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Chapter 4 - AT Commands, S-Registers and Result Codes
Register Unit Range Default Description
S37 decimal 0–19 0 Sets the maximum V.34 “upstream” speed at
which the modem attempts to connect.
0 = maximum modem speed
1 = reserved
2 = 1200/75 bps
3 = 300 bps
4 = reserved
5 = 1200 bps
6 = 2400 bps
7 = 4800 bps
8 = 7200 bps
9 = 9600 bps
10 = 12000 bps
11 = 14400 bps
12 = 16800 bps
13 = 19200 bps
14 = 21600 bps
15 = 24000 bps
16 = 26400 bps
17 = 28800 bps
18 = 31200 bps
19 = 33600 bps
S38 decimal 0–23 1 Sets the maximum 56K “downstream” speed
at which the modem attempts to connect. The
default maximum speed is 56K bps.
V.90 Rates K56flex Rates
0 = V.90 disabled
1 = V.90 enabled*
2 = 28000 bps 2 = 32000 bps
3 = 29333 bps 3 = 34000 bps
4 = 30666 bps 4 = 36000 bps
5 = 32000 bps 5 = 38000 bps
6 = 33333 bps 6 = 40000 bps
7 = 34666 bps 7 = 42000 bps
8 = 36000 bps 8 = 44000 bps
9 = 37333 bps 9 = 46000 bps
10 = 38666 bps 10 = 48000 bps
11 = 40000 bps 11 = 50000 bps
12 = 41333 bps 12 = 52000 bps
13 = 42666 bps 13 = 54000 bps
14 = 44000 bps 14 = 56000 bps
15 = 45333 bps
16 = 46666 bps
17 = 48000 bps
18 = 49333 bps
19 = 50666 bps
20 = 52000 bps
21 = 53333 bps
22 = 54666 bps
23 = 56000 bps
* with automatic speed selection at maximum
modem speed
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