7. Operation and Maintenance

The following performance statistics are collected for ESF line conditions.

Table 7-21. ESF Line Condition Performance Statistics

Statistic

What It Indicates

 

 

Errored Seconds (ES)

Any second with one or more ESF Error events.

 

 

Unavailable Seconds

Any second in which service is unavailable. Begins incrementing

(UAS)

at the onset of 10 consecutive seconds of severely errored

 

seconds (SES), and stops incrementing after 10 consecutive

 

seconds of no SESs.

 

 

Severely Errored

Any second with 320 or more CRC errors or one or more Out Of

Seconds (SES)

Frame (OOF) events.

 

 

Bursty Errored

Any second with more than one, but less than 320 CRC errors.

Seconds (BES)

 

 

 

Controlled Slip

Any second with one or more controlled slips (a replication or

Seconds (CSS)

deletion of a DS1 frame by the receiving device). This is

 

collected for network performance statistics only.

 

 

Loss of Frame Count

The number of Loss of Frame conditions.

(LOFC)

 

 

 

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.

 

 

7-66

September 2002

9128-A2-GB20-80

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Paradyne CSU, DSU, 9126-II, 9128-II manual Uas, Lofc