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    Concise Guide to OTN optical transport networks
    Concise Guide to OTN optical transport networks
    Concise Guide to OTN optical transport networks
    Ebook90 pages54 minutes

    Concise Guide to OTN optical transport networks

    By alasdair gilchrist

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    About this ebook

    OTN networks are terribly complex and they really stress the beginner. It is not just the alphabet soup, or the acronyms for every link or connection that confuses most, it is the prospect of containers, and multiplexing bit-rates and whatever. But it is not that difficult and in this book we will show you how you can come to terms with OTN at the level of knowledge that you might require. This book opens with a high level overview of OTN (OTH & G.709) its purpose, goals and layered architecture and that will be sufficient level of knowledge for the executive or project manager. In subsequent chapters it goes deeper into the signals within each of the operational layers and this will be of interest to those in technical discussions with optical system technicians and vendors (you can speak the same techie language). The later chapters dive deeper into OTN maintenance (alarms & indicators) and network monitoring which will aid support personnel in a NOC.

    LanguageEnglish
    PublisherRG Consulting
    Release dateJun 29, 2015
    ISBN9781513071800
    Concise Guide to OTN optical transport networks

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      Book preview

      Concise Guide to OTN optical transport networks - alasdair gilchrist

      Concise Guide to Optical Transport Networks (OTN)

      Chapter 1 – An Introduction to OTN

      Chapter 2 - WDM and the OTH

      Chapter 3 - OTH Signal Structure

      Optical Multiplex Section Layer Network (revisited)

      Optical Multiplex Section Termination

      Optical Transmission Section Layer Network

      Optical Transmission Section Termination

      OMS/OCh Adaptation

      Connection Functions

      Chapter 4 – Overhead Bytes

      Chapter 5 - Optical Network Management

      Introduction

      This book aims to de-mystify the overly complicated descriptions of OTN (optical transport networks). It takes the G.709 standard and distills it into digestible chunks that a mere mortal can consume. And with some perseverance understand.  It is not easy, but this book is aimed at everyone with an interest in optical transmission, from consultants that need a high-level overview to network operation center (NOC) technicians that have to monitor and manage these optical networks.

      The one thing we have strived to do is to deliver knowledge in a logical and consumable manner. There will be no sudden leaps from high-level descriptions into pages of mind boggling mathematical formula; this book strives to educate rather than to intimidate.

      So if you are ready, let’s get started.

      Chapter 1 – An Introduction to OTN

      The past decade (2005 to 2015) has seen unprecedented growth in bandwidth demand and consumption. Service providers' were caught-out initially as they struggled to adjust their capacity planning forecasts, based upon three year forecasts (master plans) and they had to re-engineer their networks to cope. This seemingly insatiable demand for consumer bandwidth was driven by the proliferation of mobile devices, such as internet capable smartphones and tablets. However, these devices were only technically feasible due to the advances in radio technology in the mobile telephony and Wi-Fi focused sectors of industry. Furthermore, the ubiquitous presence of these consumer owned devices proliferated into the workplace through initiatives such as BYOD (bring your own device). Consequently, there was a blurring of the workplace boundaries with regards not just to time but also to location. IT had then to facilitate the availability of business applications around the clock and from anywhere.

      This trend towards 'IP mobility' resulted in IT strategically shifting applications out onto the cloud. This initiative freed IT from the responsibility of supporting on-premises servers and providing troublesome internet connectivity with the required reliability, performance and quality. This dependence on IP mobility led naturally to embracing software as a service (SaaS) whereby the vendor took the responsibility of hosting the application in the cloud and delivering it as a web-based application, in real time and transparently to the customer.  

      These are only two of the disruptive technologies that have contributed to the vast growth in data consumption over the last few years. However, the data transport infrastructure does not have infinite capacity or the capability to handle such vast amounts of data. After all, there is only so much data a mobile operator can transport over their expensive and limited licensed radio spectrum, similarly the proliferation of Wi-Fi hot-spots, provides ubiquitous-access to consumer internet but that data has to be backhauled to some internet gateway. Additionally, outsourcing business applications to cloud service providers similarly shifts the burden of data delivery to the core backbone networks that interconnect all these diverse points of connectivity and this all requires transmission.

      The problem was that the existing transmission, the underlying pipes that carry our data around the globe, were already creaking and groaning under the existing load, so how could they be expected to cope?

      That was really a rhetorical question because we know now that the transmission providers shifted their emphasis from the well established and proven TDM (time division multiplexing) technologies to WDM, (wave division multiplexing) to address the shortage in capacity and transmission capability.  WDM proved to be a huge success and transmission rates soared from aggregated trunks and pipes of 2.5Gbps to single channels of 100Gbps in the span of only a few years

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