SDH/SONET Performance ParametersSDH/SONET Performance Parameters
ItemsItems DefinitionDefinition
ES
Errored Second
Count: The number of seconds during which one or more EBs occurred or
one or more alarms were detected.
Ratio: Ratio of ES to total seconds in availability time (ESR: Errored Second
Ratio)
SES
Severely Errored Second
Count: The number of seconds during which 30% 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)
BBE
Background Block Error
Count: EBs that occurred in non-SES.
Ratio: Ratio of BBE to all blocks excluding blocks in SES (BBER: Background
Block Error Ratio)
UNAV
Unavailable Time
When SES continues for ten seconds, UNAV starts from the beginning of
the time. When items other than SES occur, UNAV ends at one second
before the time.
The following is the alarms which are counted as ES or SES:
SDH
MS-AIS, MS-RDI, AU-AIS, AU-LOP, HP-TIM, HP-UNEQ, HP-RDI, TU-AIS, TU-
LOP, LP-TIM, LP-UNEQ, LP-RDI
SONET
AIS-L, RDI-L, AIS-P, LOP-P, TIM-P, UNEQ-P, RDI-P, AIS-V, LOP-V, TIM-V,
UNEQ-V, RDI-V
When the standard of Performance Parameters is set to G.826 or G.828+G829,
PO (Performance Objective) limit is displayed for ES, SES, and BBE
respectively. PO limit is the calculated value by multiplying allocation in
Performance Parameters by the Performance Objective defined in ITU
Recommendation.
When the measured value is equal to, or less than PO limit, the result is judged
as Pass.
When the standard of Performance Parameters is set to M.2101.1, BIS
(Bringing-Into-Service) limit is displayed as the Performance Objective.
BIS limitBIS limit
ItemsItems DefinitionDefinition
S1-ES
The ES threshold for deciding Accepted
S2-ES
The ES threshold for deciding Unaccepted
S1-SES
The SES threshold for deciding Accepted
S2-SES
The SES threshold for deciding Unaccepted
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