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20 July 01 310443 Management Information Systems 9. Components of Workgroup Information Systems by Asst. Prof. Wichai Bunchua.

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Presentation on theme: "20 July 01 310443 Management Information Systems 9. Components of Workgroup Information Systems by Asst. Prof. Wichai Bunchua."— Presentation transcript:

1 20 July 01Email: wichai@bucc4.buu.ac.th1 310443 Management Information Systems 9. Components of Workgroup Information Systems by Asst. Prof. Wichai Bunchua E-mail : wichai@bucc4.buu.ac.th http://www.compsci.buu.ac.th/~wichai/

2 20 July 01Email: wichai@bucc4.buu.ac.th2 Components of Workgroup Information Systems Multiuser system alternative Commmunications standards Hardware Programs Data Procedures People

3 20 July 01Email: wichai@bucc4.buu.ac.th3 Multiuser System Alternatives Centralized systems Distributed systems Local Area Network (LAN) Hybrid systems Backbone networks Linled LANs Wide Area Network (WAN)

4 20 July 01Email: wichai@bucc4.buu.ac.th4 Centralized Systems Advantages Centralized control Established vendors and technology Low technicalrisk High capacity for TPS

5 20 July 01Email: wichai@bucc4.buu.ac.th5 Centralized Systems (cont.) Disadvantages High cost Highly trained personnel required for development and to a lesser extent for operations No local computing Vulnerable to loss of the single CPU

6 20 July 01Email: wichai@bucc4.buu.ac.th6 Distributed Systems Advantages Low start-up costs Tailorable, scalable Local computing possible Reliability of many computers

7 20 July 01Email: wichai@bucc4.buu.ac.th7 Distributed Systems (cont.) Disadvantages Lack of centralized control Multiplevendor problems Rapidly changing technology Performance cap

8 20 July 01Email: wichai@bucc4.buu.ac.th8 Hybrid Systems Advantages Greatest capacity Hybrid control Most tailorable and scalable

9 20 July 01Email: wichai@bucc4.buu.ac.th9 Hybrid Systems (cont.) Disadvantages Coplicated Expensive Difficult to set up High technical risk Some technical problems unsolved, to date

10 20 July 01Email: wichai@bucc4.buu.ac.th10 Communications Standards Data communication Protocols : Sets of rules for conducting data communications Systems Network Architecture (SNA) by IBM Digital Network Architecture (DNA) by Digital Equipment Corporation Open Systems Interconnection (OSI) model by ISO

11 20 July 01Email: wichai@bucc4.buu.ac.th11 The OSI Model Seven layers of the OSI model 1. Physical layer 2. Data-link layer 3. Network layer 4. Transport layer 5. Session layer 6. Presentation layer 7. Application layer

12 20 July 01Email: wichai@bucc4.buu.ac.th12 LAN Protocols Two typical protocols CSMA/CD (IEEE 802.3) Token ring (IEEE 802.5)

13 20 July 01Email: wichai@bucc4.buu.ac.th13 Hardware: LAN topology LAN topologies Bus topology Ring Topology Star topology

14 20 July 01Email: wichai@bucc4.buu.ac.th14 LAN Communication Media and Tranmission Three types of communication, or trnsmission, media, or cables used on a LAN Twisted pairs Coaxial cable Optical fiber Two strtegies or styles of transmission Baseband Broadband

15 20 July 01Email: wichai@bucc4.buu.ac.th15 Data-Link Protocols Two most common data-link protocols Contention protocol Token passing

16 20 July 01Email: wichai@bucc4.buu.ac.th16 Contention Protocols Contention (IEEE 802.3) Ethernet Nodes listen to line Transmit when line is idle Stop when collisions occur Almost always implemented on bus

17 20 July 01Email: wichai@bucc4.buu.ac.th17 Token Passing Protocol Token passing (IEEE802.4 - bus; IEEE802.5 - ring) Continuous stream of data on network Token indicates whether node can transmit Addresses in token indicate destination address of message Message removes by nodes that generate them

18 20 July 01Email: wichai@bucc4.buu.ac.th18 Programs System programs Network OS Two most popular Netware 386 from Novell LAN manager from Microsoft Network request processing Distributed database processing

19 20 July 01Email: wichai@bucc4.buu.ac.th19 Distributed Database Processing Two architectures of database processing on a LAN-based system Resource-sharing Client/server In client/server, the DBMS is separated into two parts The client DBMS The server DBMS

20 20 July 01Email: wichai@bucc4.buu.ac.th20 Application Programs in a Distributed System Database application programs Horizontal application products vertical application products

21 20 July 01Email: wichai@bucc4.buu.ac.th21 Data Nonconcurrent data sharing Concurrent data sharing Record-level sharing File-level sharing

22 20 July 01Email: wichai@bucc4.buu.ac.th22 Procedures User procedures for normal processing Operations procedures for normal processing User Procedures for failure recovery Operation procedures for failure recovery

23 20 July 01Email: wichai@bucc4.buu.ac.th23 People Workgroup operations people Users Operators Network LAN manager Data adminis people

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