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Voice Feature Guide 01

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Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document. Note: Even the most advanced machine translation cannot match the quality of professional translators. Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).
Signal Tone Test

Signal Tone Test

In a signal tone test, the system sends the signal tone signals to a specific port of a POTS board and makes the port loop back the signals, and then checks whether the loopback signals can be detected. This test function helps maintenance engineers check whether the system can normally process the detection of the user off-hook and signal tone and locate hardware faults related to the user off-hook and signal tone playing.

A signal tone test includes the following types, as listed in the following table.

Test Type

Requiring Coordination of Upper-Layer Device?

Busy tone test

The coordination of the upper-layer device is not required.

Ringback tone test

Dial tone test

The dial tone test and special dial tone test include the following modes.
  • out-of-service: In this mode, the test is performed on the device, which is independent of the upper-layer device. If the device is not connected to the upper-layer device, use this mode.
  • in-service: In this mode, the device coordinates with the upper-layer device to perform the test. The upper-layer device controls the playing of the dial tone or special dial tone.

Special dial tone test (that is, the dial tone test started by the device based on different service requirements, such as call forwarding-unconditional)

NOTE:
  • The POTS port supports local loopbacks.
  • The POTS port must be in the on-hook state during a signal tone test.
  • A signal tone test cannot be performed if the port is in the prohibit or loopback state.
  • A signal tone test cannot be performed when another test task (such as a POTS user circuit test, POTS user loop line test, call emulation test, search tone test, or POTS port loop test) is in progress.

Test Procedure

Figure 1-148 shows the test procedure of a signal tone test. As shown in Figure 1-148, the subscriber line interface circuit (SLIC) supplies feeding current to the telephone, sends voice frequency, generates ringing, detects off-hook signals and on-hook signals, and processes analog signals. The CODEC performs the conversion between analog signals and digital signals.
Figure 1-148 Test procedure of a signal tone test

  1. Maintenance engineers start a signal tone test on a POTS user port by using the CLI or NMS.
    • In test mode, run the pots signal-tone-test frameid/slotid/portid signal-tone busy-tone command to start a busy tone test.
    • In test mode, run the pots signal-tone-test frameid/slotid/portid signal-tone ringback-tonecommand to start a ringback tone test.
    • In test mode, run the pots signal-tone-test frameid/slotid/portid signal-tone dial-tonecommand to start a dial tone test.
    • In test mode, run the pots signal-tone-test frameid/slotid/portid signal-tone special-dial-tone command to start a special dial tone test.
  2. The DSP chip plays the signal tone.
    • For the busy tone test or ringback tone test, the device requests the DSP chip to issue the busy tone or ringback tone to the POTS port after the test is started.
    • For the dial tone test or special dial tone test:
      • If the test is started in out-of-service mode, the POTS port emulates the user off-hook. After the device detects the off-hook signal, it requests the DSP chip to issue the dial tone or special dial tone to the POTS port.
      • If the test is started in in-service mode, the POTS port emulates the user off-hook. After the device detects the off-hook signal, it reports the signal to the softswitch/IMS, and the softswitch/IMS requests the DSP chip to issue the dial tone or special dial tone to the POTS port.
        NOTE:
        You can start the test in in-service mode only after you have configured the users.
  3. The POTS board loops back the signal tone signals (as shown by the blue lines in Figure 1-148).
  4. If the DSP chip can detect the loopback signals, the system runs normally.
    If any exception occurs during the test, the following methods can be used for troubleshooting.

    Exception

    Troubleshooting Method

    No looped back signal is detected.

    • Run the display pstn state command to query the port status to check whether the port is faulty.
    • Run the display pstn state command to query the port status to check whether the port is busy.
    • Run the display dsp state command to query the DSP channel status to check whether the DSP resources are sufficient.

    The delay of the signal tone is too long.

    • Run the display cpu command to query the CPU usage to check whether the system is overloaded.
    • If the test is started in in-service mode, check whether the interaction between the device and the softswitch/IMS is delayed.
  5. (Optional) Stop a signal tone test.
    Run the pots signal-tone-test frameid/slotid/portid test-flag disable command to stop a signal tone test.
    NOTE:
    In a signal tone test, the duration of playing the signal tone needs to be set based on actual requirements.
    • If the preset duration does not expire, maintenance engineers can run this command to manually stop the test.
    • If the preset duration has expired, the system automatically stops the test.
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Updated: 2019-02-22

Document ID: EDOC1100067358

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