Compensation of frequency synchronization error
The pointer can not only fulfill a fixed phase shift and mismatch clock multiplexer clocked device, from which the user data is received. To compensate for this effect, the index value is periodically incremented or decremented.
- The pointer is incremented by one, reflecting the delay start of the next container VC-4, three bytes.
- to accommodate the "extra" bytes used three younger byte pointer, ie the NT box (the pointer itself fits in fields H1 and H2)