Abstract
With the development of transmission technologies, optical transport network (OTN) has evolved from a digital encapsulation technology to a network technology that supports multi-service transport. As the OTN gradually expands to the edge of the metropolitan area network (MAN) and enterprise users have higher quality requirements on bandwidth and service security, more and more private line services are provided via OTN network. Therefore, the OTN container is transformed from an optical data unit (ODU) to an optical service unit (OSU). The OTN industry has studied several OSU technologies to fit the development trends of NG OTN, aiming at transporting 2 Mbit/s to 100 Gbit/s constant bit rate (CBR) services and Ethernet services with high efficiency and more flexibilities, as well as reducing OTN network deployment and operation and maintenance (O&M) costs. In this work, several key technologies in NG OTN are introduced including NG OTN technical architecture, OSU frame format, client mapping and OSU multiplexing. Based on these technologies, we (China Mobile) took the lead in conducting the industry's first NG OTN test in Qingdao, which verified the service transport capability and lower latency performance of OSUs and promoted the maturity of the NG OTN industry chain.
Highlights
optical transport network (OTN) consists of a set of powerful technologies that offer high-speed traffic transport, network management and supervisory, and service grooming and switching
For OTN deployed on the backbone network and the core level of the metropolitan area network, the current data mapping solution based on optical data unit (ODUk) can achieve good bandwidth utilization since the bandwidth span of the carried services is relatively small
An optical payload unit (OPU) payload area is divided into a plurality of 66-bit units, and an optical service unit (OSU) frame format is constructed based on N of 66b code blocks
Summary
OTN consists of a set of powerful technologies that offer high-speed traffic transport, network management and supervisory, and service grooming and switching. With the rapid developments of enterprise services going on cloud and private lines, the requirements on service level agreement (SLA), secure and stable networking, and reasonable cost with fast service response are getting higher. This OSU-based technology can effectively carry private line services with high quality, and will meet different service transport requirements from various industry sectors like finance, energy, government, education, etc. We will first introduce the industry progress of the OSU-based NG OTN technology, and introduce our proposed technical enhancement and the first technical verification of this technology
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