PM5313 datasheet(49/646 Pages) PMC

49 / 646 page

PRODUCTION

PMC-Sierra, Inc.

PM5313 SPECTRA-622

DATASHEET

PMC-1981162

ISSUE 6

SONET/SDH PAYLOAD EXTRACTOR/ALIGNER FOR 622 MBIT/S

PROPRIETARY AND CONFIDENTIAL

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

In addition, the SPECTRA-622 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-622 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-622 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 or from

DS3 serial streams. For Telecombus applications, the SPECTRA-622 maps the

SPE from a Telecom 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-622

maps the DS3s into an STS-12 (STM-4/AU3/AU4) SPE. Both the Telecom and

DS3 ADD buses can be active at the same time supporting a mixed use

multiplexer function on the system ADD side.

The SPECTRA-622 supports Time-Slot Interchange (TSI) on the Telecom ADD

and DROP buses. On the DROP side, the TSI views the receive stream as

twelve independent time-division multiplexed columns of data (i.e. twelve

constituent STS-1 (STM-0/AU3) or equivalent streams or time-slots or columns).

Any column can be connected to any time-slot on the DROP bus. Both column

swapping and broadcast are supported. Time-Slot Interchange is independent of

the underlying payload mapping formats. Similarly, on the ADD side, data from

the ADD bus is treated as twelve independent time-division multiplexed columns.

Assignment of data columns to transmit time-slots (STS-1 (STM-0/AU3) or

equivalent streams) is arbitrary.

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-622 is configured,

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

The SPECTRA-622 is implemented in low power, +3.3 Volt, CMOS technology. It

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

in a 520 pin SBGA package.

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