Technical data

Calculation of the volume of frames and time required:
Type of frame Number Overheads from column 187,5
Kbps Table 17.13
Result
(in BTU)
Token 3 (stations) x 320 960
GAP 1 (GAP upd.) x 690 690
SDN 3 (SDN with 10
bytes transmitted
data)
x (450 + 10 (bytes) x 11 BTU) 1680
SRD 1 (SRD with 30
bytes transmitted
and received data)
x (610 + 30 (bytes) x 11 BTU) 940
The total is the "worst-case" target rotation time 4270
From this you can select the target rotation time:
4270 ("worst-case" target rotation time) x 0.6 (correction factor) =
2562
BTU
(target rotation time)
Optimizing the target rotation time:
➣ Assign the station addresses in ascending order
(1, 2, ..)
➣ The selected HSA should be the same as the highest station address
on the L2 bus.
B8976060/02 Appendix
17 - 29 Volume 1