Device and Method for Checking Switch Chip Failure in Asynchronous Transfer Mode Switch

摘要

In the present invention, when a plurality of switch chips are used in an asynchronous transmission mode, a failure occurring in one chip reduces the performance of the entire system. Since it is important to detect a failure quickly, the number of cells input to the switch structure An apparatus and method for comparing the number of output cells at each stage in a switch structure for each cell switching time and as a result finding fault conditions of each switch element in the switch structure.;According to an embodiment of the present invention, a switch chip failure checking apparatus and a method in a switch for both asynchronous transmissions are configured to extract address information from inputted headers of cells and attach internal routing tags to form a first stage. An input processor for transmitting to; A switch element for determining an output port and transmitting a cell to the corresponding port by referring to the corresponding routing tags; An output processor for converting the address information of the received cells into an address for use in the next switch and transmitting the changed address information Counters connected to each stage to digitize the number of cells passing through each stage; And a comparison circuit for comparing the values of the counter after transmission of all cells.;In a preferred embodiment of the switch chip failure checking method of the asynchronous transmission mode switch according to the present invention, the first element of the switch by extracting the address information from the header of the cells input from the input processor to attach the internal routing tag Transmitting to; The switch elements respectively determine the output port with reference to the corresponding routing tag and transmits the cell to the corresponding port; After the transmission of the cells, adding the number of cells transmitted for each row and storing the number of cells in each row counter; And each counter includes a process in which values are compared in a comparison circuit after transmission of all cells is completed.