Optical transport network architecture pdf

This paper presents the time shared optical network tson as metro mesh network architecture for guaranteed, statisticallymultiplexed services. The optical layer provides lightpaths to other layers such as the sonetsdh, ipmpls, and ethernet layers, as well as the electronic layer of the optical transport network otn, which includes the the optical channel transport unit otu and optical channel data unit odu sublayers see section 6. A set of optical network elements connected by optical fiber links, able to provide functionality of transport, multiplexing, switching, management, supervision and survivability of optical channels carrying client signals. Optical transport network otn is a protocol for sending network messaging over optical fiber networks. Architecture of optical transport networks in force prepublished superseded and withdrawn components. The itus optical transport network otn recommendation provides a networkwide framework that truly delivers on the carrier requirements for reduced costs, greater flexibility, and increased efficiencies. Optical transport networks training tutorial course.

Optical network segments are categorized with respect to the size of the area they cover. Most optical transport nes are equipped with embedded. It is based on the network architecture defined in itu g. Bus topology figure below shows a generalised bus topology network. Optical transport network market growth, trends, and. Paul goransson, chuck black, in software defined networks, 2014. To support these new applications in an efficient manner, the underlying mobile transport. Optical transport networks training otn training course. The role of optical networks optical network segments are categorized with respect to the size of the area they cover.

A point to note, however, is that currently no management capabilities exist for dealing with optical signals that have not been converted to digital format. Fiber capacity the first implementation of what has emerged as the optical network began on routes that were fiber limited. Experts define otn as a collection of optical network elements one that communicate using wavelength division multiplexing wdm. Optical transport networks training by tonex provides a comprehensive technical introduction to optical transport networks. Abstract data center networks dcns form the backbone in. Itut defines an optical transport network otn as a set of optical network elements one connected by optical fiber links, able to provide functionality of transport, multiplexing, switching, management, supervision and survivability of optical channels carrying client signals. Simple optical network architectures broadcast and distribution networks. Transport operational model addresses growth in packet traffic and services service flexibility p2p private lines, video transport, multipoint, best effort traffic as wells as legacy services sonetsdh like sla and oam with granular bw provisioning high network utilization of transport network. Convergence of ipbased and optical transport networks. Network slicing cn, policy vnf cn, policy vnf cn, policy vnf 2g, 3g, 4g slice nbiot, ltem slice wifi slice fixed line slice vnf vcpe interorchestration system interface potentially multiple other network slices per network customer one or more 5g slice per enterprise customer mec ran, cn.

Make your network efficient by using the same optical transport platform for every application, fiber type, and reach. Example of two controllers managing their respective physical nes. The ipmpls routers peer with each other via the layer 1 and layer 0 optical underlay. Transport network requirements and architecture for 5g.

Fractions of the optical power on the bus aretapped off to provide a signal to each subscriber. Interdomain interface irdi intradomain interface iadi. Software defined networking is a new architecture that has been designed to enable more agile and. Overview of optical networks the network as a cloud of information flows connecting different participants. The otn standards have been evolving within the itu since the early 90s, and most recently have been completely revised with respect to a standards. Telecommunications industry and service provider networks must quickly. A few of the most important reasons for migrating to the optical layer are described in this module. Ori gerstel, masahiko jinno, in optical fiber telecommunications sixth edition, 20. A demonstration usecase of an openflowenabled optical virtual switch implementation managing a small optical transport network for. Attribute tdm transport packet data network connection mode connection oriented connectionless except te oam inband oam outofband except pw, te protection switching data plane switching control plane dependency bw efficiency fixed bandwidth statistical multiplexing data rate granularity rigid sonet hierarchy flexible data rate qos one class. The adoption of optical transport network otn technology continues to gain momentum.

