EXFO FTB-800 Series for FTB-1 - Manual (Page 136)

Test Setup - Test Configurator, Timer, and System
126 FTB-700G/800 Series
FTFL/PT
FTFL/PT
From the Test menu, tap Setup, Test Configurator, tap on the signal block,
and on the FTFL/PT tab.
FTFL
Allows the configuration of the Forward and Backward ODU Fault Type
Fault Location (FTFL) to be generated.

Fault Indication and Fault Indication Code allow the selection of the
FTFL fault indicator message/code (byte 0 for forward, byte 128 for
backward) to be generated.
Note: The Fault Indication Code field is automatically updated when the Fault
Indication is changed and vice versa.

Operator Identifier allows editing the Operator Identifier to be
generated (bytes 1 to 9 for forward, bytes 129 to 137 for backward;
9 characters allowed). By default no Operator Identifier is defined.

Operator Specific allows editing the Operator Specific to be
generated (bytes 10 to 127 for forward, bytes 138 to 255 for backward;
118 characters allowed). By default no Operator Specific is defined.
Fault Indication Fault Indication Code (Hex)
No fault 00 (default)
Signal fail 01
Signal Degrade 02
Reserved 03
a
a. Selecting Reserved will use the hexadecimal code 03 but, all codes from 03 to FF
are reserved for future international standardization.