EXFO FTB/IQS-88000 Series Power Blazer for FTB-2/2Pro/500/IQS-600 - Manual (Page 484)

Test Functions
472 FTB/IQS-88000 Series
OH - SONET/SDH

Z7 /K4 : Extended signal label
Disable all Overwrites
Clear the Overwrite check box for all TX bytes. Only available with
SONET/SDH BERT test application in Through Intrusive and Through
Intrusive with Block & Replace topologies.
Default all OH
Returns all TX overhead bytes to their factory default values.
Bits
Description
Z7 (SONET) K4 (SDH)
1 Extended signal label. Bits 12 to 19 of the 32 bit frame multiframe (see Z7/K4 Structure on page 470)
contain the extended signal label.
2 Virtual concatenation. Bits 1 to 5 of the 32 bit frame multiframe (see Z7/K4 Structure on page 470)
contain the LO virtual concatenation frame count while bits 6 to 11 contain the LO virtual
concatenation sequence indicator.
3 - 4 unassigned and reserved for APS signaling for protection at the lower order path level.
5 - 7 These bits in combination with bit 8 of V5 are
allocated for RDI -V/ERDI-V signal Optional use.
8 unassigned and reserved for a lower order path data link.