Home > Technical Articles > OTN (Optical Transport network)
Introduction to OTN
Optical Transport Network (OTN) is the next-generation optical transport technology and is the most advanced digital subscriber line (DSL) component in service today. Optical fiber has the capacity to deliver substantial amounts of data along with other services such as video, telephone, and Internet access. The OTN has been specifically designed to take advantage of that capacity by enabling operators to offer new services and significantly increase their revenue while at the same time significantly improve operational efficiency. Optical Transport Network (OTN) technology provides a highly scalable, cost-effective transport infrastructure so essential to the growth of broadband networks. This course introduces advances in OTN technology and standards that provide better performance, greater efficiency and higher speed. Headend systems engineers and network operators will benefit from an understanding of the enhanced services that can be offered using these new technologies. Optical Transport Network (OTN) is a standardized layer in the Open System Interconnection (OSI) reference model that provides transparent transmission of user-data traffic (i.e. voice and multimedia services) over synchronous and asynchronous transfer blocks in a point-to-point connection across an optical domain.
Optical Transport Network (OTN) is a standard for propagating digital data via optical fiber. OTN decouples the physical layer between the media access control (MAC) and the transport layer in an IP network, allowing these layers to run on separate devices. This enables agile network operations and efficient network management. OTN is a standard developed by the ITU Telecommunication Standardization Sector, and is based on the synchronous transfer mode (STM) concept. OTN uses fiber-optic technology for transmission of multiplexed data, instead of copper (or other transmission media). It can handle traffic at up to 8.192Terabits per second (Tbit/s). Optical transport networks (OTN) are a specific type of telecommunications network. OTN can be used to connect an optical carrier level 3 (OC-3) [International Telecommunications Union (ITU-T) G.957] line to an access network, or to deliver the services over an interoffice trunk. The Optical Transport Network is the collection of interconnected fiber optic cables that carry signals from one location to another. OTN is designed to be scalable, meaning if you want more bandwidth or capacity in your network, you can simply add more fiber or drop more nodes. To save on cost and space, OTN is often deployed as a cloud-based service involving multiple locations as well as different carriers.
The optical transport network (OTN) is a passive, non-wavelength-division multiplexing network structure that connects several access rings to a common backbone ring or vice versa. OTN serves as the successor to SONET/SDH, which is one of the most widely deployed high-bit rate networks for long-distance communications over fiber optic media. An Optical Transport Network (OTN) is a Layer 1 network that is responsible for the transfer of optical signals through an inter-office, metropolitan or regional context. The OTN provides transport services over fibers or wavelength and provides resource reservation mechanisms. It builds on top of the Transmission Network (layer 2) providing solutions for Metropolitan Area Network circuits and for international long-haul networks. In fact, it is an extension of the SONET/SDH equipment concepts and contributes new functionality introducing some important advantages such as adaptive bit rate capabilities and improved survivability performance with specific functions like switching, restoration, and protection mechanisms. Optical Transport Networks (OTNs) are high-capacity, high-reliable networks that are used to transmit large volumes of data. OTN is designed and optimized for transmission of SONET signals over long distances and offers a number of benefits over other fiber optic transmission systems. The optical Transport Network (OTN) is a high-speed transmission network that uses optical signals for transmission and optical multiplexing for aggregation.
It is based on Synchronous Digital Hierarchy (SDH) and Synchronous Transport Module (STM). OTN equipment consists of switches, multiplexers/demultiplexers, add/drop multiplexers (ADMs), regenerators and other functions. OTN is an optical transport solution for Layer 1 and Layer 2 services. A Single Mode architecture allows for the transport of high quality signals over long distances, for example in metro systems or similar high-capacity networks. The need for constant connectivity and bandwidth means that organizations have to be responsive to the ever-changing needs of their customers. This means good network quality needs to be coupled with low latency and efficient use of resources. Optical transport network (OTN) is a flexible, reliable and cost-effective solution for the transmission of high-capacity signals beyond the reach of copper cables. It provides transport for various services, such as voice, video and data streams, which can be carried in either wavelength division multiplexing (WDM) or time division multiplexing formats.
OTN Frame structure
The Optical Transport Network frame structure consists of a sequence of various frames, each carrying data in its own payload. Each frame is identified by a header containing the source and destination information. There are two types of frames: data frames and control frames. Data frames carry user traffic while control frames carry management information related to Ethernet PHY management, OAM and protection switching management (such as LCAS) etc. Control frames are also used for communication between optical routers in transparent transport mode. The OTN frame structure defines the set of protocols and rules governing the formatting and transmission of information via optical networks. It comprises a hierarchy of payload, path, and subnetwork layers.
This framework offers a degree of flexibility in how signals are placed on the physical medium to accommodate different requirements for performance and transport characteristics. The OTN frame format consists of a superframe structure, made up of superframes and sub-superframes (S-SF). Within an S-SF, there are four timeslots that are 8ms long each. Each time slot can contain either a data frame or a maintenance frame. The OTN frame format is designed to transport several types of payload over OTN. The most common payloads to be transported are broadcast video, storage area network traffic, client workstation traffic and storage access network traffic. OTN frame containers are fixed length transport elements that are used to carry data traffic from one point to another. OTN has set standards for how the payload field is formatted, used and managed during transport. This feature allows OTN systems running at different speeds to efficiently inter-operate with each other through the use of multiplexing/de-multiplexing technologies implemented by OTN equipment components.
Optical Transport network OTN training and certification by TELCOMA Global
Optical Transport Network OTN training and certification by TELCOMA Global will help you understand the basics of Optical Transport Network, optical network architectures and various mechanisms used to transport. This course is designed for Engineers and Network Managers who want to learn about OTN technology and current trends in the industry.
OTN is an optical transport technology which forms the core of metro and regional networks, as well as high-capacity, long distance interconnection links. Optical Transport Network (OTN) Training and Certification by TELCOMA Global will help you understand how different layers work together to deliver data in a reliable, cost effective and secure way.
Optical Transport Networking training and certification (OTN) by TELCOMA Global is a online instructor-led class that provides participants with the fundamentals of Optical Transport Networks including the components, protocols, standards, and applications. This course covers topics such as OTN Layer 1 and 2 Signaling, SONET/SDH Architectural Models and Architectural Overview, OTN Physical Layer Concepts and SONET/SDH Framing in order to give you a comprehensive understanding of each layer within an Optical Transport Network.
OTN training and certification by TELCOMA Global will help you to earn a better job, enhance your skills and get promotion at work.
TELCOMA (Telecommunications Consultants & Management Asso.) is a global company which provides training, certification and professional skills in the field of telecommunications. Our courses are taught by experts from the industry who provide hands-on experience through practical lab sessions and theoretical study.
The Optical Transport Network (OTN) training course is designed to provide you with a solid understanding of the technical aspects of transport networking.
Website link for OTN courses: