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9123-A2-GB20-00
May 2000
The following performance statistics are collected for ESF line conditions.
Statistic
What It Indicates
Errored Seconds (ES) Any second with one or more ESF Error events.
Unavailable Seconds
(UAS)
Any second in which service is unavailable. Begins
incrementing at the onset of 10 consecutive seconds of
severely errored seconds (SES), and stops incrementing after
10 consecutive seconds of no SESs.
Severely Errored
Seconds (SES)
Any second with 320 or more CRC errors or one or more
Out Of Frame (OOF) events.
Bursty Errored
Seconds (BES)
Any second with more than one, but less than 320 CRC errors.
Controlled Slip
Seconds (CSS)
Any second with one or more controlled slips (a replication or
deletion of a DS1 frame by the receiving device). This is
collected for network performance statistics only.
Loss of Frame Count
(LOFC)
The number of Loss of Frame conditions.
Worst Interval The largest number of seconds for either ES, UAS, SES, BES,
or CSS, or the greatest Loss of Frame Count (LOFC).
If more than one interval contains the same worst value, then
the oldest interval is displayed.