| 摘要 |
The multiplexer comprises an input cell receiving unit for inputting a protocol cell data provided from a service data, i.e., ATM cell, and a layer controlling part, storing the cell data inputted to a corresponding connection point of an input buffer, and outputting state information of each input buffer, which is differently shown according to feature of the input cell data; an idle/non-assignment cell generating unit for generating a spare cell and a non-assignment cell in order to fill a cell stream of a bite unit corresponding to a STM-1 frame format and a transmission format of a cell environment when the data is not accumulated in the input buffer; a cell multiple controlling unit for inputting a specific information of the input data provided from the ATM layer controlling part and a state information outputted from the input cell receiving unit, and outputting one of control signals to be used for selecting either the cell data to be multiplexed, or the idle/non-assignment cell data; and a cell multiplexing unit inputting the control signal from the cell multiple controlling unit, and outputting multplexing data by abstracting the cell data of the input cell receiving unit and the idle/non-assignment cell data from the cell stream of the bite unit.
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