PM5344 datasheet(51/212 Pages) PMC

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PM5344 SPTX

DATA SHEET

PMC-930531

ISSUE 6

SONET/SDH PATH TERMINATING TRANSCEIVER

PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE

immediately inserted on detection on ISF and removed on detection of inactive

ISF code.

9.4

Transmit Path Overhead Processor

The Transmit Path Overhead Processor (TPOP) provides transport frame

alignment generation, path overhead insertion, insertion of the synchronous

payload envelope, insertion of path level alarm signals and path BIP-8 (B3)

insertion. Path overhead insertion is disabled at intermediate tandem connection

nodes.

9.4.1 BIP-8 Calculate

The BIP-8 Calculate Block performs a path bit interleaved parity calculation on

the SPE (VC) of the outgoing STS-1 (AU3) or STS-3c (AU4) stream. The fixed

stuff columns in the VC3 format may be optionally excluded from BIP

calculations. The resulting parity byte is inserted in the path BIP-8 (B3) byte

position of the subsequent frame. BIP-8 errors may be continuously inserted

under register control for diagnostic purposes.

9.4.2 FEBE Calculate

The FEBE Calculate Block accumulates far end block errors on a per frame

basis, and inserts the accumulated value (up to maximum value of eight) in the

FEBE bit positions of the path status (G1) byte. The FEBE information is derived

from path BIP-8 errors detected by the Receive Path Overhead Processor,

RPOP. The asynchronous nature of these signals implies that more than eight

FEBE events may be accumulated between transmit G1 bytes. If more than

eight receive Path BIP-8 errors are accumulated between transmit G1 bytes, the

accumulation counter is decremented by eight, and the remaining FEBEs are

transmitted at the next opportunity. Alternatively, path FEBE can be accumulated

from FEBE error counts reported on the transmit alarm port when the local SPTX

is paired with a receive section of a remote SPTX. Far end block errors may be

inserted under register control for diagnostic purposes. Optionally, FEBE

insertion may be disabled and the incoming G1 byte passes through unchanged

to support applications where the received path processing does not reside in

the local SPTX.

9.4.3 Transmit Alarm Port

Received path BIP errors and defect indications (RDI) from Receive Path

Overhead Processors (RPOP) in a remote SPTX is communicated to the local

PM5344 Datasheet(PDF) 51 Page - PMC-Sierra, Inc