ATM switching device and method capable of providing voice call service

An asynchronous transfer mode switching device comprising:

• input time switch modules connected to an input interface to switch channel data received over sub-highways to voice stream data grouped in accordance with destinations by sorting the received channel data according to time slots corresponding to numbers of destination time switch modules;
• input cell assembly and disassembly modules for assembling a group of voice data from the input time switch modules headed for the same destination into data cells;
• an input asynchronous transfer mode interface for interfacing the data cells received from one of an asynchronous transfer mode subscriber and an asynchronous transfer mode network;
• an asynchronous transfer mode switch connected to the input cell assembly and disassembly modules and the input asynchronous transfer mode interface for self-routing the data cells received from the input cell assembly and disassembly modules and the input asynchronous transfer mode interface, for switching the data cells, and for outputting the switched data cells to corresponding destinations;
• destination cell assembly and disassembly modules for disassembling switched data cells received from the asynchronous transfer mode switch into voice stream data;
• output time switch modules connected between the destination cell assembly and disassembly modules and a destination private switched telephone network interface to interchange time slots of the disassembled voice stream data according to destinations, and to output each of the time-slot interchanged voice stream data to a corresponding private switched telephone network interface;
• and
• an output asynchronous transfer mode interface for interfacing switched data cells received from the asynchronous transfer mode switch to one of a destination asynchronous transfer mode subscriber and a destination asynchronous transfer mode network.

An asynchronous transfer mode switching method for switching voice channels in an asynchronous transfer mode switching device, comprising the steps of:

• switching channel data to voice stream data grouped in accordance with destinations by sorting the received channel data according to time slots corresponding to numbers of destination time switch modules;
• assembling a group of voice data headed for the same destination into an identical data cell;
• self-routing the assembled data cell, switching the data cell, and outputting the switched data cell to a corresponding destination;
• disassembling the switched data cell into stream data;
• and
• interchanging time slots of the disassembled stream data according to destinations, and outputting each of the time-slot interchanged stream data to a corresponding destination interface.

An asynchronous transfer mode switching device for providing voice call service, comprising:

• input time switch modules connected to an input public switched telephone network for grouping received DS channel data according to same destinations, and for sorting the grouped DS channel data in time slots of a corresponding highway, thereby applying the sorted DS channel data according to said same destinations as an output;
• a cell assembly module for assembling said DS channel data grouped according to said same destinations for output by said input time switch modules into an asynchronous transfer mode cell;
• an input asynchronous transfer mode interface for interfacing asynchronous transfer mode cells received from an asynchronous transfer mode subscriber and an asynchronous transfer mode switching network;
• an asynchronous transfer mode switch connected to said cell assembly module and to said input asynchronous transfer mode interface for self-routing said asynchronous transfer mode cell for switching the asynchronous transfer mode cell, and for outputting the switched asynchronous cells to a corresponding destination;
• a cell disassembly module for inputting asynchronous transfer mode cells to be output to the input public switched telephone network switched in said asynchronous transfer mode switch, and for disassembling said asynchronous transfer mode cells into DS channel stream data so as to thereby output disassembled DS channel data to time slots of highways of destinations;
• output time switch modules connected between said cell disassembly modules and said input public switched telephone network interface for interchanging time slots of said disassembled DS channel data according to destinations, and for outputting time-slot interchanged voice stream data to the input public switched telephone network;
• and
• output asynchronous transfer mode interfaces connected between said asynchronous transfer mode switch, asynchronous transfer mode subscribers and an asynchronous transfer mode switch network for outputting an asynchronous transfer mode cell switched in said asynchronous transfer mode switch to a corresponding asynchronous transfer mode subscriber and a corresponding asynchronous transfer mode switch network.

An asynchronous transfer mode switching method for switching voice channels in an asynchronous transfer mode switching device, comprising the steps of:

• time switching channel data by sorting DS channel data received over each of a plurality of highways of an input public switched telephone network interface in time slots of said each highway headed for a same destination, and for grouping time slots of said DS channel stream data sorted according to said destinations based on time slots of highways corresponding to the destinations;
• assembling the grouped data into an asynchronous transfer mode cell so that said DS channel data grouped according to said same destinations is output to said same destination;
• self-routing said input asynchronous transfer mode cell, and switching self-routed data according to corresponding destinations, thereby outputting a switched result to an asynchronous transfer mode switching network;
• disassembling the asynchronous transfer mode cells grouped according to said destination into DS channel stream data, and outputting highways of the destination when receiving asynchronous transfer mode cells to be output to the input public switched telephone network received from said asynchronous transfer mode switching network;
• and
• switching time slots according to a destination of said disassembled DS channel stream data, and outputting a switched result to said input public switched telephone network interface.