PM5362TUPP-PLUS
DATA SHEET
PMC-951010
ISSUE 6
SONET/SDH TRIBUTARY UNIT PAYLOAD PROCESSOR / PERFORMANCE MONITOR
8.3.7 Pointer Generator
The pointer generator block generates the tributary pointers (V1/V2 or H1/H2 in
TU3 mode) as specified in the references. The pointer value is used to
determine the location of the tributary path overhead byte (V5 or J1 in TU3
mode) on the outgoing stream. The algorithm can be modeled by a finite state
machine. Within the pointer generator algorithm, five states are defined (as
shown in Figure 2):
NORM_state (NORM)
AIS_state (AIS)
NDF_state (NDF)
INC_state (INC)
DEC_state (DEC)
The transition from the NORM to the INC, DEC, and NDF states are initiated by
events in the payload buffer block. The transition to/from the AIS state are
controlled by the pointer interpreter block.The transitions from INC, DEC, and
NDF states to the NORM state occur autonomously with the generation of
special pointer patterns.
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
48
PMC [ PMC-SIERRA, INC ]
