
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
98
LOP is declared on entry to the LOP_state after eight consecutive invalid pointers or eight
consecutive NDF enabled indications. Path AIS is optionally inserted in the Drop bus when
LOP 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.
PAIS is declared on entry to the AIS_state after three consecutive AIS indications. Path AIS is
inserted in the Drop bus when AIS 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 PAIS alarm to the THPP in a remote SPECTRA-9953.
14.8.2
Concatenation Pointer Interpreter State Machine
The concatenation pointer interpreter extracts and validates the H1 and H2 concatenation bytes.
The concatenation pointer interpreter is a time multiplexed finite state machine that can process
any mix of STS-1/3c/12c/48c/192c (AU3/4/4-4c/4-16c/4-64c) pointers. Within the pointer
interpretation algorithm three states are defined as shown below.
CONC_state (CONC)
AISC_state (AISC)
LOPC_state (LOPC)
The transitions between the states will be consecutive events (indications), for example, three
consecutive AIS indications to go from the CONC_state to the AISC_state. The kind and
number of consecutive indications activating a transition is chosen such that the behavior is
stable and insensitive to low BER.