A method for buffering variable length data at a decoupler includes receiving, at a decoupler, a request to queue variable length data from a producer, with the decoupler comprising a management header and a buffer pool. The nitride semiconductor layer is formed of the same constituent elements of the semiconductor substrate. If performance of the first data lane increases vis-\xe0-vis the corresponding base performance measurement, the first set of remainder processor links is eliminated from the remainder processor links. This similarity measure is used to adapt the preset. Air is sucked by the fan so as to catch the punch scraps with punch-scrap separating device arranged on the upstream side of the air flowing direction of the fan so that the punch scraps are heaped within the punch scrap storage box.