Performing Calibration for an MLC 8000 Subsite Link Converter

Prerequisites:

When and where to use:

Use this procedure to calibrate input signal to get the optimum signal level for an analog or mixed-mode system.

Procedure:

  1. If an incorrect channel cluster (not the one to which the MLC 8000 Analog Subsite Link Converter port you want to calibrate belongs) is displayed on the MLC 8000 Configuration Tool main screen, close it by clicking Channel Cluster → Close. Click Channel Cluster → Open. From the pop-up window that appears, select the correct channel cluster to open. Click OK.
    The correct channel cluster opens and appears on the MLC 8000 Configuration Tool main screen.
  2. Select the MLC 8000 Subsite Link Converter you want to calibrate by clicking it in the channel cluster tree. Click Configure Device.
    The Modify Device Configuration window appears.
  3. If the BR/Console Properties tab fields are not already displayed, click BR/Console Properties.
    The BR/Console Properties fields appear.
  4. Select the port on which you want to modify the input level differential by clicking it in the Port field and then click Advanced.
    NoteFor IP simulcast, only port number 4 can be configured.
    The BR Advanced Configuration window for the selected port displays.
  5. In the Input Level Differential (dB) field, set an appropriate value to ensure that it matches the output configured at the base radio.
    Note Input Level Differential = Status Tone/ALMT Level Below Peak Audio + 4.4
    NoteIn order to obtain the value for Status Tone/ALMT Level Below Peak Audio, the configuration for the base radio must be read. For GTR 8000s, use Configuration/Service Software (CSS) and find the value on the Rx Wireline Alignment screen.
  6. Click Apply.
    The BR Advanced Configuration window closes.
  7. Click Write to Device.
    The Modify Device Configuration window closes and the system saves the changes to the MLC 8000 Subsite Link Converter (AGU).
  8. Right-click the MLC 8000 Subsite Link Converter you want to calibrate and select Audio Monitoring or right-click the MLC 8000 Analog Comparator you selected and then click the Audio Monitoring and Calibration button.
    The BR Audio Monitoring and Calibration window opens.
  9. If the Scope Test tab data fields are not displayed, click Scope Test.
  10. Verify that there is status tone (ST) signal from the base radio.
  11. If this system is a mixed mode system, verify that the base radio provides ALMT signal.
    NoteAnalog Link Monitor Tone (ALMT) is only supported on conventional mixed mode channels with the V.24 interface. It is not supported on conventional mixed mode channels with an Ethernet interface. It is not supported on analog conventional channels
  12. Calibrate the input from Radio/Console setting from the base radio (4-w) to the MLC 8000 Subsite Link Converter. Click Input from Radio/Console. Click Calibrate. The pointer on the slider bar is set automatically.
    A message appears asking for confirmation that AGU configuration is complete.
  13. Click Yes.
    Another message appears, stating that a status tone from a base radio is required for calibration to begin.
  14. When a base radio is providing status tone, click Yes.
    If calibration is successful, a message appears indicating that calibration has been completed successfully. If not, an error message displays indicating a problem and calibration must be reattempted.