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随着宽带业务的发展,人们越来越意识到网络接入部分(最后一公里)存在严重的带宽“瓶颈”。接入部分两头目前已跨入吉比特级以上的速率,如用户端广泛使用的PC 内部传送的速率已达到吉比特速率:而作为接入部分的另一头,城域网或骨干网的每波长速率也已达到2.5～10 Gbit/s,它们比接入部分高出至少3个数量级。随着三网合一的推行,突破接入网瓶颈变得越来越
With the development of broadband services, people are increasingly realizing that there is serious bandwidth “bottleneck ” in the network access part (last mile). The rate at which the two access headers have now crossed the Gigabit level has been reached. For example, the rate of internal PC transfer, which is widely used by the client, has reached the Gigabit bit rate. On the other end of the access section, each wavelength of the metro or backbone The rate has also reached 2.5 ~ 10 Gbit / s, which is at least 3 orders of magnitude higher than the access part. With the implementation of triple play, breaking through the access bottleneck has become more and more