EXFO FTB-800 Series for FTB-1 - Manual (Page 463)

Test Functions
NetBlazer 453
Pointer Adjustment

NDF (New Data Flag) gives statistics on pointer jumps containing a
New Data Flag.
For STS/AU: Bits 1 to 4 of the pointer word (H1 and H2) detected are
“1001”.
For VT/TU: Bits 1 to 4 of the pointer word (V1 and V2) detected are
“1001”.

No NDF (No New Data Flag) gives statistics on normal pointer jumps
containing no NDF.
For STS/AU: Bit 1 to 4 of the pointer word (H1 and H2) detected are
“0110”.
For VT/TU: Bit 1 to 4 of the pointer word (V1 and V2) detected are
“0110”.