Cisco Systems ATA 188, ATA 186 manual 5-33, 2 Cadence with Three On-Off Pairs, Sound, Silence

Chapter 5 Parameters and Defaults

Tone Configuration Parameters

•NumOfFreqs is the number of frequencies in the tone (1, 2, or 3). The frequencies can play simultaneously or sequentially, depending on the Sequential setting.

•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 5-2for 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 5-2for a graphical representation.)

Figure 5-2 Cadence with Three On-Off Pairs

Sound	OnTime_1		OnTime_2		OnTime_3
Silence
		OffTime_1		OffTime_2		OffTime_3

99267

•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.

Cisco ATA 186 and Cisco ATA 188 Analog Telephone Adaptor Administrator’s Guide for MGCP (version 3.0)

OL-4803-01 5-33