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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

are optionally inserted. A 16 or 64 byte section trace (J0) message may be

inserted. In addition, the SPECTRA-155 generates the transmit payload pointers

(H1, H2), creates and inserts the path BIP, optionally inserts a 16 or 64 byte path

trace (J1) message, optionally inserts the path status byte (G1). In addition to its

basic processing of the transmit SONET/SDH overhead, the SPECTRA-155

provides convenient access to all overhead bytes, which are inserted serially on

lower rate interfaces, allowing additional external sourcing of overhead, if

desired. The SPECTRA-155 also supports the insertion of a large variety of

errors into the transmit stream, such as framing pattern errors and BIP errors,

which are useful for system diagnostics and tester applications.

The inserted SPE (VC) is either sourced from a Telecombus ADD stream, from

DS3 serial streams or from data streams. For Telecombus applications, the

SPECTRA-155 maps the SPE from a Telecombus ADD bus into the transmit

stream. 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 transmit data stream and the ADD bus

are accommodated by pointer adjustments in the transmit stream. For the DS3

application, the SPECTRA-155 maps three DS3s into a STS-3 (STM-1/AU3)

SPE. For the data applications, the SPECTRA-155 maps a byte/nibble serial

data stream into a STS-1 (STM-0/AU3) SPE or STS-3c (STM-1/AU4) SPE

transmit stream or maps three bit serial streams into a STS-3 (STM-1/AU3) SPE

transmit stream.

The SPECTRA-155 supports tandem connection termination applications where

the tandem connection maintenance byte (Z5) carries the incoming BIP-8 error

count (IEC), a tandem data link, and a path AIS code (ISF). The incoming error

count is accumulated and the receive data link is serialized for external

processing. A new data link can be inserted from a low speed serial input. An

incoming signal failure alarm (ISF) is used to convey path AIS in place of all-ones

in the pointer (H1, H2).

The transmitter and receiver are independently configurable to allow for

asymmetric interfaces. Ring control ports are provide to pass control and status

information between mate transceivers. The SPECTRA-155 is configured,

controlled and monitored via a generic 8-bit microprocessor bus interface.

The SPECTRA-155 is implemented in low power, +5 Volt, CMOS technology. It

has TTL and pseudo ECL (PECL) compatible inputs and outputs and is

packaged in a 256 pin SBGA package.

PM5342 Datasheet(PDF) 40 Page - PMC-Sierra, Inc

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