Dtmf / twist dial register – Maxim Integrated Teridian V.22 bis Linux Softmodem for 73M1822/73M1922 MicroDAA User Manual
Page 25
UG_1x22_043
V.22 bis Linux Softmodem for 73M1x22 MicroDAA User Guide
Rev. 1.5
25
S12
DTMF / Twist Dial Register
32
D digit selected, 2dB twist.
Selects the digit to be dialed as well as the desired twist between the low and the high
frequency. For normal operation, only the twist needs to be set once. The digit will be filled
automatically. For test operation, both the twist and the digit must be filled. See J
command.
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
N/A
Twist 2
Twist 1
Twist 0
DTMF3
DTMF2
DTMF1
DTMF0
DTMF3
DTMF2
DTMF1
DTMF0
Digit
Low tone High Tone
0
0
0
0
D
941
1633
0
0
0
1
1
697
1209
0
0
1
0
2
697
1336
0
0
1
1
3
697
1477
0
1
0
0
4
770
1209
0
1
0
1
5
770
1336
0
1
1
0
6
770
1477
0
1
1
1
7
852
1209
1
0
0
0
8
852
1336
1
0
0
1
9
852
1477
1
0
1
0
0
941
1336
1
0
1
1
*
941
1209
1
1
0
0
#
941
1477
1
1
0
1
A
697
1633
1
1
1
0
B
770
1633
1
1
1
1
C
852
1633
Twist2
Twist1
Twist0
Relative level
0
0
0
No twist, 0 dB nominal.
0
0
1
low frequency 1 dB below the high frequency tone.
0
1
0
low frequency 2 dB below the high frequency tone.
0
1
1
low frequency 3 dB below the high frequency tone.
1
0
0
low frequency 4 dB below the high frequency tone.
1
0
1
low frequency 5 dB below the high frequency tone.
1
1
0
low frequency 6 dB below the high frequency tone.
1
1
1
low frequency 7 dB below the high frequency tone.