Narchitecture of optical transport networks pdf

In the area of transport network architecture, a revised recommendation g. The project is an engineeringfocused effort led by major operators, technology vendors and research institutions. Extend your network to connect your other business locations or data centers in a metro area or long haul with our wavelength service. It is based on the network architecture defined in itu g. A comprehensive survey akhilesh thyagaturu, anu mercian, michael p.

Architectures and performance of optical packet switching nodes. Convergence of ipbased and optical transport networks. For carriers, this means significant cost savings compared to the cost of. According to different service requirements, fiberoptic cable availability and network resource allocations, ran real time and nonreal time resources can be deployed on the site or on the access cloud side. An optical transport network otn is an interconnection of optical switches and optical fiber links. 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. In the evolution of embedded core transport infrastructures or in building new core transport networks, efficient costeffective transport capacity expansion, network reliability, flexible and dynamic bandwidth management, and qualityassured service management are of paramount importance to service providers. Deploying wdm systems has allowed carriers to tap enormous capacity by carrying multiple wavelengths over a single fiber.

Fronthaul transport networks fronthaul transport nodes ftn carry cpri and ecpri traffic initially cpri and ecpri carried over separate wavelengths or fiber future. In many cases these networks, which have traditionally been based on synchronous optical network sonet or synchronous digital hierarchy sdh technology, are. In figure 3 and figure 4 respectively show examples of reference scenario and architecture of an optical internetwork. Traditionally, transport networks have often been fixed. The aim of the optical transport network otn is to combine the. 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. Cpri and ecpri carried over same wavelengthfiber necessitates radio over ethernet roeieee 1914. Comparing wavelengthswitched and digitallyswitched optical transport architectures. Synchronous digital hierarchy sdh columbia university. Otwg optical transport working group otn optical transport network oam operations, administration and maintenance mplstp mpls transport profile emsnms element network management system asongmpls automatic switched optical network generalized multiprotocol label switching sla service level agreement ne network element. Pdf sdn architecture for transport networks open networking. While many 4g assets can be reused, it will not be sufficient to overlay 5g on a 4g backhaul architecture, and even where an operator has deployed an advanced cran archi.

Architecture for autonomic optical transport networks ifip digital. The otn standards have been evolving within the itu since the early 90s, and most recently have. The standardisation of the layered architecture model for the optical networks described in itu g. The transport network considerations for 5g in cmcc. Most service providers would agree that current and future optical transport services can be most efficiently supported over optical transport network otn architecture. 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. This is what is known as optical transport network 6. The traditional access fiber architecture has been the fiber remote, which is a highspeed fiber trunk sonet or ethernet that terminates in an electro. The otn functionality is described from a network level viewpoint. Building a unified transport network to meet the transport requirements of various 5g services is a major challenge. This paper will discuss architecture and technology issues for the design of high performance optical data networks with two. It creates a transparent, hierarchical network designed for use on both wdmwson devices and tdm. With the evolution towards ipbased network, the circuit switched network is migrating towards a new architecture called next generation network ngn which emulates the behavior of circuit switching.

Abhinava sadasivarao, sanjoy bardhan, sharfuddin syed, biao lu and loukas. 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. Example of two controllers managing their respective physical nes. Their application is transport, so their primary concern is capacity. For large bandwidth and flexible forwarding demand, multilayer resource collaboration is required, l0l3 capability should be integrated at the same time. The most widely adopted layer 1layer 0 transport networking technologies today called as optical transport networks otn, are based on itut standards 1, 2. They help you stay competitive and turn your optical networks into platforms that create value for your business and your customers. And oduflex a futureproof solution for otn client mapping pdf. An open xhaul transport network the new 5g ran and enduser services requirements drive the need for a new transport network. This recommendation describes the functional architecture of optical transport networks otns using the modelling methodology described in itut g. At low transmission rates data can also be transferred via an electrical interface. Figure 2b shows the architecture of a colorless, directionless, and contentionless 4degree. 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.

