Processing of time division multiplexed signal into ATM cells to decrease building time of each cell.

摘要

In a device for processing a time division multiplexed signal into asynchronous transfer mode cells, each comprising an information field, a single building unit (23) successively builds first through M-th cells (M: a plural and natural number) as the asynchronous transfer mode cells so that the information field of an m-th cell of the first through the M-th cells comprises first through N-th PCM signals (N: another plural and natural number) of an m-th frame of first through M-th frames of the time division multiplexed signal, where m consecutively varies from 1 to M. The first through the N-th PCM signals of the m-th frame are successively extracted from the time division multiplexed signal by an extracting unit (21). When the information field of each of the first through the M-th cells comprises first through N-th bytes and a prescribed number of remaining bytes, the building unit successively builds the first through the M-th cells so that the first through the N-th extracted signals of the m-th frame are placed in the first through the N-th bytes of the m-th cell, respectively, and that empty bytes are placed in the remaining bytes of the m-th cell.