Intelligent Optical Access Network Bandwidth Allocation And Control Management Technology Research

Nowadays, core network backbone has already achieved all of the optical cable communications, which greatly increased the system bandwidth. With video on demand, online games and the emergence of IPTV high-bandwidth services, the users'network bandwidth demand is also gradually increase, while the existing DSL-based broadband access method has been very difficult to meet the user bandwidth and the requirement of bi-directional transmission, and carry multi-service and other requirements. Faced with this dilemma, national telecom operators have to focus on the FTTH, FTTH is considered the future's broadband access technology, a typical representative one is the future "last mile" in its final form.With the triple-play services'integration, as well as VoIP, IPTV, VOD and other business in popularity, the current access network needs to support the ability to carry a variety of services and the need to provide greater bandwidth to the user. These different operations on the network delay, delay jitter, and QoS requirements are not the same, which makes access network business applications require different QoS, and give the different characteristics of different time delay, greatly increased the difficulty of network management, but also the need for network management and control are some of the more clearly defined. As the network and traffic scheduling and management needs of metro aggregation and access network level, will gradually evolve to intelligent, and ultimately the whole network intelligence. At present, the intelligent optical network research has focused on the core network, optical access network, and intelligent study of no precedent at home and abroad.This topic is based on National Natural Science Foundation project "Intelligent Optical Access key technologies" (60672025), an overview of the concept of intelligent optical access network, and some of the key technologies are described in detail; through building ONU platform for smart -based optical access network flow control and port traffic display function was achieved; In addition, for long-distance single-threaded mechanism of PON in the DBA's to bring the growth of packet delay, using a multi-threaded polling mechanism, and which The key issues were discussed in detail. Mainly involved the following tasks:1) Participation in National Natural Science Foundation key project: "Intelligent Optical Access key technology research", analyzes the development of passive optical networks, working principle, implementation method, a detailed description of an intelligent network access some of the key features.2) combine with WDM technology and access network's "high-capacity, low node" direction of development for long-distance PON in the network due to increased propagation delay and the increase in packet delay, the application of multi-threaded polling to replace the original single - Thread polling mechanism, and some of the key issues discussed.3) build ONU platform, ONU upstream port flow control and flow display function:Using Broadcom's BCM5338 chip, plus arm9 control panel to simulate the ONU function, use the BCM5338 chip, built-in VLAN feature to isolate the user MAC layer communication and Trunking functions to achieve convergence of user data functions, and the use of chip register port flow control to achieve the port traffic control functions.