In an internal combustion engine valve drive train switching arrangement with a switching unit, the switching unit includes at least two control structure arranged at adjacent ends of at least two switching devices of the actuating units and an actuating unit cooperating with at least one control track formed by the switching devices of the actuating unit. The card that supports the new protocol has a similar form factor to the legacy card, includes an indentation. 3, the application of air pressure is stopped to prevent an abnormal rise in pressure.