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CHAPTER 4: AT Commands, S-Registers, and Result Codes
Register Unit Range Default Description
S35 decimal 0–1 0 0 disables, 1 enables the V.25
data calling tone, which allows
remote data/fax/voice
discrimination.
S36 decimal 0–7 7 Specifies the action to take if
negotiation fails when error
control is selected. (See S48.)
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 = 12,000 bps
11 = 14,400 bps
12 = 16,800 bps
13 = 19,200 bps
14 = 21,600 bps
15 = 24,000 bps
16 = 26,400 bps
17 = 28,800 bps
18 = 31,200 bps
19 = 33,600 bps