OTN Performance ParametersOTN Performance Parameters
ItemsItems DefinitionDefinition
SES
Severly Errored Second
Count: The number of seconds during which 15% or more EBs occurred or
one or more alarms were detected.
Ratio: Ratio of SES to total seconds in availability time (SESR: Severely
Errored Second Ratio)
OTU/ODU, Stage n ODU ODU/TCM
OCI
AIS
LCK
PLM
TIM
BDI
OCI
AIS
IAE
LCK
LTC
TIM
BDI
BBE
Background Block Error
Count: EBs that excludes blocks which are determined as SES.
Ratio: Ratio of BBE to all blocks excluding blocks in SES (BBER:
Background Block Error Ratio)
UAS
Unavailable Time
When SES continues for ten seconds, UAS starts from the beginning of the
time. When items other than SES continues for ten seconds, UAS ends at
one second before the time. Refer to the figure of Example of Unavailable
Time Detection.
First, the time (when determining the start of UAS) is not counted as UAS,
and then if determined, the UAS is recounted.
First, the time (when determining the end of UAS) is counted as UAS, and
then if determined, the UAS is recounted. In a word, the values of UAS may
be reduced later. The same is applied to other items.
A bidirectional UAS is counted if forward, backward, or both directions are
in the unavailable state.
Example of Unavailable Time Detection
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