Abstract: A method and system including ATM switching equipment provided for switching between a working channel and a protection channel in an ATM network. The method and system include the following processes: In each cell for transmission providing an indication of whether the cell belongs connection currently in a working state via a working channel; cells are duplicated on each connection basis; the duplicated cells are transmitted simultaneously on both a working channel and a protection channel; and valid cells are selected from received cells according to the indication in each cell indicating whether the relevant connection is currently in a working state.

Abstract: The invention relates to a bandwidth control apparatus in ATM equipment, for inserting management cells such as OAM cells, the control apparatus being configured to secure a bandwidth for the insertion of a management cell such as an OAM cell when the need arises, while guaranteeing the service quality of user cells, thereby making effective use of network resources for a best effort service such as ABR or UBR.

Abstract: The first input route information with a virtual path identifier, a virtual channel identifier and a line identifier set in the header of an input cell is compressed, and a base address with a lower number of bits than the input route information is generated from a part of the second input route information selected by the compression using a first conversion table. Then, third data consisting of both the base address and a part of the second input route information other than the part of the second input route information selected by the compression are generated, and the third data are converted to a routing tag using a second conversion table.

Abstract: In a method of executing OAM processing in a plural-line terminating apparatus, a physical layer terminator converts a line signal to cells and adds a line identifier onto each cell header, the identifier specifying the line on which the cell arrived. A header converter converts a line-identifier/VPI/VCI of each cell to an identifier ICID for internal processing. An OAM processor unitarily manages data, which is necessary for OAM processing of each line, by a connection management table using the internal-processing identifier as an address, reads data from the management table based upon the ICID of the cells received from each of the lines, and executes OAM processing conforming to each line using the data that has been read.

Abstract: A call admission control system in an asynchronous transfer mode exchange includes a unit for describing attribute parameters of a cell from the subscriber terminal; a unit for calculating, based on the attribute parameters, the average and the dispersion of the traffic speeds of the call; a unit for managing data of the average and the dispersion on each output route and data relating to each subscriber; and a unit for calculating the total average and the total dispersion of the data speeds on the selection output route; and a unit for calculating prediction values of cell abandon rate and end-to-end delay based on the average and the dispersion on the selected output route calculated by the total average and dispersion calculating unit, and for comparing the prediction values with the required service quality of cell discard rate and end-to end delay, for determining whether or not the requesting call may be connected.

Abstract: A call admission control system in an asynchronous transfer mode exchange includes a unit for describing attribute parameters of a call from the subscriber terminal; a unit for calculating, based on the attribute parameters, the average and the dispersion of the traffic speeds of the call; a unit for managing data of the average and the dispersion on each output route and data relating to each subscriber; and a unit for calculating the total average and the total dispersion of the data speeds on the selected output route; and a unit for calculating prediction values of cell abandon rate and end-to-end delay based on the average and the dispersion on the selected output route calculated by the total average and dispersion calculating unit, and for comparing the prediction values with the required service quality of cell discard rate and end-to-end delay, for determining whether or not the requesting call may be connected.

Abstract: A self-routing switching system including a route setting unit (10) which receives transmission information and identification information given from incoming lines and forms, from the identification information, control information for setting a path to one outgoing line to which the transmission information is to be transferred, and a self-routing speech path (20) which can form a plurality of paths and which selects the most suitable one therefrom by the control information and autonomously guides the transmission information to the destination outgoing line.