Analysis Parameters (18-0037) AM8a Instruction Manual
February 10, 2000 0037-S04.L_
4-6
4.9.1 FREQ%(max): When Tone Dialing is received, the Frequency of the Lo Band and the
Hi Band must not deviate more than this setting from the nominal Frequency. If the
percent of deviation (±) exceeds this setting, the Event is flagged as an error.
4.9.2 TWISTdB(min/max): When Tone Dialing is received, the difference (Twist) between the
Lo Band Level and the Hi Band Level of a digit must not exceed the range of this
parameter to be valid. If the difference exceeds this range, the Event is flagged as an
error.
4.9.3 DTMF Frequencies: There are 16 frequency combinations that represent the DTMF
(dual-tone multi-frequency, also referred to as "touch-tone®") digits that can be used.
1 - 9, *, 0, and # appear on a standard touch-tone dial (4 x 3 matrix).
The A, B, C, and D digits are used for inter-office dialing and other special
applications and may appear on some special-purpose dials (such as is used on the
AM8a Program Keyboard and the example below). The frequencies can be determined
from the figure below:
1
4
7
*
2
5
8
0
3
6
9
#
A
B
C
D
1209 1336 1477 1633
HIGH BAND FREQUENCY
697
770
852
941
L
O
W
B
A
N
D
F
R
E
Q
U
E
N
C
Example: DTMF digit 5 is made up of two frequencies. Reading to the right for Low
Band gives 770 Hz. Reading up for High Band gives 1336 Hz.
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