EXFO FTB-8500 Series for FTB-500 - Manual (Page 372)

Advanced Tab
358 FTB-8500 Series and FTB-8120NGE/8130NGE
Service Disruption Time (SDT)
Configuration
Select the criteria that will be used for the SDT measurement.
Note: The service disruption measurements are cleared when changing the
criteria.

Measurement Mode: Select the SDT measurement mode. Choices are
Defect Mode and No Traffic Mode. The default setting is Defect Mode.
Defect Mode is based on the detection of defects including LOS, Link
down, Invalid FCS, LSS, and Bit errors in the payload. The SDT
measurement is the time between the first defect and either the end of
the last defect preceding the No Defect Time period, or the end of the
test period.
No Traffic Mode is based on the absence of traffic. The SDT
measurement is the time between the end of the last received frame
and either the beginning of a new received frame, or the end of the test
period.

No Traffic Time: Available for No Traffic Mode only. No Traffic Time is
a configured value which raises a defect if no Ethernet frame is
received during the defined test period. Choices are:
Unit choices are μs, ms, and s. The default setting is 10000 μs.
Rate No Traffic Time range
10/100/1000Mbps 10 to 99990 μs for FTB-8510B
20 to 99990 μs for FTB-8120NGE/FTB-8130NGE
and FTB-8525/FTB-8535
10Gbps 10 to 100000 μs for FTB-8510G
10 to 99990 μs for FTB-8120NGE/FTB-8130NGE
and FTB-8525/FTB-8535