IEEE 1588 Analysis
251
Overall min. floor
delay
This configuration field is not used in the current implementa-
tion of the floor delay population test.
FPC window length The floor delay population method is based on a sliding win-
dow mechanism. The relevant metrics are referred to a time
window that changes its position in time.
The FPC window length configures the floor delay population
test sliding window length. ITU-T G.8261.1 uses a window
length of 200 s to specify the network operation limits.
FPC delta Configured the delay excess from the floor delay used to
determine the conformity of a received sample. ITU-T
G.8261 uses a delta of 150 s to specify the operation net-
work limit
FPP threshold This parameter is the ratio of conforming samples to the total
amount of received samples. ITU-T G.8261.1 state that at
least 1% of the received samples should be within a 150 s
range accounted from the floor delay computed for the path.
Table 9.12: Floor Delay Population Results
Result Description
FPC (pkts) Floor Packet Count (FPC). This is the amount of conforming
packets received within the current window. This count is
updated once per second as new samples are received and
the test window moves through the time axis.
ITU-T Recommendations do not currently supply any net-
work operation limit based on the FPC metric.
FPR (pkts/s) The Floor Packet Rate (FPR) corresponds with the amount
of conforming samples received per unit time.
ITU-T Recommendations do not currently supply any net-
work operation limit based on the FPR metric.
FPP (%) The Floor Packet Percentage (FPP) is the ratio of conform-
ing samples to received packets expressed as a percentage.
ITU-T G.8261 specifies an FPP of 1% or smaller for a delta
of 150 s and a test window of 200 s.
Estimated floor delay This result field is not used in the current implementation of
the floor delay population test.
Table 9.11: Floor Delay Population Test Configuration Parameters
Setting Description
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