Patent ID: 7072333

Claim:
An access device for supporting a variable data layer, the access device comprising: a user access processing module unit having an analog/digital access processing unit and a local area network access processing unit; a central control processing module unit connected to the user access processing module unit and having: a voice processing unit for compressing or restoring voice data to be processed in or inputted to the user access processing module unit; a time division multiplexing switching unit for performing voice data switching between the analog/digital access processing unit of the user access processing module unit and the voice processing unit; and a processor module unit for controlling the voice processing unit and the time division multiplexing switching unit, wherein the processor module further comprises: a CPU for forming the compressed voice signal, voice compression/restoring information and destination information as IP packets, when transmitting the voice signal to the 10 Base-T physical layer, extracting the compressed voice signal, voice compression/restoring information and destination information from the IP packet, when receiving the voice signal, dividing the IP packet into asynchronous transfer mode (ATM) cells for access to the second external network, or extracting the IP packet by re-combining the ATM cells; a memory for storing information processed by the CPU; a peripheral logic for defining an initial operation of the CPU; and a programmable logic device for performing interface between a Hewlett-Packard interface (HPI) bus and a universal test and operations physical interface for ATM (UTOPIA) bus; and a wide area network access processing module unit connected to the user access processing module unit and the central control processing module unit, the wide area network access processing module unit having: a frame conversion processing unit comprising a framer/deframer for transmitting/receiving ATM cells from the central control processing module unit through a first bus, and forming and extracting xDSL frames; an encoder/decoder unit for converting the xDSL frame into a signal usable in an external xDSL network, or the signal from the external xDSL network; and a physical access unit for performing physical layer access interface, wherein the analog/digital access processing unit is connected to the frame conversion processing unit via the HPI bus.