Access device for supporting variable data layer

An access device for supporting a variable data layer including first and second external networks, the access device comprising:

• a user access processing module unit connected to the first external network, wherein the user access processing module unit comprises:
• an analog access processing unit for processing an analog input data;
• a digital access processing unit for processing a digital input data;
• and a local area network access processing unit for communicating 10 Base-T physical layer data;
• 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 communicating with the second external network and having:
• a frame conversion processing unit connected to the second external network for receiving therefrom a signal and transforming the signal into ATM cells useable by the central control processing module, and wherein the digital access processing unit is connected to the frame conversion processing unit via a HPI bus;
• and
• a central control processing module unit connected to the user access processing module unit for processing data received from the first external network, wherein the central control processing module unit is connected to the frame conversion processing unit via a UTOPIA bus, and wherein the central control processing module unit comprises:
• a time division multiplexing switching unit for switching TDM buses used to communicate with the analog access processing unit and the digital access processing unit, a voice signal processed in the user access processing module unit being transmitted through the TDM buses;
• a voice processing unit for compressing the voice signal to be transmitted to the second external network, and restoring a compressed voice signal from the second external network according to control information from the processor module unit;
• and
• a processor module unit having:
• 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.