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The highly integrated optical-layer board of Huawei OptiXtrans DC908 merges traditional optical-layer boards with a variety of functions. Taking the EMR8 board as an example, it integrates 5 different traditional boards into 1, which including 2*OAU, MUX/DEMUX, OSC, FIU boards. It can form an 8-wavelength optical-layer system with just one EMR8 board. So Huawei OptiXtrans DC908 greatly simplifies the configuration, fiber connection and can save the space.