NETCOMM Chapter 01

8/7/2019 NETCOMM Chapter 01

1/19

Business Data Communications,

Stallings

1

Introduction


2/19

2

Information & Communication

Networking is critical to the new corporate

structures emerging in todays businesses Benefits of good networks

make geographically dispersed companies moremanageable

help top-heavy companies trim down middlemanagement

help companies break down barriers betweendivisions.

make automation and quality enforcementeasier to implement.


3/19

3

3

Basic Communications Model

Source

Generates data to be transmitted Transmitter

Converts data into transmittable signals

Transmission System Carries data

Receiver

Converts received signal into data

Destination

Takes incoming data


4/19

4

4

Basic Communications Model

Example

Communication between a workstation and aserver


5/19

5

Trends Driving Data Communication

Traffic growth

Voice & data over Internet Protocol (IP); localand long distance

Development of new services

Multimedia on demand and TV distribution

Advances in technology

Encourage and support increased growth andnew developments


6/19

6

Key Technology Trends Faster and cheaper computing platforms,

communications hardware, and software Increasingly intelligent networks,

management and assessment tools

Growing importance of Internet, intranetand extranet applications

Increasing use of and dependence onmobile and wireless technology


7/19

7

Enterprise Networks Drivers


8/19

8

Enterprise Networks Convergence

A Three-Layer Model

Applications: Seen by end users Voice calling, email, and instant messaging

Group collaboration and relationshipmanagement

Enterprise Services: Seen by network

Manager Design, maintenance, and support services Authentication, capacity management, and QoS

Infrastructure: Enterprise available assets

Links, LANs, WANs, and Internet connections Carry information over data networks


9/19

9

Unified Communication (UC)

Convergence

Web 2.0: Second generation web capabilities

User generated content (blogs, wikis, clips, etc.)

Desktoplike user interface friendly capabilities

Real-Time Communication (RTC): desktop andmobile software clients functionalities

IP Enabling Contact Centers: Enhance customercontact center functionality and performance

IP Mobility: Remote access technology and mobileemployees support

IP Wireless: IP packet extended to support localand wide area wireless communication


10/19

Unified Communication (UC)

Convergence


11/19

Unified Communication Does not only integrates communication

channels

Also integrates commnication functionsdirectly into business application Three levels of integration

Personal unified communication PDAs, IMs

Workgroup unified communication Supports collaborative efforts

Enterprise unified communication Integrates communications with enterprise-wide anddepartmental-level applications, business processesand workflows


12/19

12

Business Information

Requirements Personal, Workgroup, and Enterprise

Unified Integrated Communications:

Voice communications

Data communications

Image communications Video communications


13/19

13

The Internet and

Distributed Applications Internet: a key infrastructure for

supporting distributed applications

TCP/IP: standard open architecture protocolsuite universally used in data networks

Distributed Applications: used inintercompany and intra-companyinformation exchange

Client-Server & Intranets: easy to

implement approach to most businessapplications


14/19


15/19

15

Simplified Network Model

WANWAN

LANLAN


16/19

16

Networking Configuration


17/19

Business Data Communications,

Stallings

17

Transmission of Information Transmission

converts data into transmittable signals

Transmission Media

twisted pair, fiber, wireless, and coax

Communication Techniques

encoding, interface, protocols

Transmission efficiency

multiplexing, compression


18/19

18

Management Issues Network Security

Confidentiality

Integrity

Availability

Network Management

Highly distributed peer-to-peer networks

Complexity of managing and maintaining

Reliable operation at all times

Skilled personnel and communication costs


19/19

19

Communications Standards Importancepetition leads to lower cost

Enovation through open standards

Organizations

Internet Society (ISOC), InternationalOrganization for Standardization (ISO), the IEEE

802 LAN/MAN Committee, the internationalTelecommunication Union (ITU), and theNational Institute of Standards and Technology(NIST),

Documents

NETCOMM Chapter 01