EXFO FTB-800 Series for FTB-1 - Manual (Page 347)

Test Results
NetBlazer 337
Summary
Service Disruption
Note: Service Disruption results are only available with Transport and EtherBERT
test applications when Disruption Monitoring is enabled (refer to BERT
on page 101 or EtherBERT and Unframed BERT on page 114). When
Service Disruption is disabled, the message Service disruption
monitoring disabled is displayed.
Service Disruption is the time during which there is a disruption of service
due to the detection of defects.

Disruption Time
Longest (ms): Indicates the longest measured disruption time.
Shortest (ms): Indicates the shortest measured disruption time.
Last (ms): Indicates the length of the last measured disruption time.
Average (ms): Indicates the average duration of all measured
disruption times.
Total (ms): Indicates the total duration of all measured disruption
times.

Defect, available with Transport test applications, indicates on which
layer and defect the service disruption time test is performed.

Disruption Count: Indicates the number of disruption events detected
since the beginning of the SDT test.
Note: When a disruption event is equal or longer than the test period which is
fixed to 5 minutes, then the measured disruption time is equal to the test
period.

SDT Threshold (ms) allows to enter the SDT threshold value that will
be used to declare the pass/fail verdict: 0.005 to 299999.995 ms in step
of 0.005 ms (default is 50 ms). This setting is only accessible when
Pass/Fail Verdict is enabled and is coupled with the SDT Threshold set
from the test setup (refer to page 105).