The invention relates to a rapid recovery shock absorber system with hydraulic end stop, comprising a stem and a body, in which a piston runs which is fixed to a tube and which defines at least one upper chamber and one lower chamber in the body. The valid bit may be qualified in a decode stage in response to receiving a stall signal andor a kill signal. One port of the 1394 interface card to be tested and one port of the reference 1394 interface card are in enabled condition and the others are in disabled condition.