
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
232
Register 00B2H: RTTP Path Trace Unstable Status
Bit
Type
Function
Default
Bit 15
Unused
Bit 14
Unused
Bit 13
Unused
Bit 12
Unused
Bit 11
R
TIUV[12]
X
Bit 10
R
TIUV[11]
X
Bit 9
R
TIUV[10]
X
Bit 8
R
TIUV[9]
X
Bit 7
R
TIUV[8]
X
Bit 6
R
TIUV[7]
X
Bit 5
R
TIUV[6]
X
Bit 4
R
TIUV[5]
X
Bit 3
R
TIUV[4]
X
Bit 2
R
TIUV[3]
X
Bit 1
R
TIUV[2]
X
Bit 0
R
TIUV[1]
X
TIUV[12:1].
The trace identifier unstable status bits indicate the current status of the TIU defects for
STS-1/STM-0 paths #1 to #12
Algorithm 1: TIUV is set to logic 0.
Algorithm 2: TIUV is set to logic 1 when one or more erroneous bytes are detected between
the current message and the previous message in a total of 8 trail trace messages without
any persistent message in between. TIUV is set to logic 0 when a persistent message is
found. A persistent message is found when the same message is receive for 3 or 5
consecutive multi-frames.
Algorithm 3: TIUV is set to logic 1 when one or more erroneous bytes are detected in three
consecutive sixteen byte windows. The first window starts on the first erroneous trail trace
byte. TIUV is set to logic 0 when the same trail trace byte is received for 48 consecutive
frames.
Note: If a path is reconfigured from master to slave, and the path previously had a TIU
defect, then the defect may persist after the config change. For this reason, ALGO[1:0] bits
should be set to 00b (algorithm disable) for slave paths. This will clear any lingering
defects on slave paths.