17-26
Cisco ONS 15454 DWDM Reference Manual, R8.5
78-18343-02
Chapter 17 Performance Monitoring
17.8 SONET PM Parameter Definitions
17.8 SONET PM Parameter Definitions
Table 17-29 gives definitions for each type of SONET PM parameter available on an ONS 15454 ANSI
node. These parameters become available when the client type is set to OC-3, OC-12, or OC-48 on a
TXP_MR_2.5G or TXPP_MR_2.5G card or to OC-192 on a TXP_MR_10G, TXP_MR_10E,
TXP_MR_10E_C, or TXP_MR_10E_L card. The OC-48 client PM is available on MXP_2.5_10G,
MXP_2.5G_10E, MXP_2.5G_10E_C, MXP_2.5G_10E_L, MXP_MR_10DME_C, and
MXP_MR_10DME_L cards. The OC-48 trunk PM is available on MXP_MR_2.5G and
MXPP_MR_2.5G cards.
Table 17-28 FEC PM Definitions
Parameter Definition
Bit Errors Bit Errors are the number of bit errors corrected.
FEC (NE) FEC enables correction and detection of errors along the optical
links where OTN and FEC are provisioned. FEC uses Reed
Solomon code RS (255,239) encoding. The FEC field is found
in Rows 1 to 4 and Columns 3835 to 4080. It will contain either
the Reed-Solomon RS(255,239) codes, or if FEC is disabled,
fixed stuff bytes (zeros).
Note The FEC PM information can be found in the card view
Performance > OTN PM tab. FEC must be enabled on
the transponder units in order for FEC PM values to be
reported.
UNC-Words Uncorrectable Words (UNC-Words) occur when FEC detects
and corrects errors to deliver a 7 to 8 dB improvement in the
signal-to-noise ratio (also called margin). For ITU G.709, the
FEC code used is Reed-Solomon RS (255, 239).
Table 17-29 SONET PM Parameters
Parameter Definition
CV-L Line Coding Violation (CV-L) indicates the number of coding violations
occurring on the line. This parameter is a count of bipolar violations
(BPVs) and excessive zeros (EXZs) occurring over the accumulation
period.
CV-S Section Coding Violation (CV-S) is a count of bit interleaved parity (BIP)
errors detected at the section layer (that is, using the B1 byte in the
incoming SONET signal). Up to eight section BIP errors can be detected
per STS-N frame; each error increments the current CV-S second register.
ES-L Line Errored Seconds (ES-L) is a count of the seconds containing one or
more anomalies (BPV + EXZ) and/or defects (that is, loss of signal) on
the line.
ES-S Section Errored Seconds (ES-S) is a count of the number of seconds when
at least one section-layer BIP error was detected or an SEF or loss of
signal (LOS) defect was present.
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