It delivers guaranteed subwavelength and multigranular network services. Although much of the infrastructure in your optical transport networks is working, and innovations continue, major problems within your legacy sonetsdh network architecture have become a significant barrier to business growth. Optical network terminology sonetsdh synchronous optical network later called synchronous digital hierarchy this standard defines a synchronous frame structure for transmitting time division multiplexed signals. Optical transport network otn is a series of standards created to combine the benefits of sonetsdh with the bandwidthexpanding capabilities of dense wave division multiplexing dwdm in order to build more network functionality into optical networks. This paper proposes an architecture for software defined optical transport networks.

Otn facilitates efficient use of dwdm capacity by ensuring consistent fill rates across a network using otn switches at fiber junctions. Network architecture for optical path transport networks. White paper open optical transformation introduction navigating the transition from todays proprietary optical networks towards an open, automated network architecture is now within the reach of service providers. Draw architecture of optical transport networks otns and. Extend your network to connect your other business locations or data centers in a metro area or long haul with our wavelength service. We note that 80 percent of delay on the transport network depends on the fiber distance, so shortening the distance between the core network and the user is the best way to reduce delay. With multiple clients transported on a single wavelength, otn provides an economical mechanism to fill optical network wavelengths. Therefore, in this paper, we exploit different optical transport network architectures and technologies that can be used to build an efficient fronthaul network for 5g, in order to carry data. Looking for network architecture that will enable you to migrate from a circuitswitched transport network to a futureproof packetbased network. With the advancements in internet of things iot and machinetomachine m2m communications, a substantial amount of data is expected to be generated. Northwestern university, yuiuc, znec labs america, inc. A roadmap for transport network modernization cisco.

Opticalnetwork drivers many factors are driving the need for optical networks. Issue on packet networking 1 described a new datacentric optical transport network architecture. Jun 12, 2012 comparing wavelengthswitched and digitallyswitched optical transport architectures. The optical transport network otn is evolving fast a transformation, in fact, that renders the term. The optical transport network architecture as specified in itut g. Optical network drivers many factors are driving the need for optical networks. The optical transport network otn standards, defined by the itut g. Stmxx synchronous transfer module each bit rate is a multiple of the lowest level oc1 or stm1.

An optical switching architecture for data center networks with unprecedented flexibility kai chen. Dec 12, 2018 5g brings the promise of new applications enabled by lowlatency and 10x higher wireless connectivity. Network requirements and architectural framework of the optical transport network family of recommenda tions. Comparing wavelengthswitched and digitallyswitched optical transport architectures. The rise of open standards, apis and opensource reference platforms has accelerated innovation to drive more. Dwdm network designs and engineering solutions is truly one of its kind. They transmit bits using various encoding and multiplexing techniques. The bus is a high bandwidth optical fibre which traverses the entire distribution area. At low transmission rates data can also be transferred via an electrical interface. Gigabit passive optical network gpon tdm architecture, 2. The ipmplsethernet client traffic transit through a series of such optical transport network elements ne in the endtoend path. In contrast to the transparent network, the opaque network performs a 3r regeneration at each node in the network. This is a very simplified figure, as operations take place on an abstracted view of the physical resources, which has not been illustrated. Optical transport network an overview sciencedirect topics.

The otn standards have been evolving within the itu since the early 90s, and most recently have been completely revised with respect to a standardsbased transport for carrier. Comparison of network topologies for optical fiber. It provides very exhaustive and meticulous coverage of all aspects of dwdm technology ranging from the simplest of concepts in optical networking to the different intricacies involved in designing cost effective and efficient networks. The optical transport hierarchy oth is a new transport technology for the optical transport network otn developed by the itu.

Optical transport network otn primer searchnetworking. Contents iv introduction to dwdm technology ol088401 optical fibers 26 how fiber works 26 multimode and singlemode fiber 27 singlemode fiber designs 28 transmission challenges 29 attenuation 29 dispersion 210 summary 212 light sources and detectors 2 light emittersleds and lasers 2 itu grid 214 light detectors 215 optical amplifiers 216. The delay of devices on the transport network matters when congestion occurs. The optical path network will play a key role in the development of the transport network that will realize the bandwidthabundant bisdn. In the area of transport network architecture, a revised recommendation g. The modern network architectural choices typically boil down to ip. There are multiple options on functional split how the ran can be disaggregated into.

