PM5344 datasheet(45/212 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

Output RPOHFP is provided to identify the most significant bit of the path trace

byte (J1) on RPOH. The path overhead clock, RPOHCK is nominally a 576 kHz

clock. RPOH and RPOHFP are updated with timing aligned to RPOHCLK.

9.1.6 Tandem Connection Originate

The Tandem Connection Originate block updates the path BIP byte (B3) and the

tandem connection maintenance byte (Z5) on the DROP bus when RPOP

originates a tandem connection. Incoming BIP-8 errors are counted and

encoded in the incoming error count field of the Z5 byte. The tandem connection

data link is placed into the data link field of the Z5 byte. The B3 byte is updated

to reflect the changes made to the Z5 byte. When LOP or path AIS alarms are

declared, the incoming error count field of the Z5 byte is set to indicate incoming

signal failure (ISF = 'b1111). The H1, H2 pointer bytes are frozen to the previous

active offset. Path overhead and payload bytes are set to all ones. The tandem

connection data link remains active and the path BIP-8 byte remains valid.

9.1.7 Receive Alarm Port

Received path BIP errors and defect indications (RDI) are communicated to the

transmit path overhead processor (TPOP) in a remote SPTX via the receive

alarm port. The port carries the count of received path BIP errors. Insertion of

path AIS in the DROP bus is reported in the alarm port and will trigger the

remote TPOP to signal path FERF in the transmit stream.

9.2

Receive Path Trace Buffer

The receive portion of the SONET Path Trace Buffer (SPTB) captures the

received path trace identifier message (J1 bytes) into microprocessor readable

registers. It contains two pages of trace message memory. One is designated

the capture page and the other the expected page. Path trace identifier data

bytes from the receive stream are written into the capture page. The expected

identifier message is downloaded by the microprocessor into the expected page.

On receipt of a trace identifier byte, it is written into next location in the capture

page. The received byte is compared with the data from the previous message in

the capture page. An identifier message is accepted if it is received unchanged

three times, or optionally, five times. The accepted message is then compared

with the expected message. If enabled, an interrupt is generated when the

accepted message changes from matching to mismatching the expected

message and vice versa. If the current message differs from the previous

message the unstable counter is incremented by one. When the unstable count

reaches eight, the received message is declared unstable. The received

message is declared stable and the unstable counter reset, when the received

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