OTN and IP Joint Optimization Group Network trend

Author: Our correspondent Chianglong this year, the operators of the transport network planning and deployment should be carried out in order to host the entire business as the goal, so as to adapt to voice services, data Services, multimedia services, such as the requirements of a variety of services to provide flexible, efficient and reliable bandwidth.　　Experts from China Mobile Research Institute believe that, in 2010, OTN as Backbone network technology, will be driven by the whole business to usher in more commercial opportunities. The standard for all-service bearer optical transport network (OTN), as a large capacity optical transmission technology, has become the core technology of the next Generation transmission network.　　But like all technology, from the birth of technology to the standard maturity, through a long period of research and discussion, in which China's operators and equipment vendors for the OTN technology and standards of maturity made outstanding contributions. Li Yu of China Mobile Research Institute believes that after the transformation of "All-optical transport network Architecture" to "electric layer management and Exchange", the OTN has already completed "take SDH business as the core" to "the whole business load-carrying" transformation.　　Driven by Chinese operators and manufacturers, the standardization of a series of technical solutions, such as ODU0, Odu3e2, Oduflex, high-order/low-order optical channel data Unit (HO/LOODU), General Mapping Protocol (GMP), has enabled OTN to meet the needs of multiple business hosting. OTN Standard earlier than the development of Ethernet-related standards, the early OTN positioning in the SDH service-oriented point-to-point transmission technology, therefore, OTN can not meet the requirements of Ethernet load. Experts point out that 2009, the biggest change of OTN standard is OTN reuse system, in order to adapt to multiple services, OTN introduced a new concept Hoodu and Loodu.　　The Loodu is equivalent to the business layer, which is suitable for different rates and different formats of the business, Hoodu equivalent to the tunnel layer, to provide a certain bandwidth transmission capabilities. Dynamic IP transfer is also an important demand of the whole business to the bearer network, and made remarkable progress in 2009. The application of ETH, FC, CPRI, Gpon and so on, so that the existing OTN container and traditional mapping method can not meet the demand of OTN full service.　　October 2009 Oduflex Program was formally accepted by ITU-T, Oduflex concept was first proposed by Huawei in 2007, Oduflex provides flexible and variable rate adaptation mechanism, so that OTN can efficiently carry the whole business including IP, and maximize the bandwidth utilization of the line. Combined with IP technology at present, the backbone of China's operators mainly divided into two layers: the IP network consisting of the core routers (including IP Internet and IP bearer network) and backbone optical transport network (optical layer, including SDH and WDM), IP is the main service object of optical transport network. However, over the years, the two layers have been independently developed, the relationship between them only focused on the optical layer for the IP layer to provide static configuration of the physical link resources, IP layer can not see the optical layer of the network topology and protection capabilities, the optical layer can not understand the IP layerDynamic Business connectivity requirements.　　Ministry of Industry experts Zhang Haiyi that the rapid development of the Internet and other data services led to a rapid growth of backbone network traffic, IP layer routers face huge expansion and processing pressure, resulting in its capacity, complexity and power consumption, backbone routers become the most expensive equipment in the network. Otn technology just can be combined with IP technology application, each exhibition director. The new generation of OTN is the optical networking technology adapted to IP service transmission, which can better transparently transmit 10GE, 40GE and even 100GE Ethernet services, not only improve the optical layer's business scheduling, network protection and intelligent control ability,　　After the integration of MPLS-TP technology, we can further realize the Ipoverotn of Joint network optimization, and realize the improvement of the utilization ratio and the reduction of the comprehensive cost.　　It is predicted that over the next 3-5 years, IP and OTN will be a dynamic, flexible and intelligent network in the form of a common load and transmission of multiple types, multiple granularity and multiple quality levels of the various integrated services, so as to achieve Ipoverotn joint optimization network. All levels can be introduced OTN on the 2010 Otn may be introduced from which network, this newspaper reporter interviewed the Ministry of Research experts. For long-distance backbone nodes, "at present, long distance backbone network carrying more and more business, flexible network scheduling and survivability problems are increasingly prominent, in long-distance backbone node to introduce super large capacity of OTN crossover equipment, can improve the quality of network operation, more efficient use of transmission network resources, improve the utilization of relay circuits.　　"After the introduction of OTN crossover devices, the business between the PE routers no longer through the core routers across the layer, but through the OTN device directly connected in the transport layer to complete the transfer, thereby saving the core router interface number and reduce its capacity requirements." The expert also pointed out that, for metropolitan area Network, the application of Otn is mainly in the way of combining metropolitan WDM.　　Because the OTN is positioned to provide the carrier of GE and above rate large particle business, there are two main applications of OTN in the backbone/convergence layer of the metropolitan Area Network, one is to carry the TDM and Ethernet dedicated line business of GE granule and above, the other is as the host network of IP, SDH and PTN. In addition, in the Access layer, the OTN devices applied in the access layer are mainly in the form of the box-type equipment and combined with CWDM. The Access Layer Otn in addition to the backbone/convergence layer of the business, currently considered two major applications, respectively, CPRI (public Wireless Interface Specification) Overotn and Ponoverotn.