Patent ID: 7016979

Claim:
A method of accessing and transmitting data frames of different types in a system accessing a digital transmission network, said method processes the data frames, which enter the system via a user-network interface, via the following steps: performing a matching operation for the data frames according to classifying rules; modifying the data frames according to predefined classifying rules by inserting at least one data type number in at least one of said data frames; transferring the modified data frames to a data processing and dispatching device; searching for a processing unit corresponding to said at least one data type number in at least one of said data frames; transferring the data frames to said processing unit; determining whether said processing unit is a virtual interface device; if said processing unit is not a virtual interface device, then said data frames are processed by said processing unit; at least one data type number of said data frames is modified; said modified data frames are transferred to said data processing and dispatching device; and said system loops back to the step of searching for the processing unit corresponding to said at least one data type number in said data frames, and searching for the processing unit again; and if said processing unit is a virtual interface device, then said virtual interface device is employed to find a corresponding device interface according to said at least one data type number in the data frames; said virtual interface device modifies the data frames by deleting said at least one data type number from the data frames; and said virtual interface device transfers the modified data frames to said corresponding device interface in order to output the modified data frames via said interface.