Firmware upgrade method for network device through digital subscriber line

Abstract

A firmware upgrade method for a network device through a digital subscriber line. First, the network device transmits a request to a dynamic host configuration protocol server through a digital subscriber line. Then, information comprising a file server address and a query message are transmitted from the dynamic host configuration protocol server through the digital subscriber line to the network device in response to the request. The network device determines whether to upgrade the firmware of the network device according to the answer of the query message. If the network device determines to upgrade the firmware thereof, updated information about the firmware is downloaded from a file server corresponding to the file server address. Finally, the firmware of the digital subscriber line device is upgraded according to the updated information.

Dependencies are inferred from the claim text.