
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
100
LOPC is declared on entry to the LOPC_state after eight consecutive pointers with values other
than concatenation indications. Path AIS is optionally inserted in the Drop bus when LOPC is
declared. The alarm condition is reported in the ring control port and is optionally returned to
the source node by signaling the corresponding Transmit High Order Path Processor in the local
SPECTRA-9953 device to insert a path RDI indication. Alternatively, if in-band error reporting
is enabled, the path RDI bit in Drop bus G1 byte is set to indicate the LOP alarm to the THPP in
a remote SPECTRA-9953 device.
PAISC is declared on entry to the AISC_state after three consecutive AIS indications. Path AIS
is optionally inserted in the Drop bus when AISC is declared. The alarm condition reported in
the ring control port and is optionally returned to the source node by signaling the
corresponding Transmit High Order Path Processor in the local SPECTRA-9953 device to insert
a path RDI indication. Alternatively, if in-band error reporting is enabled, the path RDI bit in
Drop bus G1 byte is set to indicate the PAIS alarm to the THPP in a remote SPECTRA-9953
device.
14.8.3
Error Monitoring
The RHPP calculates the path BIP-8 error detection codes on the STS-1/3c/12c/48c/192c (VC-
3/4/4-4c/4-16c/4-64c) payloads. When processing a VC-3 payload, the two fixed stuff columns
can be excluded of the BIP-8 calculation if the FSBIPDIS register bit is set. The path 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 B3 byte of each constituent STS
(VC) payload of the following frame. Any differences indicate a path BIP-8 error. The RHPP
accumulates path BIP-8 errors in a microprocessor readable 16 bits saturating counter (up to 1
second accumulation time). Optionally, block BIP-8 errors can be accumulated.
The RHPP extracts the path remote error indication (REI-P) errors from bits 1, 2, 3 and 4 of the
path status byte (G1) and accumulates them in a microprocessor readable 16 bits saturating
counter (up to 1 second accumulation time). Optionally, block block REI errors can be
accumulated.
The RHPP monitors the path signal label byte (C2) payload to validate change in the accepted
path signal label (APSL). The same PSL byte must be received for three or five consecutive
frames (selectable by the PSL5 bit in the configuration register) before being considered
accepted.
The RHPP also monitors the path signal label byte (C2) to detect path payload label unstable
(PLU-P) defect. A PSL unstable counter is increment every time the received PSL differs from
the previously received PSL (an erroneous PSL will cause the counter to be increment twice,
once when the erroneous PSL is received and once when the error free PSL is received). The
PSL unstable counter is reset when the same PSL value is received for three or five consecutive
frames (selectable by the PSL5 bit in the configuration register). PLU-P is declared when the
PSL unstable counter reaches five. PLU-P is removed when the PSL unstable counter is reset.