Toshiba TECRA A2 User Manual page 207

S37 Dial line rate
S37 = 0 (default)
S37 = 1
S37 = 2
S37 = 3
S37 = 4
S37 = 5
S37 = 6
S37 = 7
S37 = 8
S37 = 9
S37 = 10
S37 = 11
S37 = 12
S37 = 13
S37 = 14
S37 = 15
S37 = 16
S37 = 17
S37 = 18
S37 = 19
User's Manual
maximum modem speed
reserved
1200/75 bps
300 bps
reserved
1200 bps
2400 bps
4800 bps
7200 bps
9600 bps
12000 bps
14400 bps
16800 bps
19200 bps
21600 bps
24000 bps
26400 bps
28800 bps
31200 bps
33600 bps
S-registers
D-5