2nd Ed Ch1 VA 090831rs Essay

Submitted By Priyank-Khamar
Words: 2522
Pages: 11

Chapter 1
Overview

Data Communications and NM

Chapter 1
Data Communications and
Network Management Overview

Network Management: Principles and Practice
© Mani Subramanian 2010

1

Chapter 1
Overview

Data Communications and NM

Objectives

• Telecommunications overview
 Data communications overview
 Evolution of converged networks
 Desktop processors and LAN technology
 Client-Server architecture in networking
 Internet and intranet
 Network communication protocols
 OSI and Internet standards
 Broadband networks and services
 Need for network management and NMS
 Operations, Administration, Maintenance, and Provisioning
 Network management architecture and organization
 Concept of Network Operations Center
 Perspectives of network management
 Network management system
 Look-ahead of network management technology

Notes

Network Management: Principles and Practice
© Mani Subramanian 2010

2

Chapter 1
Overview

Data Communications and NM

Telephone Network

• Modern network evolution from Telephone /
Telecommunications Network
• Characteristics of Telephone network
• Reliable - does what is expected of it
• Dependable - always there when you need it (remember 911?)
• Good quality (connection) - hearing each other well
• Reasons for QoS:
• Good planning, design, and implementation
• Good operation and management of network • Migration to new technologies –
• e.g., From analog to digital technology

Notes

Network Management: Principles and Practice
© Mani Subramanian 2010

3

Chapter 1
Overview

Data Communications and NM

Telephone Network Model
To other
Regional Center
Class 1 switch

Regional Center
Class 1 switch

Sectional Center
Class 2 switch

Sectional Center
Class 2 switch

Primary Center
Class 3 switch

Primary Center
Class 3 switch

Toll Center
Class 4 switch

Toll Center
Class 4 switch

End Office
Class 5 switch

End Office
Class 5 switch

Regional centers
Sectional centers
Primary centers
Toll centers
End offices
To other
Primary centers
Toll centers
End offices
To other
Class 4 toll points
End offices

Legend:
Loop
Direct Trunk
Toll-Connecting Trunk
Voice

Voice

Toll Trunk

Figure 1.1 Telephone Network Model

Notes
• Notice the hierarchy of switches
• Primary and secondary routes programmed
• Automatic routing
• Where is the most likely failure?
• Use of Operations Systems to ensure QoS

Network Management: Principles and Practice
© Mani Subramanian 2010

4

Chapter 1
Overview

Data Communications and NM

OSSs / NOC

• Operations Support Systems (OSSs) help manage the operation of networks
• OSSs in telecommunications monitor:
• Analog network parameters:
•S/N ratio, transmission loss, call blockage, etc.
• Digital network parameters:
• Packet loss, Packet delay, Throughput,
QoS, etc.
• Real-time management of network
• Trunk (logical entity between switches / nodes) maintenance system measures loss and S/N
Trunks not meeting QoS removed before customer notices poor quality
• Traffic measurement systems measure call drops and blockage. Additional switches or routers planned to keep the call blockage or drops below acceptable level
• OSSs distributed at central offices and customer premises • Network management done centrally from
Notes
Network Operations Center (NOC)

Network Management: Principles and Practice
© Mani Subramanian 2010

5

Chapter 1
Overview

Data Communications and NM

Data and Telecommunication Network
Data communication network

Terminal

Terminal
Host

Modem

Modem

Loop

Modem

Loop

Loop

Voice

Voice

Telecommunication network

Figure 1.3 Data and Telecommunication Networks

Notes
• Computer data is carried over long distance by telephone (telecommunication network)
• Output of telephone is analog and output of computers is digital
• Modem is used to “modulate” and “demodulate” computer data to analog format and back
• Clear distinction between the two networks is getting fuzzier with modern multimedia networks
Network Management: Principles and Practice
© Mani…