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Apparatus and method for controlling traffic of atm user network interface

PURPOSE: An apparatus and method for controlling a traffic of an ATM(Asynchronous Transfer Mode) user network interface is provided to fixedly assign a VP(Virtual Path) according to a grade of a user and perform a traffic control according to a kind of a traffic of the user. CONSTITUTION: A CCB(Connection Control Block)(26) analyzes call setting request information from a plurality of user terminals, detects a class and QoS(Quality of Service) of a traffic and an address of a destination, controls connection admission, outputs information of a transmission bandwidth, assigns a VCI(Virtual Channel Identifier), and manages control information for a monitor function. A GFC(Generic Flow Control) analyzes information of a GFC function field located in a cell header, and performs a function for justly using a shared media used by a plurality of terminals and a function for minimizing a cell transmission delay. A TCB(Traffic Control Block)(32) responds to monitoring control information outputted from the CCB(26), monitors whether cells by the connection admission control of the GFC(18) observes concluded parameters, and notifies monitored information to the CCB(26). The TCB(32) controls a CLP(Cell Loss Priority) bit in a corresponding cell header and performs the transmission of cells, shaping, and cell cancellation according to the state of the CLP bit. A switch(34) connects to the TCB(32), and switches an inputted cell stream. A statistical multiplexer(36) connects between a B-NT1(Broadband-Network Termination 1) and the switch(34) through a physical layer, and replaces a VPI(Virtual Path Identifier) and the VCI using a routing look-up table.