Internet protocol - layer processor (ip) with a cell reception portion (11) for receiving an aal5 - frame including a plurality of atm - cells in each case by virtual channel connection (vcc), a cell decision section (12) for deciding whether a of the cell reception portion received atm - cell has a first cell of the aal5 - frame is, an ip - head extraction portion (13) for processing of the atm - cells and for extracting an ip - head from the atm - cell, the decision by the cell portion (12) was identified as the first cell, an ip - head processing section (32) for processing the by the ip - head extraction portion (13) extracted ip - head, and in order to generate a ip - head recording, a no frame buffer - write portion (14) for storing in a no frame buffer (33) of the atm - cells of the aal5 - frame, which by means of the ip - head extraction portion (13) and the ip - head processing section (32) has been processed, a transmission decision section (15) for deciding whether the aal5 - frame to a destination address is to be transferred or not, based on the ip - head recording, a no frame buffer - reading section (16) for reading of the atm - cells, which in the no frame buffer (33) are stored, if, because of the transmission of decision section (15) is decided that the aal5 - frame is to be transmitted,..
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