Technical data

Each station measures the actual token rotation time and calculates the
difference between the target rotation time and the actual rotation time (=
token holding time). During this time, the station can transmit (first the
frames with high priority and then the frames with low priority). Once the
token holding time has elapsed, the token must be passed on.
If the transmitter has very little or no token holding time available, (Fig. 2.4)
it can only send one high priority frame before it is forced to pass on the
token.
Fig. 2.3 Distribution of the Target Rotation Time (1)
Fig. 2.4 Distribution of the Target Rotation Time (2)
B8976060/02 System Overview
2 - 13 Volume 1