subject: Major Carriers To Build A Unified Integration Of Optical Transport Networks - Optical Network, Ngn, [print this page] Held in Beijing, from major domestic carriers, optical communication equipment manufacturers and experts in related fields, on the latest developments in optical communication technology and applications, and future development trend of the study carried out fully. In addition to FTTH access technology, optical transmission technology is a major focus of the General Assembly. Experts pointed out that the optical network as a basis for the network becomes increasingly important in recent years, along with IPoverWDM, OTN, ROADM, ASON, PTN and other technology, the core backbone optical networks are heading in the direction of the development of intelligent, next-generation optical transport network to .
Transmission platform to support the entire business forward
Currently, the trend of IP telecom networks more and more obvious to IP as the core of NGN, 3G networks will become the protagonist of the next stage. With data services and hosted IP-based voice services, IP networks carry not only the growing online business, but also as 3G, NGN, IPTV and large customer VPN bearer network. Therefore, the new era of IP bearer network must meet the exponential growth in bandwidth demand type, with carrier-class reliability and security, reduce network operators to build and operation and maintenance costs, maximize the use of fiber resources to support all business optical transport platform to become a general trend.
Meeting, IPoverWDM caused extensive discussions of all parties. Representatives have pointed out that with the optical path based shared protection, ROADM, intelligent EDFA, adaptive dispersion compensation, automatic optical power control, dynamic gain equalization of optical channel and a series of latest technology continues to mature, IP-based WDM transport network architectures have been gradually equipped to meet the requirements of carrier-grade mass transfer conditions, and in reliability, efficiency, flexibility has also increased gradually, flat structure and support for multi-service features become more prominent. At the meeting, ZTE to showcase its latest next-generation multi-service transport platform IPoverWDM. It is reported that ZTE's solutions support all business or data access and low-speed SDH service aggregation, multi-service convergence and enables efficient access bearer. By GSS (GeneralServiceSwitchPlatform) and ROADM (Reconfigurable OADM) combines greatly improved network scheduling flexibility to achieve any of various types of business-drop multiplexing. In addition, the smooth upgrade and intelligent network management flexibility to fully meet the business development.
Operators pay close attention to OTN / OTH maturity
Experts pointed out that, based on SDH and DWDM technology using fiber optic transmission network is the most important telecommunications network infrastructure, the delivery platform. The OTN-based transmission network will allow people to expect the emergence of intelligent optical network has gradually become a reality for network operators and customers safe, reliable, price efficient, customer related, manageable, workable and efficient next-generation optical transport platform .
According to reports, following the PDH, SDH and other digital transmission system, the recent ITU-T has defined the optical transmission system (OTH). OTH is a new standard for digital transmission architecture used in optical fiber transmission network, transmission through the appropriate adaptation of the payload, OTH support point to point, ring, lattice structure and other optical network operation and management. The broad concept of OTN and SDH technology similar in function, but the standard OTN rate and format have their own standards, defined as a series of OTN network elements interconnected by fiber optic link is made, the customer can provide the required layer transmission, multiplexing, routing, management, monitoring, and survivability features of the network. Experts believe that, as the early 90s from the 20th century began, the core network from the transmission network based on the evolution of PDH to SDH-based transport network, the core network from the current transmission network based on SDH to the future evolution of OTN-based transmission network is the transmission network an inevitable trend, and the smooth introduction of OTN and development depends largely on the introduction of a reasonable program and development strategy, which not only saves investment in network construction, and enable operators to maximize the business benefits.
Present, OTN commercial node devices has emerged, can achieve at least 2.5Gbit / s bandwidth, cross-particles, the business more transparent, and highly compatible, but currently crossover smaller capacity, and so far the construction of Most are based on SDH optical network (including the DWDM or CWDM SDH-based systems), customers on the SDH frame structure signal to send, so take time large-scale commercial OTN technology. The representative from China Netcom, although from the fully mature, large-scale commercial still some distance, but, all operators are closely watching the on OTN / OTH technology maturity of the product.
Experts concluded that the next step IPTV, 3G and other value-added business development, will lead to further escalation of optical networks. Currently, the industry that the ideal program of optical transport network should be intelligent IP layer architecture in intelligent optical layer directly above, through a unified control plane at all levels to achieve maximum efficiency of optical bandwidth scheduling. We must all technological developments, formulate a reasonable evolution of strategy. For example, gradually increase the network business dynamic intelligent scheduling, business protection and restoration and the ability to provide new services and toward greater granularity and packet-based intelligent direction, gradually introduced ODU cross and ROADM technology. In this process, the transfer level will gradually complete the upgrade and transformation of PTN direction, completely breaking the traditional transmission networks and the boundaries of two-story data network, building integrated, intelligent unified network.
