EXFO IQS-8100 Series Transport Blazer for IQS-600 - Manual (Page 257)

SONET Tabs
SONET/SDH Application 243
APS/Advanced Line OH TX/RX (SONET)
H1
³
SS Bits (H1): Bits 5 and 6 of the H1 byte represent the SS bits.
³
Overwrite: The Overwrite check box when selected, allows the
generation of the selected SS Bits. Overwrite is available with
SONET/SDH Intrusive mode only. In normal mode, the SS Bits are
written on all timeslots (foreground and background). When
SONET/SDH Intrusive is selected, the SS Bits are written on the
foreground timeslots only.
SS Bits Description
00 SONET
01 Undefined
10 SDH
11 Undefined