Method and device for extending functionality and performance of network access device

The invention relates to a device and a method for expanding function and performance of a line access card in a network access device, which adds a module such as an FPGA which can flexibly collocate function on the basis of a line access card in an existing network access device, collocates each functional module in an integrated circuit board as required by the user by adopting the methods such as software controlling, and ensures that the same line access card can meet different functional requirements and corresponding performance requirements.