Cisco Systems ONS 15600 manual 12-8

Chapter 12 Performance Monitoring

12.4 Performance-Monitoring Parameter Definitions

Table 12-2	Performance Monitoring Parameters (continued)
Parameter		Definition
PSD (1+1)		In a 1+1 protection scheme, 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.
PSD (BLSR)		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.
		Therefore, if a protection switch occurs on a two-fiber BLSR, the PSD 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 PSD of the
		protect span will stop incrementing.
PSD-R		In a four-fiber BLSR, Protection Switching Duration-Ring (PSD-R) is a count of the
		seconds that the protection line was used to carry service. A count is only
		incremented if ring switching is used.
PSD-S		In a four-fiber BLSR, Protection Switching Duration-Span (PSD-S) is a count of the
		seconds that the protection line was used to carry service. A count is only
		incremented if span switching is used.
PSD-W		For a working line in a two-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.
SEFS-S		Section Severely Errored Framing Seconds (SEFS-S) is a count of the seconds when
		an SEF defect was present. An SEF defect is expected to be present during most
		seconds when an LOS or loss of frame (LOF) defect is present. However, there can
		be situations when the SEFS-S parameter is only incremented based on the presence
		of the Severely Errored Framing (SEF) defect.
SES-L		Line Severely Errored Seconds (SES-L) is a count of the seconds containing more
		than a particular quantity of anomalies (BPV + EXZ > 1544) and/or defects on the
		line.
SES-LFE		Far-End Line Severely Errored Seconds (SES-LFE) is a count of the seconds when K
		(see Telcordia GR-253-CORE for values) or more line-layer BIP errors were reported
		by the far-end LTE or an RDI-L defect was present.
SES-P		Near-End STS Path Severely Errored Seconds (SES-P) is a count of the seconds when
		K (2400) or more STS path BIP errors were detected. An AIS-P defect (or a
		lower-layer, traffic-related, near-end defect) or an LOP-P defect can also cause an
		SES-P.

Cisco ONS 15600 Reference Manual, R7.2

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