LOS
UAT
Unavailable Time
When SES or ALS continues for ten seconds, UAT starts from the
beginning of the time. When items other than SES continues for ten
seconds, UAT ends at one second before the time. Refer to the figure of
Example of Unavailable Time Detection.
First, the time (when determining the start of UAT) is not counted as
UAT, and then if determined, the UAT is recounted.
First, the time (when determining the end of UAT) is counted as UAT,
and then if determined, the UAT is recounted. In a word, the values of
UAT may be reduced later. The same is applied to other items.
AVT
Available Time
The available time of the measurement
S
Avail
=S
Total
-S
Unavail
EFS
Error Free Second
Within S
Avail
, the number of seconds during which no errors occurred.
*: Appears when the standard of Performance Parameters is set to G.826.
Example of Unavailable Time Detection
The performance objectives defined in ITU Recommendation are shown in the
following table. When the measured value is equal to or less than these values,
the cell is displayed in green.
Performance ObjectivesPerformance Objectives
ItemsItems G.821G.821 G.826G.826 M.2100M.2100
ES Ratio 0.08 0.04 0.02
SES Ratio 0.002 0.002 0.001
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