Importance

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Abstract

When cells inputted from an incoming line (30) are demultiplexed cells for transmitting voice signals, a demultiplexer (31) extracts the signals from the cells and distributes the same to lines (33.sub.1 to 33.sub.n) corresponding to virtual channel identifiers of the cells, while distributing other cells to a line (33.sub.0) as such in other case. A multiplexed cell generator (35) reads a plurality of signals passing through FIFOs (34.sub.1 to 34.sub.n) in a cycle of 125 .mu.sec., and stores the same in an information field of a multiplexed cell. A demultiplexer (39) preferentially outputs the cell of the line (33.sub.0) to an outgoing line (310), while inserting a multiplexed cell passing through an FIFO (38) in a vacant cell caused in the line (33.sub.0) and outputting the same to the outgoing line (310). Thus, voice signals of a plurality of virtual channels are multiplexed in a transmission path on the outgoing line side, whereby waste of the band is reduced. It is possible to effectively use bands of a network in transmission of voice signals.

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First Claim