PMC-Sierra, Inc.
PRELIMINARY
PM5381 S/UNI-2488
DATASHEET
PMC-2000489
ISSUE 1
SATURN USER NETWORK INTERFACE FOR 2488 MBIT/S
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 tail trace message. The
current tail 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 tail trace message is declared when an identical message is receive for 3 or 5
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 8 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 tail trace message when the
accepted message is all zeros.
The third algorithm is not BELLCORE/ITU compliant. The algorithm detects trace identifier
unstable (TIU) on a single continuous tail 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).
10.5 Receive High Order Path Processor (RHPP)
The Receive High Order Path Processor (RHPP) provides pointer interpretation, extraction of
path overhead, extraction of the synchronous payload envelope (virtual container), and path level
alarm and performance monitoring.
10.5.1 Pointer Interpreter
The pointer interpreter extracts and validates the H1 and H2 bytes in order to identify the location
of the path overhead byte (J1) and the synchronous payload envelop bytes (SPE) of the
constituent STS-48c (VC-16-16c) payloads. The pointer interpreter is a time multiplexed finite
state machine that can process the STS-48c (AU-16-16c) pointer. Within the pointer
interpretation algorithm three states are defined as shown below:
NORM_state (NORM)
AIS_state (AIS)
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