In order to transport network transition to full service broadband revolution

Broadband bearer all kinds of information application is becoming the business income of the main point of growth. Consumers hope that through mobile phone, computer and television screen whenever and wherever possible to enjoy every kind of integrated broadband services, namely the " full service broadband ". Due to the fierce competition, the bandwidth of the price is the rapid decline. Therefore, in the full service broadband consumer demand is excited at the same time, the operator facing data traffic growth is far greater than the business income growth of the enormous challenges. In the severe market environment, competitive, operators must reasonable planning, construction and operation of networks, including CAPEX ( by reducing network construction costs ) and OPEX ( network operation cost, total cost of ownership ) network, realize the full service broadband health development. Advance of optical transmission network has become one of the important measures of transition part. Full service broadband 3 changes Full service broadband to the operator brings out the 3 dimension change: First of all, the operator must face huge challenges to the network data throughput. Statistical data shows, the second quarter of 2009, the global mobile data bandwidth usage increased by nearly 30%, among them Asian growth at 36%. This also means that the rapidly increasing transmission bandwidth increased room and site operation cost, energy consumption. Therefore, operators must improve the data throughput per dollar, and ensure the lowest construction and operation cost, optimize the network, reduce the total cost of ownership. Secondly, the operator must be able to pass fixed and wireless network seamlessly provides various services. In fact, a full service broadband business users, hope to be able to seamlessly use fixed access or wireless access, from the Internet access to the same content and services. Once again, IP business, will promote the network leading the change of the type of business, from TDM to IP packet based transformation. IP networks can make the operator management cost is reduced, and effectively improve the quality of service and profit, has become a full service broadband operation foundation. Transmission network transformation Reasonable selection of equipment needs hierarchy Massive data, business integration and network IP based on optical transport network, raised new requirement, this expression is in: transmission technique choice and product definition should be able to effectively reduce the construction cost, and can simplify the maintenance management, reduce the OPEX; transport network must be able to adapt to the broadband services refers to the level of growth, to network transmission capacity expansion; transmission network can adapt to all kinds of business efficient bearing demand for bandwidth is provided, and a fast and flexible service scheduling; transmission network can meet a variety of business on the transport properties and QoS requirements, and efficient service protection and recovery. However, it is emphasized, transport network function is to provide for the long-term (based on month or year ) connection, and can provide for network fault service restoration. Operations of the IP and the " IP network ", does not mean that the network will use the traditional IP technology, does not mean that the transmission network by router network will be replaced, but the means that should choose to suit IP business efficient, economic and delivery methods. For the evolution of networks, different operators face the situation varies, depending on whether both wired and wireless network, it is a monopoly operators or new entrants, and policy control and operator organization structure. Relative to the router technology, studies have shown that: using hierarchical lower equipment networking, each down two layer, network TCO will be reduced by more than 30 times. In the particular port capacity, the lower layer device to replace the upper device network, will save CAPEX 3～ 7 times. However, greater savings from OPEX. This is because, first of all, the low layer network equipment, for the same capacity, the equipment used on the lower chip power requirements, the size of the device is substantially reduced, power consumption and air conditioning costs will be substantially reduced; second, the low layer equipment configuration and management of maintenance easier, so the maintenance staff technology level is low lower cost, maintenance, low layer device simplifies the operating means that configuration errors may occur in smaller, more easy to fault location and service recovery; in addition, the operator on the optical network equipment depreciation rate is less than the routing device. These are MSTP and Ethernet is still attractive factor. In certain circumstances, strengthening the routing node transfer function to reduce the optical transmission equipment investment is of great significance. It is mainly applied in the operation of new entrants to the market or small scale network ( enterprise network ), but when the expansion of network scale, equipment number up to hundreds of thousands, network total cost of ownership will benefit greatly from a reasonable level of equipment selection. To manage IP bearing evolution At present, in the transport network of metropolitan area level, operators are widely deployed SDH/MSTP. The advantage of SDH technology in network management, protection, at the same time with the economy. Based on the SDH MSTP will have a packet service capacity. However, SDH/MSTP VC based particle scheduling, limiting its bearing IP business efficiency, therefore, operators have begun to PTN evolution. However, although some operators have expressed to stop the SDH deployment, but considering the network continued evolution requires PTN and the mature market still remain time, MSTP will be in 3 to 5 years continue to be deployed and used. At the same time WDM system a large number of applications, and to enter into various levels of network deployment. Wave division multiplexing ( WDM ) extended fiber optic capacity, and reduce the optical fiber transmission cost, solve the scarcity of resources, by using the optical amplifier, single wave rate to 10G WDM transmission distance can reach 4000 kilometers. Along with the high-speed router port, 40G technology has been widely deployed; 100G is also actively promote, and is expected to in 2011 after beginning to mature. Most of the current deployed WDM system is a point-to-point network, based on reconfigurable optical add-drop multiplexing system ( ROADM ), WDM network can evolve into a mesh network, as the SDH in the original transmission network evolution process. From polycyclic to mesh can obtain 20%～ 30% cost savings, while the network deployment scenarios are also from long distance backbone network to the core, convergence and access network WDM network evolution, widely deployed that can better serve the router network, but can also network with You Bo wins business functions provide direct services, to achieve the simplified network level, saving TCO. IP business direct upload to WDM network will face networking, protection and maintenance management deficiencies. In view of this, a new generation of WDM system through the comprehensive support G.709 function, to achieve IP network and optical network maintenance and management as well as network protection system organic union, OTN will, to achieve IP network and optical network in transport plane uniform. The ASON/GMPLS control plane with reconfigurable ROADM has wavelength scheduling function can further enhance the business recovery ability and service deployment capability and resource management. Through further integration of ROADM and the introduction of OTN/ packet cross will generate new device type -- Based on packet optical transport platform ( POTP ). POTP capacity in hundreds of G to several T to support the fixed broadband and mobile data services in packet transmission, will play an important role in. In short, full service broadband era, in order to optimize the network life cycle cost, enhance the network control and management, network service oriented network flexibility and robustness will be transport network evolution of overall objectives and requirements, thus transmitting network evolution strategy not only focus on the promotion business processing hierarchy and Realization of IP routing, whereas the need from the point of business development and network continuity starting to develop based on network performance and cost ( TCO ) optimal overall development strategy and plan, to achieve the IP oriented economic, efficient, reliable and flexible transmission network.