A system for accessing and transmitting data frames of different types in a digital transmission network, including: at least one user-network interface; at least one network-network interface; at least one mapping/demapping device; a virtual interface device coupled with the at least one user-network interface and with the at least one network-network interface via the at least one mapping/demapping device; and a control device coupled with the virtual interface device; the control device including: a data processing and dispatching device including: at least one inter-device interface; a data processing and dispatching unit coupled with the inter-device interface; a processing flow database, storing a plurality of processing flows, coupled with the data processing and dispatching unit; and a control interface unit coupled with the processing flow database and the data processing and dispatching unit so as to control a virtual private processing unit and a rule database to process the data frames.