EXFO IQS-8100 Series Transport Blazer for IQS-600 - Manual (Page 268)

SONET Tabs
254 IQS-8100 Series Transport Blazer
HOP OH TX/RX (SONET)
HOP OH TX/RX (SONET)
The HOP OH TX allows changing the high order path overhead information
to be transmitted while the HOP OH RX allows verification of the high order
path overhead information received.
Press TEST, HOP, and OH (under HOP TX/RX).
Path Overhead
The following controls are available with SONET/SDH Intrusive through
mode only (optional):
³
The Overwrite check box when enabled, allows the generation of the
selected byte. The byte can be selected by clicking on its blue label.
The byte having its Overwrite check box selected will have its
hexadecimal value on a yellow background. A byte having its
hexadecimal value on a gray background cannot be overwritten.
³
The Overwrite LED indicates if there is any byte in any timeslot having
the Overwrite check box selected (LED is green) or not (LED is gray).
³
Disable All allows to clear the Overwrite check box for all OH bytes in
the HOP.