A piston pressurized water filter activated by the user or external source. The inventive test strip includes a two-stage blood separation mechanism, including a first glass fiber matrix which separates most of the blood cells and an adjacent, second matrix preferably also containing glass fibers that separates the remainder of the blood cells. 05% by mass but less than 2% by mass relative to the resin mother particles. Each processing computer is configured to process the request data in a subsequent processing step, if the current value of the time tag falls within a respective significant value range. Delay information is calculated for the first and second network node on the basis of the arrival time information of the packet.