Fujitsu Stylistic ST5000 Series Technical Reference Manual page 70

S38 56K Dial Line Rate
=0 56K disabled
=1 56K enabled - automatic speed selection - maximum
modem speed.
=2 32000 bits/s
=3 34000 bits/s
=4 36000 bits/s
=5 38000 bits/s
=6 40000 bits/s
=7 42000 bits/s
=8 44000 bits/s
=9 46000 bits/s
=10 48000 bits/s
=11 50000 bits/s
=12 52000 bits/s
=13 54000 bits/s
=14 56000 bits/s
S91 Line Transmit Level.
This register is effective only for Japan.
-dBm 14
S Register Table
9-15
66