
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
91
The RRMP also detects loss of frame (LOF) defect and loss of signal (LOS) defect. LOF is
declared when an OOF condition exists for a total period of 3 ms during which there is no
continuous in frame period of 3 ms. LOF output is removed when an in frame condition exists
for a continuous period of 3 ms. LOS is declared when a continuous period of 20 μs without
transitions on the received data stream is detected. LOS is removed when two consecutive
framing patterns are found (based on algorithm 1 or algorithm 2) and during the intervening
time (one frame). There are no continuous periods of 20 μs without transitions on the received
data stream.
The RRMP calculates the section BIP-8 error detection code on the scrambled data of the
complete frame. The section BIP-8 code is based on a bit interleaved parity calculation using
even parity. The calculated BIP-8 code is compared with the BIP-8 code extracted from the B1
byte of STS-1 (STM-0) #1 of the following frame after de-scrambling. Any difference indicates
a section BIP-8 error. The RRMP accumulates section BIP-8 errors in a microprocessor
readable 16 bits saturating counter (up to 1 second accumulation time). Optionally, block
section BIP-8 errors can be accumulated.
The RRMP optionally de-scrambles the received data stream.
The RRMP calculates the line BIP-8 error detection codes on the de-scrambled line overhead
and synchronous payload envelope (SPE) bytes of the constituent STS-1 (STM-0). The line
BIP-8 code is based on a bit interleaved parity calculation using even parity. The calculated
BIP-8 codes are compared with the BIP-8 codes extracted from the B2 byte of the constituent
STS-1 (STM-0) of the following frame after de-scrambling. Any difference indicates a line
BIP-8 error. The master RRMP accumulates line BIP-8 errors in a microprocessor readable 24
bits saturating counter (up to 1 second accumulation time). Optionally, block BIP-24 errors can
be accumulated.
The RRMP extracts the line remote error indication (REI-L) errors from the M1 byte of STS-1
(STM-0) #3 and accumulates them in a microprocessor readable 24 bits saturating counter (up
to 1 second accumulation time). Optionally, block line REI errors can be accumulated.
The RRMP extracts and filters the K1/K2 APS bytes for three frames. The filtered K1/K2 APS
bytes are accessible through microprocessor readable registers. The RRMP also monitors the
unfiltered K1/K2 APS bytes to detect APS byte failure (APSBF-L) defect, line alarm indication
signal (AIS-L) defect and line remote defect indication (RDI-L) defect. APS byte failure is
declared when 12 consecutive frames have been received where no three consecutive frames
contain identical K1 bytes. The APS byte failure is removed upon detection of three
consecutive frames containing identical K1 bytes. The detection of invalid APS codes must be
done is done in software by polling the K1/K2 APS register. Line AIS is declared when the bit
pattern 111 is observed in bits 6, 7, and 8 of the K2 byte for three or five consecutive frames.
Line AIS is removed when any pattern other than 111 is observed for three or five consecutive
frames. Line RDI is declared when the bit pattern 110 is observed in bits 6, 7, and 8 of the K2
byte for three or five consecutive frames. Line RDI is removed when any pattern other than 110
is observed for three or five consecutive frames.
The RRMP extracts and filters the synchronization status message (SSM) for eight frames. The
filtered SSM is accessible through microprocessor readable registers.