EXFO FTB/IQS-88000 Series Power Blazer for FTB-2/2Pro/500/IQS-600 - Manual (Page 470)

Test Functions
458 FTB/IQS-88000 Series
OH - SONET/SDH
OH - SONET/SDH
The SONET/SDH OH page allows to modify (TX) the overhead information
to be transmitted and to view (RX) the overhead information received.
For SONET/SDH BERT, from the Test menu, tap Functions, and the OH
tab.
For OTN SONET/SDH BERT, from the Test menu, tap Functions, OH, and
the SONET/SDH sub tab.
Tap on any overhead byte in TX to modify its value. In Through Intrusive
and Through Intrusive with Block & Replace topologies make sure to
select the Overwrite check box from the keyboard pop up to activate the
overwrite of the byte. A modified overhead byte value is presented using a
different color and in addition a red triangle is displayed at its bottom-right
corner.
Tap on any overhead byte in RX to see its detailed content/value.
Note: A byte in TX that has no value displayed or is grayed out, is not configurable
from the OH tab.
TX and RX Buttons (SDH)
Tap on the TX or RX button to respectively access the overhead bytes in
transmission or receive mode.
STS-1 Timeslot/STM-1 Channel
Allows to select the timeslot number for the Transport OH bytes. The
STS/AU/TU-3 overhead bytes are always for the timeslot selected in the test
configuration. Furthermore when modifying the Transport OH bytes H1 SS
bits, the modification applies to all timeslots when the test topology is
Coupled while it only affects the timeslot selected in the test configuration
when the test topology is Through Intrusive or Through Intrusive with
Block & Replace. Choices are 1 (default) to 768 (SONET) / 256 (SDH)
depending on the OC-N/STM-N interface selected.