EXFO FTB-8500 Series for FTB-500 - Manual (Page 454)

Expert Mode Tabs
440 FTB-8500 Series and FTB-8120NGE/8130NGE
Pattern (BERT)
Errors
Enter the threshold value for Bit Error.

Status: Indicates the real-time Pass/Fail condition.
Grey LED: Indicates that Expert Mode is disabled or the test did not
run yet.
Green LED: Indicates that the threshold is respected (Pass).
Red LED: Indicates that the threshold is not respected (Fail).

Unit: Select the unit. Choices are Second, Count, and Rate. The default
setting is Second.
Error Second Count Rate Default
Bit Error 0 to 1800 seconds 0 to 18000000000000 1.0E-14 to
1.0E-00
0 second