Testing The Output Section - Symmetricom SSU-2000e User Manual

The PQL should be the level the clock is supplying to the Output modules, and
depends on the reference input when in lock mode. The frequency offset is
dependent on the clock type, typically less than 2 x 10
-6
10 for ST3E, and less than 2 x 10
uncorrected frequency offset of the oscillator which is being removed by the clock
DDS circuitry.
The sigma value indicates the stability of the clock, which should be less than 1 x
-9
10 .

Testing the Output Section

To test the output section:
1. Type
OUTPUT
no alarms. This command displays the Output modules by position with module
status OK and the selected clock. The clock status indicates the presence or
absence of the four possible clocks A, B, C (bypass), or D (expansion shelf only).
2. Verify that any outputs configured for redundant pairs are so indicated in the status
report. The PQL will indicate the output SSM level for all ports and is supplied by the
selected clock.
3. Verify that all output ports (which are intended to be active) indicate Y in the port
status.
Testing the System Stability and Accuracy (Optional)
Perform this test only if a PRS (primary reference source) and the necessary test
equipment is available. If the above tests have been passed, the system output will
meet the stability and accuracy of the reference input.
1. Connect one of the system outputs and the PRS signal to the test equipment to
monitor the stability and accuracy. This test should be allowed to run for 24 hours
to collect sufficient data to verify the system output meets specifications.
2. Process the collected 24 hour data and verify that the frequency and stability
(MTIE and TDEV) meet the specifications.
This completes the commissioning tests. The system is ready to be placed in
service.
12713140-002-2 Revision E – October 2006
and press Enter to verify that each Output module is operating with
Chapter 4 Commissioning the SSU-2000e
-10
-7
for Type I. This only indicates the
Commissioning Tests
for ST2, less than 1 x
SSU-2000e User's Guide 123