Chapter 1: Introduction

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Nov 24, 2013 (4 years and 1 month ago)

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Business Data Communications,
Stallings

1

Chapter 1: Introduction

William Stallings


Business Data Communications


6
th

Edition



Business Data Communications,
Stallings

2

Information & Communication


Networking is critical to the new corporate
structures emerging in today’s businesses


Benefits of good networks


make geographically dispersed companies more
manageable


help top
-
heavy companies trim down middle
management


help companies break down barriers between
divisions.


make automation and quality enforcement easier to
implement.

Business Data Communications,
Stallings

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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

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Stallings

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4

Basic Communications Model



Example


Communication between a workstation and a
server


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Stallings

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Trends Driving

Data Communication


Traffic growth


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


Development of new services


Multimedia on demand and TV distribution


Advances in technology


Encourage and support increased growth and
new developments


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Stallings

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Key Technology Trends



Faster and cheaper computing platforms,
communications hardware, and software


Increasingly “intelligent” networks,
management and assessment tools


Growing importance of Internet, intranet
and extranet applications


Increasing use of and dependence on
mobile and wireless technology

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Stallings

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Enterprise Networks Drivers

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Stallings

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Enterprise Networks Convergence

A Three
-
Layer Model

1.
Applications:

Seen by end users


Voice calling, email, and instant messaging


Group collaboration and relationship management

2.
Enterprise Services:

Seen by network Manager


Design, maintenance, and support services


Authentication, capacity management, and QoS

3.

Infrastructure:
Enterprise

available assets


Links, LANs, WANs, and Internet connections


Carry information over data networks


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Stallings

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Unified Communication (UC)
Convergence

Web 2.0:

Second generation web capabilities

1.
User generated content (blogs, wikis, clips, etc.)

2.
Desktop

like user interface friendly capabilities

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

IP Enabling Contact Centers:
Enhance customer contact
center functionality and performance


IP Mobility:
Remote access technology and mobile employees
support

IP Wireless:
IP packet extended to support local and wide area
wireless communication



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Stallings

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Business Information
Requirements

Personal, Workgroup, and Enterprise

Unified Integrated Communications:


Voice communications


Data communications


Image communications


Video communications

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Stallings

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The Internet and

Distributed Applications

Internet: a key infrastructure for supporting
distributed applications

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

Distributed Applications: used in intercompany and
intra
-
company information exchange

Client
-
Server & Intranets: easy to implement
approach to most business applications

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Stallings

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Network Types


Local Area Networks (LANs)


Wide Area Networks (WANs)


Circuit Switched


Packet Switched


Frame Relay


ATM


Wireless Networks


Metropolitan Area Networks (MANs)

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Stallings

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Simplified Network Model

WAN

LAN

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Stallings

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Networking Configuration

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Stallings

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Transmission of Information


Transmission



-

c
onverts data into transmittable signals


Transmission Media


-

twisted pair, fiber, wireless, and coax


Communication Techniques

-

encoding, interface, protocols


Transmission efficiency

-

multiplexing, compression

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Stallings

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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



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Stallings

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Communications Standards


Importance


Choice of vendors and products


Competition leads to lower cost


Enovation through open standards


Organizations


Internet Society (ISOC), International Organization
for Standardization (ISO), the IEEE 802 LAN/MAN
Committee, the international Telecommunication
Union (ITU), and the National Institute of Standards
and Technology (NIST),


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Stallings

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Resources


Book Web Site


http://williamstallings.com


Usenet Newsgroups


IEEE Standards in Education


No Jitter


ZDNet


Journals


Business
-
oriented


Technical