Karl Reichert wrote: > Hello, > > I read the paper "RTnet – A Flexible Hard Real-Time Networking Framework" at > http://www.rts.uni-hannover.de/rtnet/download/RTnet-ETFA05.pdf and I have a > question concerning chapter 3.2, formula 3. > > T_slot = T_sched + t_slot - t_offset > > As far as I understand this formula, the slaves calculate their own starting > point T_slot from T_sched (the planned transmission time of master), t_slot > (slot duration?) and t_offset (offset between master and slave clock). To my > mind, this doesn't makes any sence. Maybe I misunderstand one of the > variables, but let me give a small example: > > T_sched = 15 (absolute time point) > t_slot = 10 (duration) > t_offset = 20 > > Then, slave's starting point would be 15+10-20=5 > But how is it possible, if the master is the first one sending? I don't > understand this formula.
Oops, you stumbled over an impreciseness of the variables in that paper. They must read T_sched,master and T_slot,slave, i.e. the first one is related to the master view of time while the second one was transformed to the slave time base. Jan
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