Symmetricom 1000, 1100 Testing the Reference Switching, Testing the Non-Revertive Operating Mode

Chapter 5 Testing the TimeProvider

Testing Alarm Conditions

Testing the Reference Switching

To test the ability of the TimeProvider to switch references, you perform a two-step test:

Connect appropriate reference inputs to the TimeProvider.

Create a fault on the selected reference signal and observe that the TimeProvider changes to the appropriate secondary input.

To test the reference switching:

1.Connect a suitable reference signal to the PRS input and a second reference signal to the INP1 input. Wait for the Qualified LEDs for both inputs to turn green and for the Active LED to light on the PRS input.

2.Issue the ED-EQPT::PRS:::INSTATE=DISABLE;command to disable the PRS input and force the TimeProvider to switch to the INP1 reference.

3.Observe that the Active LED changes from the original input to the secondary input (PRS to INP1 or INP1 to PRS).

Testing the Non-Revertive Operating Mode

When the TimeProvider is in the non-revertive operating mode, the input reference signal does not revert to the original input after it recovers from an error condition.

The TimeProvider is in non-revertive mode when the QLEVEL parameter for INP1, INP2, and PRS inputs is set to the same value, and the PRIORITY parameters for the same inputs are set to the same level.

To test the non-revertive operating mode, perform the following steps:

1.Define the non-revertive mode by setting the QLEVEL and PRIORITY parameters to appropriate values. See Setting the Input Quality Level, on page 112, and Setting the Input Priority Level, on page 113, for further information.

2.Provision and connect appropriate reference inputs to the TimeProvider.

3.Create a fault on the selected reference signal and observe that the TimeProvider changes to the appropriate secondary input.

4.Remove the fault on the initial reference signal and observe that the TimeProvider does not revert to that initial reference input. The event log indicates that the reference signal is no longer in fault.

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