论文部分内容阅读
接入网(Access Network,AN)是国际上近年提出的一种新概念,被定义为本地交换机与用户端设备之间的实施系统,其目的是综合考虑本地交换局、用户环路和终端设备,通过有限的标准化接口将各种用户的需求接入业务节点。接入网的引入给通信网带来新的变革,使整个通信网络结构发生了根本的变化。由于受传输损耗、传输带宽及噪声等的限制和影响,传统的铜线接入网已越来越难以满足电信新业务发展的需求,并逐步成为宽带综合业务数字网的瓶颈所在。作为交换局与用户终端之间的连接纽带,接入网的数字化、宽带化成为当前电信网发展的焦点之一。随着电信技术发展的多样性,接入网的宽带接入技术也呈现了多种形态。其中为人们所熟识的主要宽带接入技术包括;光纤接入、无线接入、HFC、xDSL等。
Access Network (AN) is a new concept introduced recently in the world. It is defined as the implementation system between the local switch and the client device. Its purpose is to consider the local exchange, user loop and terminal device , Through a standardized interface to a limited variety of user needs access to business nodes. The introduction of access network brings new changes to the communication network, causing fundamental changes to the entire communication network structure. Due to the limitation and influence of transmission loss, transmission bandwidth and noise, the traditional copper access network has become increasingly difficult to meet the needs of the development of new telecommunications services and has gradually become the bottleneck of the broadband integrated services digital network. As the connecting link between the exchange office and the user terminal, the digitization and broadband access network become one of the focuses of the current development of the telecommunication network. With the development of telecommunication technology, there are many forms of broadband access technology in access networks. Among them, the most familiar broadband access technologies include fiber access, wireless access, HFC, xDSL and so on.