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Performance Monitoring for Optical Cards
Table 8-37 Near-End SONET Path H-byte PMs for the OC-12, OC-48, and OC-192 Cards (continued)
Parameter
PPJC-Pgen
NPJC-Pgen
Table 8-38 Near-End Line Layer PMs for the OC-12, OC-48, and OC-192 Cards
Parameter
PSC (BLSR)
PSC (1+1 protection)
PSD
PSC-W
PSD-W
Cisco ONS 15454 Installation and Operations Guide
8-40
Definition
Positive Pointer Justification Count, STS Path Generated (PPJC-Pgen) is
a count of the positive pointer justifications generated for a particular path
to reconcile the frequency of the SPE with the local clock.
Negative Pointer Justification Count, STS Path Generated (PPJC-Pgen) is
a count of the negative pointer justifications generated for a particular
path to reconcile the frequency of the synchronous payload envelope
(SPE) with the local clock.
Definition
For a protect line in a 2-fiber ring, Protection Switching Count (PSC)
refers to the number of times a protection switch has occurred either to a
particular span's line protection or away from a particular span's line
protection. Therefore, if a protection switch occurs on a 2-fiber BLSR, the
PSC of the protection span to which the traffic is switched will increment,
and when the switched traffic returns to its original working span from the
protect span, the PSC of the protect span will increment again.
In a 1 + 1 protection scheme for a working card, Protection Switching
Count (PSC) is a count of the number of times service switches from a
working card to a protection card plus the number of times service
switches back to the working card.
For a protection card, PSC is a count of the number of times service
switches to a working card from a protection card plus the number of
times service switches back to the protection card. The PSC PM is only
applicable if revertive line-level protection switching is used.
For an active protection line in a 2-fiber BLSR, Protection Switching
Duration (PSD) is a count of the number of seconds that the protect line
is carrying working traffic following the failure of the working line. PSD
increments on the active protect line and PSD-W increments on the failed
working line.
For a working line in a 2-fiber BLSR, Protection Switching
Count-Working (PSC-W) is a count of the number of times traffic
switches away from the working capacity in the failed line and back to the
working capacity after the failure is cleared. PSC-W increments on the
failed working line and PSC increments on the active protect line.
For a working line in a 4-fiber BLSR, PSC-W is a count of the number of
times service switches from a working line to a protection line plus the
number of times it switches back to the working line. PSC-W increments
on the failed line and PSC-R or PSC-S increments on the active protect
line.
For a working line in a 2-fiber BLSR, Protection Switching
Duration-Working (PSD-W) is a count of the number of seconds that
service was carried on the protection line. PSD-W increments on the
failed working line and PSD increments on the active protect line.
Chapter 8
Performance Monitoring
November 2001
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