PM5344 datasheet(53/212 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

pulse marking the J1 byte from the pulse marking the C1 byte. The relative

position of the pulses may be changed by:

1. Discontinuous STS (AU) pointer offsets may be generated by accessing

internal SPTX registers If a valid value (i.e., 0 • pointer value • 782) is written

to the appropriated SPTX register, the GC1J1V1 pulse indicating J1 will

immediately jump to the corresponding byte position. If a value greater than

782 is transferred, the J1 indication pulse remains in its present byte position.

2. Positive pointer movements may be generated by accessing internal SPTX

registers. The GPL signal is set low during the positive stuff opportunity byte

position, and the GC1J1V1 pulse indicating J1 will be delayed one byte

position. Positive pointer movements may be inserted once per frame.

3. Negative pointer movements may be generated by accessing internal SPTX

registers. The GPL signal is set high during the negative stuff opportunity

byte position (H3), and the GC1J1V1 pulse indicating J1 will be advanced

one byte position. Negative pointer movements may be inserted once per

frame.

The GENERATED Bus Controller block can be configured to ensure that no

positive or negative stuffs occur within three frames of the last pointer event .

Discontinuous pointer offset events can still occur in any frame. Positive and

negative pointer justifications are provided primarily for diagnostic purposes.

9.5

Transmit Telecombus Aligner

The Transmit Telecombus Aligner (TTAL) block takes the STS-1 SPE (VC3) data

from the ADD bus and aligns it to the frame of the transmit stream. In an STS-3c

(AU4) system, the first STS-1 (first third of VC4) in the stream is processed by an

TTAL in master mode controlling two TTALs in slave mode. The alignment is

accomplished by recalculating the STS (AU) payload pointer value based on the

offset between the transport overhead of the ADD bus and 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 ADD and the transmit stream are accommodated by

pointer adjustments in the transmit stream.

The TTAL may optionally insert the tributary multiframe sequence and clear the

fixed stuff columns. The tributary multiframe sequence is a four byte pattern

('hFC, 'hFD, 'hFE, 'hFF) applied to the H4 byte. The H4 byte of the frame

containing the tributary V1 bytes is set to 'hFD. The fixed stuff columns of a

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