Network Infrastructure and Architecture: Designing High-Availability Networks

13

NETWORK DESIGN: EFFICIENT, SURVIVABLE NETWORKS

13.1 Introduction

13.2 SONET

13.2.1 Overview

13.2.2 Protection Switching

13.3 Optical Transport Network

13.3.1 Motivations, Goals, and Approaches

13.3.2 OTN Standards Support

13.3.3 Basic OTN Technical Concepts

13.3.4 OTN Deployments

13.4 Automatically Switched Optical Networks

13.4.1 Overview

13.4.2 Standardization Efforts

13.4.3 Architectural Principles for ASON

13.5 Status and Deployments

Key Points

References

13.1 INTRODUCTION

Organizations have become highly dependent on their network infrastructure. As early as the mid-1990s it was recognized that “… we have reached a state where ‘the corporation is the network.’ Hence, the entire business viability of a corporation may well depend on the network it has in place …” (Minoli and Alles, 1996). One need only think of the importance of the network to a bank, a brokerage firm, an online business such as reservations or e-commerce, the aviation industry, or the military, to name just a few examples. It follows that organizations seek to have networks with high availability and self-healing capabilities. Requirements for availability in the 99.999% range are common for many institutional networks. Carriers and service providers need to deploy network infrastructures that meet these end-user needs. A properly designed carrier network will achieve high availability. Such a network will make full use of the network elements (NEs) and advanced technologies discussed in earlier chapters. ...