MSR—一种新型宽带城域网技术（国外英文资料）.doc

MSR—一种新型宽带城域网技术（国外英文资料） MSR - a new type of broadband wans technology With the rapid development of IP technology, rapid changes in the structure of the telecom business also happening, IP business in exponentially in explosive growth in recent years, IP traffic over the next few years is expected to be more than voice volume become the dominant business of telecommunication networks. The traditional telecommunication network is designed for the transmission of voice, and the network of TDM and circuit switching technology is not suitable for transmitting IP data business and video. In order to adapt to the needs of future voice, data and video three meshes, it is necessary to build a broadband integrated metropolitan area network. This paper presents a simple introduction to several kinds of broadband wans. One, use POS + SDH/WDM technology Fiber optic communication is the first technology of the physical layer with its huge bandwidth. It is well known that the existing telecom backbone transmission network mainly USES SDH/SONET technology. SDH/SONET technology is suitable for the transmission of voice business using TDM technology, which has good network protection and self-healing capabilities. On the other hand, the current IP network relies heavily on telecommunications networks, such as telecommunications operators, to rent telecommunications lines. So the first solution for the broadband network is to use POS technology + SDH/WDM technology. The scheme adopts the SDH equipment or as a transport network, WDM equipment on high speed router USES the POS technology, high-speed router with SDH interface with related SDH equipment or WDM device is connected. The scheme is characterized by the ability to make full use of existing SDH and WDM devices in existing urban area networks to protect existing network investments. There are two types of POS currently defined by IETF adoption IP/PPP/HDLC/SDH structures, and the other is the itu-t x.85/y.1321 definition of the