User guide

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Chapter 5 - AT Commands
Sets the speed of tone dialing (spacing and tone duration times). The default value is 95 units
for domestic models and 80 units for Canadian and International models, where each unit is
one ms. In other words, for domestic modems, each tone is sustained for 95 ms followed by a
95 ms pause. The minimum S11 value allowed is 50 ms (50 units). The maximum S11 value is
150 ms (150 units).
S28 Enable / Disable V.34 Modulation
Unit: decimal
Range: 0, 1–255
Default:1 (enabled)
Enables or disables V.34 modulation. Setting S28 to zero (0) disables V.34 modulation. Any
other setting (1-255) enables V.34 modulation.
S35 Data Calling Tone
Unit: decimal
Range: 0–1
Default: 0 (disabled)
Enables or disables the V.25 data calling tone, which allows remote data, fax and voice
discrimination. Setting S35 to zero (0) disables V.25 data calling tone; setting S35 to 1 enables
data calling tone. The default setting is 1.
S37 Maximum Dial Line Rate
Unit: decimal
Range: 0–19
Default: 0
Sets the maximum dial line rate. When set to zero (0), the maximum dial line rate is the same
as the maximum modem speed. This is the most common setting and allows other modem
functions to actually determine the line rate used for each connection. It is the default.
Consider using S37 to set a maximum dial line rate if you need to artificially retain a lower
modem speed.
0 = maximum modem speed 13 = 19200 bps
1 = reserved 14= 21600 bps
2 = 1200/75 bps 15 = 2400 bps
3 = 300 bps 16 = 26400 bps
4 = reserved 17 = 28800 bps
5 = 1200 bps 18 = 31200 bps
6 = 2400 bps 19 = 33600 bps
7 = 4800 bps
8 = 7200 bps
9 = 9600 bps
10 = 12000 bps
11 = 14400 bps
12 = 16800 bps