EXFO FTB-800 Series for FTB-1 - Manual (Page 462)

Test Functions
452 FTB-700G/800 Series
Pointer Adjustment
RX Pointer Adjustment

Pointer Value
For STS/AU: Displays the value for the pointer, H1 and H2, indicating the
offset in bytes between the pointer and the first byte of the STS-n
(SONET) or AU-n (SDH).
For VT/TU: Displays the value of the pointer, V1 and V2, indicating the
offset in bytes between the pointer and the first byte of the VTn
(SONET) or TU-n (SDH) of the high order path. However, TU-3
considered a low order path, uses the H1, H2, H3 bytes for its location.

Cumulative Offset indicates the difference between the pointer
increment and the pointer decrement. A pointer jump will reset this
value to 0.

Ptr. Incr. (Pointer Increment) gives statistics on positive pointer
adjustment detected.

Ptr. Decr. (Pointer Decrement) gives statistics on negative pointer
adjustment detected.
Periodic pointer adjustment 26-1 pattern Basic sequence
a
Duration 60 sec
Basic sequence
a
Duration = 30 sec
Periodic 26-1 with Add Add sequence
Duration = 30 sec
Periodic 26-1 with Cancel Cancel sequence
Duration = 30 sec
a. The basic sequence corresponds to the pointer event pattern defined in the standard without any Add or
extra Cancel event.
b. Only available when the Periodic check box is selected.
Pointer Sequence Pattern Initialization Cool down