Maxim Integrated Teridian V.22 bis Linux Softmodem for 73M1822/73M1922 MicroDAA - Manual (Page 24)

V.22 bis Linux Softmodem for 73M1x22 MicroDAA User Guide UG_1x22_043
24 Rev. 1.5
Country support
S99 Preset Country Selection
0 CTR21
 1 USA / Canada
33 France
34 Spain
39 Italy
44 United Kingdom
49 Germany
61 Australia
81 Japan
86 China
886 Taiwan
82 S. Korea
S99 provides an easy way to set up the TSC Softmodem for different countries with a
single command. This command sets the dial tone and busy tone detection parameters as
well as the DTMF and pulse timing, DCIV settings, and AC impedance. Normally no other
commands are required to match a selected country’s requirements. Transmission levels
and detection threshold can be adjusted through other S registers compensate if your DAA
specifications require further changes.
Since the S99 register affects multiple registers, it should be set at the beginning of the AT
string, but never preceding the F command (i.e. ATFS99=1… is OK, but not ATS99=44F)
Originate functions
Dialing functions
S11 DTMF Ton/Toff Dialing Speed
n 20 – 211 in ms
 70 Ton = Toff = 70 ms
The S11 register sets the duration and spacing of touch-tones for tone dialing. (Setting this
value lower than 50 may produce inaccurate dialing.) This register does not affect pulse
dialing.
Country selection
dependent (S99)