The adoption of optical transport network otn technology continues to gain momentum in. Cran implications for fronthaul transport a cran architecture consist of three main components. Architectures and technologies for highspeed optical data. Optical transport network layered architecture for the moonet. Telecommunications network and service architectures. Request pdf architecture of an enhanced packetoptical transport system this. Our optical network products and solutions let you build smarter, more automated networks that streamline service delivery and lower network tco. Network requirements and architectural framework of the optical transport network family of recommenda tions. An one may retime, reamplify, reshape but it does not have to be 3r it can be purely photonic. Synchronous digital hierarchy sdh definition synchronous digital hierarchy sdh and synchronous optical network sonet refer to a group of fiberoptic transmission rates that can transport digital signals with different capacities. Architecture of an enhanced packetoptical transport system.

Otn is an industrystandard optical transport protocol itu g. Itut defines an optical transport network otn as a set of optical network. Dwdm deployment also came with a completely new set of network elements ne, including optical amplifiers, switches, multiplexers, demultiplexers, all of which introduced a sublayer into the network warranting constant monitoring to guarantee faultfree traffic. Dwdm optical network transport changed the traffic profile for the metro network of the future. Layered switch architectures for highcapacity optical transport networks article pdf available in ieee journal on selected areas in communications 167. Its bandwidth is substantial and the transmission distance can reach 5 km. Public consultation abstract the 5g architecture working group as part of the 5g ppp initiative is looking at capturing novel trends and key technological enablers for the realization of the 5g architecture. The role of optical networks optical network segments are categorized with respect to the size of the area they cover. Flexible architectures for optical transport nodes and networks.

They are also applied to the optical transport networks. The itus optical transport network otn, as defined by recommendation g. The optical transport network otn functionality is described from a network level viewpoint, taking into account an optical network layered structure, client. Optical transport network otn technology combines the advantages of optical transmission and electrical. They transmit bits using various encoding and multiplexing techniques. Contrary to previous works, we propose a more elaborate representation of the network state that reduces the level of knowledge abstraction required for drl agents and easily captures the singularities of network topologies. Longhaul core networks, also known as wide area networks wan or interchange carrier ixc public networks. Passive optical adddrop wdm networks have emerged but an optical data network that makes full use of the technologies of dynamic optical routing and switching exists only in experimental testbeds. Optical transport networks have been migrating from sonet technology to wdm architectures over the past 510 years. In this paper, we propose a drlbased solution for routing in optical transport networks otns. Paul goransson, chuck black, in software defined networks, 2014. Different issues related to the physical deployment in the access, metro and core networks of the 5g network are discussed in section 5 while in section 6 we present software. Draw architecture of optical transport networks otns and. The optical transport hierarchy oth is a new transport technology for the optical transport network otn developed by the itu.

This is a very simplified figure, as operations take place on an abstracted view of the physical resources, which has not been illustrated. Highly scalable, the network architecture can be modified or extended simply and quickly. It requires fewer or smaller technology rooms and therefore frees up space for users. Architecture of optical transport networks in force prepublished superseded and withdrawn components. Overview of optical networks the network as a cloud of information flows connecting different participants. Network planning and cost analysis for optical transport. This revision updated the otn architecurr to support the interfaces beyond 100 gbps i. Optical transport network an overview sciencedirect topics. Its optical mode gives it, moreover, a real security of the transmissions.

So far, the architecture proposed deals with the optical path network 6, which is characterised by the combination of wdm transmission and the wavelength. Overview this tutorial discusses synchronous transmission standards in world public telecommunications networks. In these approaches the wave length grid and channel. The optical transport network otn architecture is specified in itut rec. Both these classes of networks are connectionoriented and circuitswitched in nature. Osa routing in optical transport networks with deep. A comprehensive guide for professionals provides a single source reference of over a hundred standards and industry technical specifications for optical networks at all levels.