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Cisco ATA 186 and Cisco ATA 188 Analog Telephone Adaptor Administrator’s Guide for H.323 (version 3.0)
OL-4804-01
Chapter 5 Parameters and Defaults
Tone Configuration Parameters
• TFreq1, TFreq2, and TFreq3 are the transformed frequencies of the first, second, and third
frequencies, respectively. Calculate each value with the following formula:
32767 * cos (2 * pi * F/8000)
where F is the desired frequency in Hz. Set this value to 0 if the frequency does not exist.
The range of each value is –32768 to 32767.
For negative values, use the 16-bit 2’s complement value. For example, enter –1 as 65535 or as
0xffff.
• Tamp1, Tamp2 and Tamp3 are the transformed amplitudes of the first, second and third frequencies,
respectively. Their values are calculated with the following formula:
32767 * A * sin(2*pi*F/8000)
A (amplitude factor) = 0.5 * 10^((k+10-(n-1)*3)/20)
where F is the desired frequency in Hz, k is the desired volume in dBm, and n is the number of
frequencies (If Sequential is set to 101, n is equal to 1). The ^ symbol means to the order of.
• NumOfOnOffPairs is the number of on-off pairs in the cadences of the tone (0, 1, 2, or 3). For a
steady tone, use 0.
If this value is 0, the OnTime1, OnTime2, OnTime 3, OffTime1, OffTime2, and OffTime3 values must
also be 0.
• OnTime1, OnTime2, and OnTime3 are the lengths of time that the first, second, and third on-off pairs
of a cadence play a sound, respectively. (See Figure 5-2 for a graphical representation.)
Specify each value as a number of samples with the sampling rate of 8 kHz. The range of each value
is 0 to 0xffff.
For example, for a length of 0.3 seconds, set a value to 2400.
• OffTime1, OffTime2, and OffTime3 are the lengths of silence after the sound of the first, second, and
third on-off pairs of a cadence, respectively.
Specify each value as a number of samples with the sampling rate of 8 kHz. The range of each value
is 0 to 0xffff.
For example, for a length of 0.3 seconds, set a value to 2400. (See Figure 5-2 for a graphical
representation.)
Figure 5-2 Cadence with Three On-Off Pairs
•
NumOfRepeats is the number of times that the first on-off pair of the cadence (specified by OnTime1,
OffTime1) repeats before the second on-off pair (specified by OnTime2, OffTime2) plays.
For example, if NumOfRepeats is 2, the first on-off pair will play three times (it will play once and
then repeat two times), then the second on-off pair will play.
• TotalToneTime is the total length of time that the tone plays. If this value is 0, the tone will play until
another call event stops the tone.
This value is in 10 ms units (100 ms = 1 second).
OnTime_3
OffTime_3
99267
OnTime_1
OffTime_1
OnTime_2
OffTime_2
S
ound
S
ilence