EXFO FTB-8510B Guia Del Usuario página 1162

Common Tabs
Performance Monitoring (PM)
UAS (Unavailable Second): Gives the count of the seconds
corresponding to the period 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.
512
ESR (Errored Second Ratio): Gives the ratio of the number of ES in
available time to total seconds in available time during a fixed
measurement interval.
ESR = ES ÷ AS
SESR (Severely Errored Second Ratio): Gives the ratio of the
number of SES in available time to total seconds in available time
during a fixed measurement interval.
SESR = SES ÷ AS
BBER (Background Block Error Ratio): Gives the ratio of BBE in
available time to total blocks in available time during a fixed
measurement interval. The count of total blocks excludes all
blocks during SESs.
FTB-8100 Series Transport Blazer