testing Output Documented output procedures Control over disposition of output Users trained to examine output

21. 30 Apr 2001wichai@bucc4.buu.ac.th21 People’s Roles Four different roles Use Development Operations Management

22. 30 Apr 2001wichai@bucc4.buu.ac.th22 The MIS Department Data processing Development -- System analysts, programmers Operation -- Operators, data-entry System support --System programmers Data administration Data administrator (DA) Database administrator (DBA) End-user support