Albedo xGenius - Passive Monitoring

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User Guide
252
Once the test has been configured, follow these steps to run the measurement and
read the results:
1. From the Home panel, go to RESULTS,
The test port results panel is displayed.
2. Select Port A to enter in the port specific results.
3. Enter in PTP to display results about the PTP protocol.
4. Go to Floor delay population test (FPP).
5. Press run to start a new test
Note: On the top right corner a Settling indication is displayed at the beginning of
the test. Once the settling period expires the indication changes to Testing but no
result is displayed before the measurement window is filled with data.
6. Check the values of FPC (pkts), FPR (pkts/s) and FPP (%).
7. Verify that the Estimation excess, the Floor delay estimation and Sync packet rate
are acceptable.
9.4.Passive Monitoring
Sometimes, the ability to qualify the operation of an existing PTP slave already
connected to the network is more important than a full emulation of a PTP slave. A
typical example happens when an slave device exhibits poor performance for unknown
reasons. A quick PDV measurement with xGenius could be useful to determine
Observed floor delay This result field is not used in the current implementation of
the floor delay population test.
Estimation excess The Estimation excess is the difference between the floor
delay computed in the initial settling period and the smallest
observed delay during the test period. Ideally, the Estimation
excess should be 0. A value different to 0 implies that the ini-
tial floor delay estimation was not accurate. A large estima-
tion excess may involve a partial accuracy loss in the test
results.
Floor delay estimation This field reports a possible loss of accuracy due to a wrong
estimation of the floor delay.
Sync packet rate The Sync packet rate field reports modifications on the Sync
message packet rate during the current test. Message rate
modifications affect the test results and must be avoided dur-
ing the testing period.
Table 9.12: Floor Delay Population Results
Result Description