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Cisco ONS 15454 Installation and Operations Guide
November 2001
Chapter 8 Performance Monitoring
Performance Monitoring for Optical Cards
8.6 Performance Monitoring for Optical Cards
The following sections define performance monitoring parameters and definitions for the OC-3, OC-12,
OC-48, and OC-192.
8.6.1 OC-3 Card Performance Monitoring Parameters
Figure 8-21 shows where overhead bytes detected on the ASICs produce performance monitoring
parameters for the OC-3 card.
Table 8-28 Far-End VT PMs for the DS3XM-6 Card
Parameter Definition
CV-V
Code Violation VT Layer (CV-V) is a count of the BIP errors detected at
the VT path layer. Up to two BIP errors can be detected per VT
superframe; each error increments the current CV-V second register.
ES-V
Errored Seconds VT Layer (ES-V) is a count of the seconds when at least
one VT Path BIP error was detected. An AIS-V defect (or a lower-layer,
traffic-related, near-end defect) or an LOP-V defect can also cause an
ES-V.
SES-V
Severely Errored Seconds VT Layer (SES-V) is a count of seconds when
K (600) or more VT Path BIP errors were detected. An AIS-V defect (or
a lower-layer, traffic-related, near-end defect) or an LOP-V defect can
also cause an SES-V.
UAS-V
Unavailable Second VT Layer (UAS-V) is a count of the seconds when
the VT path was unavailable. A VT path becomes unavailable when ten
consecutive seconds occur that qualify as SES-Vs and continues to be
unavailable until ten consecutive seconds occur that do not qualify as
SES-Vs.
