Modern Transmission Networks

Table of Contents

Modern Transmission Networks

Outline

Early Transmission Networks

Modern Communications Networks

Fixed Access Networks

Mobile Access Networks

Enterprise Networks

Definition

Evolution of Digital Transmission Networks

Pulse Code Modulation

Time Division Multiplexing

Multiplexing Hierarchies

PPT Slide

Problems with PDH

Outline

What is SDH?

PPT Slide

The STM Frame

Information Content of the STM Frame

Multiplexing Structure

PPT Slide

PPT Slide

STM-N Frame Structure

Payload = 1 x VC-4

Payload = 63 x VC-12

The SDH Add-Drop Multiplexer

PDH vs SDH Multiplexer

Network Elements

Generic SDH Network Configurations

Interconnected Subnetworks

Protection Capabilities in SDH

Benefits of SDH

PPT Slide

SONET vs. SDH

Higher Capacity Required

Outline

Optical Transmission Networks

Optical Transmission Terminology

WDM vs DWDM

Optical Transmission Technology Enablers

Enabling Optical Transmission (1)

Enabling Optical Transmission (2)

Laser Technology

Enabling Optical Technology (3)

Enabling Optical Technology (4)

EDFA: Erbium Doped Fibre Amplifier

Conventional Transmission

DWDM Transmission

Equipment View

Client Independent

Transponders

Benefits of DWDM

Optical Transmission is Analogue

Outline

Industry Trends

PPT Slide

Impact on Transport Network

PPT Slide

Today’s Transport Network

Tomorrow’s Transport Network

Today’s Transport Network

Tomorrow’s Transport Network

References

Email: Brian.Stone:CompApp.DCU.IE

Home Page: www.compapp.dcu.ie/~bstone

Other information:
Presentation byJulie Connelly (Ericsson) to postgraduate students of MSc in e-Commerce, Telecommunications module (CA552)