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SONET loopback test feature

This section describes how to perform the two loopback tests, internal and external, both with Device Manager. Internal is the default.


 Note: All ports must be in test mode to conduct any testing.

To test for loopback:

  1. Highlight the port.
  2. Choose Edit > port.
    3. The Port dialog box opens with the Interface tab displayed.
  3. In the AdminStatus field, click testing.
  4. Click Apply.
  5. Click the Test tab.

    6. The Test tab is displayed.

    The table below describes the Test tab items.
  1. Click Ext. Loopback to test the external loopback or click Int. Loopback to test the internal loopback.
    2. A dialog box displays the test results.
  2. Click Stop to cease testing.
  3. Click Close.
  4. Click the Interface tab.
  5. In the AdminStatus field, click up.
  6. Click Apply.

    Note Note: To run the external loopback test, you need a loopback cable on that port.

The test statistics are available only when the test has finished, unlike Ethernet ports where the test statistics can be viewed during testing.

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