PM5316 datasheet(89/491 Pages) PMC

89 / 491 page

SONET/SDH Payload Extractor/Aligner (SPECTRA-4x155)

Production

Proprietary and Confidential to PMC-Sierra, Inc. and for its customers’ internal use

Document ID: PMC-1990822, Issue 4

When processing a concatenated stream, individual DPGM blocks, including the master DPGM,

independently monitor their corresponding one third (1 in 3) of the complete PRBS payload

sequence according to the SONET/SDH concatenated mode of the stream. The master DPGM

will be monitoring the partial sequence contained in the 1st (after the transport overhead columns)

and subsequent SPE bytes occurring at a 3-byte interval. The next partial sequence contained in

the 2nd and every third bytes thereafter will be validated by the first (in the order of payload

reception) slave DPGM and so on. Individual DPGM synchronization status and error count

accumulation are provided. Optionally, an interrupt can be generated by the DPGM whenever a

loss of synchronization or re-synchronization occurs.

Path overhead bytes and fixed stuff columns in the receive concatenated stream will be

collectively skipped over as described for the PRBS generator of the DPGM. To ensure that all

payload bytes (all STS-1 (STM-0/AU-3) or equivalent streams) in a concatenated stream together

contain a single PRBS sequence, the signature generation by the master DPGM and signature

matching by the slave DPGM monitors will be performed as described for the PRBS generation.

Individual DPGM can only declared that has synchronized to the receive PRBS sequence when it

has synchronized to its corresponding partial sequence and its has detected no signature

mismatch.

10.9.5 Pointer Justification Monitor

The Pointer Justification Monitor (PMON) of RPPS accumulates pointer justification events

(PJE) events in counters over intervals which are defined by the supplied transfer clock signal.

The counters saturate at 255. Four counters are provided in order to accumulate four types of

events; increment and decrement of receive or transmit pointers. The receive pointer events can

be those of the receive stream before the FIFO or can be those of the Drop bus after rate adaption

in the RTAL FIFO.

When the transfer signal is applied by writing to the TIP register bit, the PMON transfers the

counter values into holding registers and resets the counters to begin accumulating error events

for the next interval. The counters are reset in such a manner that error events occurring during

the reset period are not missed. Writing to internal registers can also trigger this transfer.

10.10 Transmit Path Processing Slice (TPPS)

The Transmit Path Processing Slice (TPPS) generates transport frame alignment, inserts path

overhead and the SPE as well as path level alarm signals and path BIP-8 (B3) for an STS-1

(STM-0/AU-3) SPE (VC-3) or equivalent data stream from the Add bus. Path trace identifier

message (J1 bytes) can also be inserted. Plesiochronous frequency offsets and phase differences,

from normal network operation, between the Add bus and the line are accommodated by pointer

adjustments in the transmit stream. The TPPS can optionally interpret the pointer (H1, H2) and

detect alarm conditions (for example, PAIS) in the STS-1 (STM-0/AU-3) SPE (VC-3) or

equivalent data stream from the Add bus. PRBS payload generation and monitoring is also

supported on a per STS (AU) basis.

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