EXFO FTB/IQS-85100G Packet Blazer for FTB-500/IQS-600 - Manual (Page 296)

Test Functions
286 FTB/IQS-85100G
OH - OTN
The third SM byte (column 10) contains the following sub-fields. This
byte is configurable from 00 (default) to FF.

GCC0, columns 11-12, OTU OH: The two General Communication
Channel-0 bytes are configurable from 00 (default) to FF.

RES, columns 13-14, OTU OH: The two Reserved (RES) bytes are
configurable from 00 (default) to FF.

JC4 or RES
1
JC4, column 15, OPU OH: Bits 1-3 set to all-0s, and bits 4-8 are
controlled by GMP function. This byte is not configurable.
RES, column 15, OPU OH: The Reserved (RES) byte is configurable
from 00 (default) to FF.

JC1 or JC
1
JC1, column 16, OPU OH: Controlled by GMP function. This byte is not
configurable.
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.
Bit 1-4 Bit 5 Bit 6 Bit 7-8
BEI/BIAE BDI IAE RES
1. Depending on the test MUX/Mapping.