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PM5342 SPECTRA-155

DATA SHEET

PMC-970133

ISSUE 4

SONET/SDH PAYLOAD EXTRACTOR/ALIGNER

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

DESCRIPTION

The PM5342 SONET/SDH PAYLOAD EXTRACTOR/ALIGNER (SPECTRA-155)

terminates the transport and path overhead of STS-1 (STM-0/AU3) and

STS-3/3c (STM-1/AU3/AU4) streams at 51.84 Mbit/s and 155.52 Mbit/s

respectively. The SPECTRA-155 implements significant functions for a

SONET/SDH compliant line interface.

The SPECTRA-155 receives SONET/SDH frames via a bit serial interface,

recovers clock and data, and terminates the SONET/SDH section (regenerator

section), line (multiplexer section), and path. It performs framing (A1, A2),

descrambling, detects alarm conditions, and monitors section and line bit

interleaved parity (BIP) (B1, B2), accumulating error counts at each level for

performance monitoring purposes. B2 errors are also monitored to detect signal

fail and signal degrade threshold crossing alarms. Line remote error indications

(M1) are also accumulated. A 16 or 64 byte section trace (J0) message may be

buffered and compared against an expected message. In addition, the

SPECTRA-155 interprets the received payload pointers (H1, H2), detects path

alarm conditions, detects and accumulates path BIPs (B3), monitors and

accumulates path Remote Error Indications (REIs), accumulates and compares

the 16 or 64 byte path trace (J1) message against an expected result and

extracts the synchronous payload envelope (virtual container). All transport and

path overhead bytes are extracted and serialized on lower rate interfaces,

allowing additional external processing of overhead, if desired.

The extracted SPE (VC) is either placed on a Telecombus DROP bus, serialized

into DS3 streams, or serialized into data streams. For Telecombus applications,

frequency offsets (e.g., due to plesiochronous network boundaries, or the loss of

a primary reference timing source) and phase differences (due to normal network

operation) between the received data stream and the DROP bus are

accommodated by pointer adjustments in the DROP bus. For the DS3

application, the SPECTRA-155 demaps the three DS3s from the STS-3

(STM-1/AU3) SPE and provides serialized bit streams with derived clocks. For

data applications, the SPECTRA-155 either presents the extracted SPE (VC) as

a byte/nibble serial stream with an associated clock or presents the STS-3

(STM-1/AU3) SPE into three bit serial streams with associated clocks.

The SPECTRA-155 transmits SONET/SDH frames, via a bit serial interface, and

formats section (regenerator section), line (multiplexer section), and path

overhead appropriately. The SPECTRA-155 provides transmit path origination

for a SONET/SDH STS-1 (STM-0/AU3), STS-3 (STM-1/AU3) or STS-3c

(STM-1/AU4) stream. It performs framing pattern insertion (A1, A2), scrambling,

alarm signal insertion, and creates section and line BIPs (B1, B2) as required to

allow performance monitoring at the far end. Line remote error indications (M1)

PM5342 Datasheet(PDF) 39 Page - PMC-Sierra, Inc

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