DS3 Alarms/Errors Alarms
Errors
DS3 Performance FAS errors
Pattern errors
*1: Frequency results appear only when no OTN layer.
*2: JustificationJustification appears when 'PDH Rx' or 'DSn Rx' is selected.
*3: E-Bit errorsE-Bit errors appears when 'E-bit' is set to On in Frame tab of E1 receiver.
*4: CRC6 errorsCRC6 errors appears when 'ESF' or 'J1' is selected.
SDH/SONET Performance Measurement ItemsSDH/SONET Performance Measurement Items
This paragaraph describes the performance result items.
EB (Errored Block) is defined as:
A block in which one or more errors occurred
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
Severly 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
Unavalable 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 BE 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.
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