
PM5317 SPECTRA-9953 Telecom Standard Product Data Sheet
Release
Proprietary and Confidential to PMC-Sierra, Inc., and for its customers’ internal use.
Document No.: PMC-2000741, Issue 5
94
A maskable interrupt is activated to indicate any change in the status of OOF, LOF, LOS, line
remote defect indication (RDI-L), line alarm indication signal (AIS-L), synchronization status
message (COSSM), APS bytes (COAPS) and APS byte failure (APSBF) or any errors in section
BIP-8, line BIP-8 and line remote error indication (REI-L).
The RRMP block provides de-scrambled data and frame alignment indication signals for use by
the RHPP.
14.6 Receive Trail trace Processor (RTTP)
The Receive Trail trace Processor (RTTP) block monitors the trail trace messages of the receive
data stream for trace identifier unstable (TIU) defect and trace identifier mismatch (TIM) defect.
Three trail trace algorithms are defined. It is mandatory to select one of the algorithms for the
RTTP to monitor the received message.
The first algorithm is Telcordia-compliant. The algorithm detects trace identifier mismatch
(TIM) defect on a 16 or 64-byte trail trace message. A TIM defect is declared when none of the
last 20 messages matches the expected message. A TIM defect is removed when 16 of the last
20 messages match the expected message. The expected trail trace message is a static message
written in the expected page of the RTTP by an external microprocessor. Optionally, the
expected message is matched when the trail trace message is all zeros.
The second algorithm is ITU compliant. The algorithm detects trace identifier unstable (TIU)
defect and trace identifier mismatch (TIM) defect on a 16 or 64-byte trail trace message. The
current trail trace message is stored in the captured page of the RTTP. If the length of the
message is 16 bytes, the RTTP synchronizes on the MSB of the message. The byte with the
MSB set high is placed in the first location of the captured page. If the length of the message is
64 bytes, the RTTP synchronizes on the CR/LF (CR = 0Dh, LF = 0Ah) characters of the
message. The following byte is placed in the first location of the captured page.
A persistent trail trace message is declared when an identical message is received for three or
five consecutive multi-frames (16 or 64 frames). A persistent message becomes the accepted
message. The accepted message is stored in the accepted page of the RTTP. A TIU defect is
declared when one or more erroneous bytes are detected in a total of eight messages without any
persistent message in between. A TIU defect is removed when a persistent message is received.
A TIM defect is declared when the accepted message does not match the expected message. A
TIM defect is removed when the accepted message matches the expected message. The
expected message is a static message written in the expected page of the RTTP by an external
microprocessor. Optionally, the algorithm declares a match trail trace message when the
accepted message is all zeros.
The third algorithm is not Telcordia/ITU-compliant. The algorithm detects trace identifier
unstable (TIU) on a single continuous trail trace byte. A TIU defect is declared when one or
more erroneous bytes are detected in three consecutive 16-byte windows. The first window
starts on the first erroneous byte. A TIU defect is removed when an identical byte is received
for 48 consecutive frames. A maskable interrupt is activated to indicate any change in the status
of trace identifier unstable (TIU) and trace identifier mismatch (TIM).