IBM MOBILE COMBO ADAPTER PRO/100 SP - Manual (Page 39)

S38=3 34 kbit/s
S38=4 36 kbit/s
S38=5 38 kbit/s
S38=6 40 kbit/s
S38=7 42 kbit/s
S38=8 44 kbit/s
S38=9 46 kbit/s
S38=10 48 kbit/s
S38=11 50 kbit/s
S38=12 52 kbit/s
S38=13 54 kbit/s
S38=14 56 kbit/s
The number of robbed-bit signaling (RBS) frames detected decreases the true
DCE rate per the following table:
Table 6: Effect of RBS Frames on DCE Rate
RBS Links Rate Hit (kbit/s)
0 0
1 2
2 4
3 4
4 6
5 8
6 8
For example, if S38=10 and there are 3 RBS links, the K56flex downstream rate
will be 48-4=44 kbit/s. The exception to this is for 32 kbit/s and 34 kbit/s,
which are the true rates regardless of the number of RBS frames detected.
Appendix B. Modem function B-13