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TONE-PT (Tone Generator)
Issue 1 June 2005 2357
Tone Generator Transmission Test (#40)
The purpose of this test is to verify that the tone generation hardware on the IPSI or Tone-Clock
circuit pack is capable of generating a subset of system tones and a set of test tones. This test
does not verify all system tones the tone generator produces during normal system operation.
The test is performed in two parts. For the first part, the Tone Generator is told to generate the
touch-tone digits. The digits are received and checked by a Tone Detector’s touch-tone
detector. If any of the digits fail, the test is repeated using a touch-tone detector in another Tone
Detector circuit pack.
For the second part, the Tone Generator is told to generate call-progress tones that are
detected and identified by a tone detector. These tones are:
● 440 Hz
● 2225 Hz
● Digital Count
The tone generator is then told to generate a sequence of test tones whose output levels are
measured by a tone detector. These tones are:
● 404 Hz at 0 dB
● 1004 Hz at -16 dB
● 1004 Hz at 0 dB
● 2804 Hz at 0 dB
A Tone Detector’s general-purpose tone detector listens for tones and measures their quality. If
any of the measured values are not within limits, the test is repeated using a general-purpose
tone detector in a different Tone Detector circuit pack. If the values are still out of the limits, the
test will fail.
For every failure case of Test #40, do the following:
1. Check that all Tone Detector circuit packs have the same companding mode as that
administered for the system. Correct the situation if there is a mismatch.
2. Run the long test sequence: test tone-clock location l r 1.
3. If the problem persists, replace the IPSI or Tone-Clock circuit pack by following the steps
outlined in Replacing the IPSI or Tone-Clock Circuit Pack
on page 2337.