1. Chapter 2
Information Systems
Infrastructure

2. 
Is it about IT Infrastructure? Is it about Network
Infrastructure?

ISI is:
 a base of shared technological, human, and
organizational capabilities that provides the
foundation for computer-based business
application systems in the form of services to a
range of users

ISI includes the following elements:
i. HR and organizational capabilities
ii. IS architecture
iii. data center network
iv. network connectivity
v. bandwidth management
vi. communication protocols
vii. network management

3. 




Technological capabilities of people
Attitudes of people regarding the use of IS
Culture
Structure
Processes

4. 



Mainframe Computing Architecture
Client-Server Computing Architecture
Web Computing Architecture
Distributed Component Architecture

5. Mainframe Computing
Architecture
Mainframe
Data Management
Business Processes
Analysis & Presentation
Terminal

6. Two-tier Client-Server Architecture
Data Base
Management
Systems
User
interface
Business
Logic

7. Three-Tier Client-Server
Architecture
Application Servers
Clients
Broker/
Naming
Server
User
Interface
Connectivity
Data models
Applications
Connectivity
Management
ODBC
Data Base Servers
Data
Base

8. The “Web” as a Client-Server System
Servers (ERP, Web and database)
Browser Software
(Netscape)
Page
Client
• Presentation
Internet/ Extranet/
intranet
Servers (ERP, Web and database)
Mumbai
e.g., HLL
New Delhi
e.g., HLL
Server
• Simple data [static Web pages]
• Business logic (cgi scripts)
with access to data (often RDBMS)
[dynamic Web pages]

9. Schematic of Data Center Network
Client
WAN Clout
Client
Campus Backbone
D
a
t
a
C
e
n
t
e
r
Switch
Subnet 1
Application
Server
Application
Server
Application
Server
Database
Server
Database
Server
Database
Server
Subnet 2