A stackable multi-port communication device for a packet-based data communication system, having a multiplicity of physical ports for the reception and dispatch of data in the form of packets, includes switch logic for selecting for a packet at least one destination selected from a multiplicity of ports which include a logical port common to a specified group of said physical ports. The device comprises a hardening device comprising at least to liquid cooling devices arranged next to each other and a transport device having rests for the rolling stock that can be moved across the entire hardening device. The pre-coding matrix is selected from a codebook defined for a second antenna configuration deployed in a non-scattering environment. The second plurality of dielectric breakdown voltages and lifetimes layer being determined utilizing the plurality of ramp rates for each of a second plurality of ONO layers having a particular control oxide layer thickness and a plurality of nitride layer thicknesses. At least one central drive is provided which drives the section for a conveying of the workpieces via a coupling. In one example, the DEGR cylinder may be deactivated prior to deactivating the non-DEGR cylinder group and stopping the engine, to purge EGR from the intake system.