PM5363 TUPP+622
TUPP+622
DATASHEET
PMC-1981421
ISSUE 4
SONET/SDH TRIBUTARY UNIT PAYLOAD PROCESSOR FOR 622 MBIT/S
INTERFACES
in the outgoing data stream. The identification of the V1-V3 bytes of VTs, or TUs
(H1-H3 bytes of TU3s) allows the pointer generator to function.
The sequence of H4 bytes is generated by each tributary payload processor and
inserted into the outgoing administrative units. The six most significant bits of H4
are set to logic 1. The sequence of the remaining two H4 bits is determined by
the corresponding OTMF input.
10.3.7 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 6):
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
97
PMC [ PMC-SIERRA, INC ]