Index terms wdm, traffic grooming, otn switching i. The promise of the optical transport network otn is designed to address these issues by delivering a transparent framework to efficiently carry diverse traffic types. In figure 3 and figure 4 respectively show examples of reference scenario and architecture of an optical internetwork. This revision updated the otn architecurr to support the interfaces beyond 100 gbps i. The optical transport network market was valued at usd 23. Pdf this paper presents a roadmap of progress in the area of optical. As illustrated in figure 1, a data center contains a number of servers, where the applications are hosted. Optical transport network design course onsite training.

We also simplify optical networking with a unified management system and a resilient, multilayer control plane. Pdf roadmap on optical transport network technologies. Network planning and cost analysis for optical transport. This optical transport network otn primer tells you about the itu standards designed to build more network functionality into optical networks and how traditional carriers and content providers are using this architecture.

Figure 1 data center interconnect, alloptical network. Optical transport networks are composed of a set of optical network elements connected by optical fibre links to provide functionality of transport, multiplexing, routing, management, supervision and survivability of optical channels carrying. Optical transport networks training course handson. Our 1830 photonic service switch meets all your optical transport needs. Optical transport use cases optical transport working group. Pointtomultipoint, fiber to the premises network architecture in which unpowered optical splitters are used to enable a single optical fiber to serve multiple premises, typically 16128. A pon consists of an optical line terminal olt at the service providers central office and a number of optical network units onus near end users. Disaster recovery from customer premise disaster recovery solutions for customer premises or that of any thirdparty provider, minimize downtime and deliver costeffective levels of resiliency for mission. Optical transport use cases open networking foundation.

As defined by the international telecommunication union itu, otn is a set of optical network elements. Introduction to dwdm technology ol088401 optical fibers 26 how fiber works 26 multimode and singlemode fiber 27 singlemode fiber designs 28 transmission challenges 29 attenuation 29 dispersion 210 summary 212 light sources and detectors 2 light emittersleds and lasers 2 itu grid 214 light detectors 215 optical amplifiers 216. Otn was designed to provide support for optical networking using wavelengthdivision multiplexing wdm unlike its predecessor sonetsdh itut recommendation g. Introduction the main goal of the thesis one presents in the following paper is to plan and analyze optical transport networks with wdm systems operating at 100 gbps per optical channel to. A practical vision for optical transport networking electrical and. Most service providers would agree that current and future optical transport services can be most efficiently supported over optical transport network otn architecture. Optical transport networks are composed of a set of optical network elements connected by optical fibre links to provide functionality of transport, multiplexing, routing, management, supervision and survivability of optical channels carrying client signals. Otn is an industrystandard optical transport protocol itu g.

An one may retime, reamplify, reshape but it does not have to be 3r it can be purely photonic. Digital signal processing dsp is used to mitigate transmission impairments and. The sdn controller includes a network abstraction layer allowing the implementation of cognitive controls and. This paper proposes a new layered transport network architecture on which the wdm optical path network can be effectively created.

Also commonly called digital wrapper, otnor optical transport networking is a nextgeneration, industrystandard protocol that provides an efficient and globally accepted way to multiplex different services onto optical light paths. Network architecture for optical path transport networks abstract. Longhaul core networks, also known as wide area networks wan or interchange carrier ixc public networks. The cisco network convergence system 4200 series delivers bestinclass circuit emulation, optical transport network, and carrier ethernet capabilities. Tson proposes a flexible and tunable timewavelength assignment along with oneway treebased reservation and node architecture. Pdf an optical sdn controller for transport network. Synchronous optical networking sonet and synchronous digital hierarchy sdh are standardized protocols that transfer multiple digital bit streams synchronously over optical fiber using lasers or highly coherent light from lightemitting diodes leds. An optical transport network otn is an interconnection of optical switches and optical fiber links. Often, operators attempt to address the capexopex quest by converging a number of functions onto a single network element.