EXFO FTB-8510B Guia Del Usuario página 1158

Common Tabs
Performance Monitoring (PM)
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.
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.
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
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
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.
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FTB-8100 Series Transport Blazer