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Chapter 8
Performance Monitoring
Table 8-30 Near-End Line Layer PMs for the OC-3 Card
Parameter
CV-L
ES-L
SES-L
UAS-L
FC-L
Table 8-31 Near-End Line Layer PMs for the OC-3 Cards
Parameter
PSC (1+1 protection)
PSD
November 2001
Definition
Near-End Line Code Violation (CV-L) is a count of BIP errors detected at
the line-layer (i.e. using the B2 bytes in the incoming SONET signal). Up
to 8 x N BIP errors can be detected per STS-N frame; each error
increments the current CV-L second register.
Near-End Line Errored Seconds (ES-L) is a count of the seconds when at
least one line-layer BIP error was detected or an AIS-L defect was
present.
Near-End Line Severely Errored Seconds (SES-L) is a count of the
seconds when K (see GR-253-CORE for values) or more line-layer BIP
errors were detected or an AIS-L defect was present.
Near-End Line Unavailable Seconds (UAS-L) is a count of the seconds
when the line is unavailable. A line becomes unavailable when ten
consecutive seconds occur that qualify as SES-Ls, and it continues to be
unavailable until ten consecutive seconds occur that do not qualify as
SES-Ls.
Near-End Line Failure Count (FC-L) is a count of the number of near-end
line failure events. A failure event begins when an AIS-L failure is
declared or when a lower-layer traffic-related, near-end failure is
declared. This failure event ends when the failure is cleared. A failure
event that begins in one period and ends in another period is counted only
in the period where it begins.
Definition
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.
Note
BLSR is not supported on the OC-3 card; therefore, the PSC-W,
PSC-S, and PSC-R PMs do not increment.
Protection Switching Duration (PSD) applies to the length of time, in
seconds, that service is carried on another line. For a working line, PSD
is a count of the number of seconds that service was carried on the
protection line.
For the protection line, PSD is a count of the seconds that the line was
used to carry service. The PSD PM is only applicable if revertive
line-level protection switching is used.
Note
BLSR is not supported on the OC-3 card; therefore, the PSD-W,
PSD-S, and PSD-R PMs do not increment.
Cisco ONS 15454 Installation and Operations Guide
Performance Monitoring for Optical Cards
8-35
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