Basic principles of Huawei XEBD are as follows: Control module to complete the software board loading, operation control, management and other functions. The switching module implements aggregation and forwarding of eight 10G EPON port signals. The interface module implements the conversion of 10G EPON optical signals and Ethernet packets. The power supply module provides working power for each function module in the board. The clock module provides the working clock for each function module in the board.