EXFO FTB-800 Series for FTB-1 - Manual (Page 430)

Test Functions
420 FTB-700G/800 Series
OH - OTN

JC, column 16, OPU OH:

Bits 1-6, Reserved (RES), are configurable from binary 000000
(default) to 111111.

Bits 7-8, Justification Control (JC), are configurable from binary
00 (default) to 11. Not available with ODU mux. Changing the JC
value will corrupt the payload.
Row 4

GCC1, column 1-2, ODU OH: The two General Communication
Channel-1 bytes are configurable from 00 (default for each byte) to FF.

GCC2, column 3-4, ODU OH: The two General Communication
Channel-2 bytes are configurable from 00 (default for each byte) to FF.

APS/PCC, column 5-8, ODU OH: The Automatic Protection Switching /
Protection Communication Channel overhead bytes are defined in the
ITU-T G.709 standard. These bytes are configurable from 00 (default) to
FF.

RES, column 9-14, ODU OH: The six Reserved (RES) bytes are
configurable from 00 (default for each byte) to FF.

PSI, column 15, OPU/ODU OH: Tap the PSI field to configure (TX) or
display (RX) the Payload Structure Identifier.

TX: Select any TX byte from the list and its content is displayed
below the list. Tap the Edit button to change its value.

RX: Select any RX byte from the list and its content is displayed
below the list.

NJO, column 16, ODU OH: The Negative Justification Opportunity byte
is not configurable. Available either for non-concatenated signal or on
the LO of a concatenated signal.