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当前，互联网上迅速增长的数据业务量对骨干网络的传输和处理能力提出了严峻的挑战。如果单从传输容量来看，通过采用密集波分复用（DWDM）点到点系统就应当可以满足传输方面的需求，DWDM系统能够使每根光纤上的数据传输速率达到每秒十几甚至是上百吉比特。然而，对网络节点（?
At present, the rapid growth of data traffic on the Internet poses a serious challenge to the transmission and processing capabilities of the backbone network. If only from the transmission capacity point of view, through the use of dense wavelength division multiplexing (DWDM) point-to-point system should be able to meet the transmission needs, DWDM system enables each fiber on the data transfer rate of more than a dozen or even One hundred gigabytes. However, the network node (?