EXFO FTB-8100 Series, Руководство пользователя

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Common Tabs
SONET/SDH Application
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Performance Monitoring (PM)
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BBE (Background Block Error) ( G.826 , G.828 , G.829 , and M.2101 ):
Gives the count of Errored Block not occurring as part of a SES.
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UAS (Unavailable Second): Gives the count of the seconds
corresponding to the periods of unavailable time that begins at the
onset of 10 consecutive SES events, including these 10 seconds. A
period of available time shall begin at the onset of 10 consecutive
non-SES events, including these 10 seconds.
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ESR (Errored Second Ratio) ( G.821 , G.826 , G.828 , and G.829 ): Gives
the ratio of the number of ES in available time (AS) during a fixed
measurement interval.
ESR = ES ÷ AS
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SESR (Severely Errored Second Ratio) ( G.821 , G.826 , G.828 , and
G.829 ): Gives the ratio of the number of SES in available time (AS)
during a fixed measurement interval.
SESR = SES ÷ AS
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BBER (Background Block Error Ratio) ( G.821 , G.826 , G.828 , and
G.829 ): Gives the ratio of BBE in available time (AS) to total blocks in
available time during a fixed measurement interval. The count of total
blocks excludes all blocks during SESs.