EXFO FTB-8510B Guia Del Usuario página 1283

Pointer Value
The pointer value indicates the offset between the pointer word and
the first byte fo the VT SPE. The V1 through V4 bytes are not counted in
the offset calculation. The pointer is a binary number with the
following range:
VT1.5
VT2
VT3
VT6
SONET/SDH Application
Path
0
0
0
0
Glossary
SONET - VT Path Overhead
Range
103
139
211
427
633