S
Total
Total measurement time. This is the total time of the measurement excluding
the time of power failure.
S
Avail
Available time of measurement. Calculated from the following formula:
S
Avail
=S
Total
-S
Unavail
S
Unavail
Unavailable time of measurement. Refer to UAT definition.
M.2100 Performance ParametersM.2100 Performance Parameters
ItemsItems DefinitionDefinition
ES
Errored Second
Within S
Avail
, the number of seconds during which one or more pattern
errors occurred.
SES
Severely Errored Second
Within S
Avail
, the number of seconds during which any of the following is
detected.
10
-3
or more pattern errors
LOF
LOS
ALS
Alarm Second
Within S
Avail
, the number of seconds during which any of the following is
detected.
Link is not established.
Remote Fault
LOF
Errored Frame Count
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.
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