Testing The Reference Signals And Selection - Symmetricom SSU-2000e User Manual

Chapter 4 Commissioning the SSU-2000e
Commissioning Tests
7. Verify that the alarm clears, is reported and logged.
8. Enter the command to restore Power A to the original alarm level.

Testing the Reference Signals and Selection

To test the reference signals and selection:
1. Type
INPUT
Each reference input is listed by module position and port number, status, phase
A and B readings, input PQL, signal alarms, and MTIE alarms.
The status should be OK and the Priority Quality Level (PQL) should indicate the
received Sync Status Message (SSM) level or the provisioned value. The phase
values will be dependent on the received signal. The signal alarms should be
present (no alarms present, F indicates an alarm) and the MTIE alarms should all
be OK.
2. Type
REF
signal. Disconnect this input signal and verify a Loss Of Signal (LOS) is reported
for the input, and the unit selects an alternate input for the reference signal.
3. Reconnect the input signal and verify that the LOS condition is cleared and the
reference input is selected according to the system configuration. This depends on
the setting for Revertive Selection, Input Priorities, and Reference Selection mode.
4. Type
EVENT
recorded in the event log.
Testing the Clock Section
To test the clock section:
1. Type
CLK
The system displays the clocks by module position (1A1 for Clock A and 1A12 for
Clock B) and the status for each clock (SEL for the selected clock and OK for the
standby clock).
2. Verify that the PLL mode for each clock is LOCK at this time, and that the Tau
value is at the maximum time constant set for each clock, dependent on the clock
type of ST2 or ST3E.
122 SSU-2000e User's Guide
and press Enter to verify each input signal is present with no alarms.
and press Enter to determine the current selection of input reference
and press Enter to verify that the alarms and events created are
and press Enter to verify each clock is operating properly.
12713140-002-2 Revision E – October 2006