论文部分内容阅读
随着IP业务的爆炸式增长和我国电信运营市场的转型,无论是传统电信运营商还是新兴运营商,都把建设面向IP业务的电信基础网作为其网络建设重点。接入网承接用户与核心网,是宽带网络建设中非常重要的一环。接入网作为承载业务直接面向用户网络,是体现运营商的用户覆盖率和竞争实力的直接指标,同时也是电信网络的投资重点。从目前看,用户需求的多元化将给众多的接入网技术提供应用的舞台,同时我们也在不断呼唤有更新的接入技术出现,去满足更细分的用户需求,将通信网络的价值更加充分地体现出来。人们对带宽的追求是无止境的,因此接入网的改造和升级将是运营商长期需要面对的课题,并且需要处理好各种新技术和现有网络之间的关系。随着大客户业务的发展,以及运营商自有NGN等电信业务承载发展的需要,对IP接入网的各方面特性要求越来越高。接入网可以通过SDH的MSTP来解决业务接入,SDH环网的优点是高可靠性,满足用户的通信要求;能够提供保护和快速恢复机制;但是其点到点、电路交换的设计目标也为它带来了诸多缺点:1、带宽在节点间点到点的链路中固定分配并保留;2、带宽不能根据网络中流量的实际情况而改变,不利于带宽的高效利用;3、广播和组播报文将分成多个单播完成,浪费带宽;4、通常为实现保护机制,50%的带宽将保留,未能提供灵活的选择机制。因此,在这种情况下,我们需要有更好的技术来选择。接入网的接入技术包括多种方式,如物理线路直联、XDSL、MSTP、以太接入、RPR、FTTH、无线接入等方式。在业务路由器的各类接入技术中,用户也面临着选择,本文聚焦在以太接入网的相关环节,从几个热点接入网技术来阐述目前接入网的发展趋势。
With the explosive growth of IP services and the transformation of China’s telecom operation market, both traditional telecom operators and emerging operators regard the construction of a telecom infrastructure network for IP services as their network construction priority. Access network to undertake the user and the core network, broadband network construction is a very important part. Access network as a bearer service directly to the user network is a direct indicator of operator coverage and competitiveness of operators, but also the focus of investment in telecommunications networks. At present, diversification of user needs will provide a large number of access network technology to provide the application stage, and we are also constantly calling for newer access technologies appear to meet the needs of more subdivided users, the value of the communication network More fully reflected. People’s pursuit of bandwidth is endless. Therefore, the transformation and upgrading of access networks will be the long-term problems facing operators and the relationship between various new technologies and existing networks needs to be handled. With the development of large customer service and the carrier’s own development of telecom services such as NGN, operators are demanding more and more features in all aspects of the IP access network. The access network can solve the service access through the MSTP of SDH. The advantage of SDH ring network is high reliability, meeting user’s communication requirements; it can provide protection and fast recovery mechanism; however, its point-to-point, circuit-switched design goal It brings many shortcomings: 1, the bandwidth is fixedly allocated and reserved in the link between point to point; 2, the bandwidth can not be changed according to the actual situation of the traffic in the network, is not conducive to the efficient use of bandwidth; 3, broadcast And multicast packets will be divided into multiple unicast to complete, waste of bandwidth; 4, usually to achieve the protection mechanism, 50% of the bandwidth will be retained, failed to provide a flexible selection mechanism. Therefore, in this case, we need to have better technology to choose from. Access network access technology includes a variety of ways, such as direct physical line, XDSL, MSTP, Ethernet access, RPR, FTTH, wireless access and other means. In the various types of access technologies of service routers, users also face the choice. This article focuses on the related links of Ethernet access network, and expounds the development trend of current access network from several hot access network technologies.