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Appendix F: Using the LineStatus Utility
iSPAN PRI PCI ISDN Users Guide
113
Statistics Parameters
The following statistics fields display performance parameters 
accumulated during the last 24 hours the interface is running:
Parameter
Meaning
Uptime
Length of time that the interface has been running.
UnAvailable 
Seconds 
(Also known as UAS). Number of seconds that the 
interface is unavailable. The DS1 interface is considered 
unavailable from the onset of 10 contiguous SESs, or the 
onset of the condition leading to a failure. 
Errored 
Seconds
(Also known as ES). Number of seconds during which any 
the following have existed:
•  One or more PCV
•  One or more LOF
•  One or more CS
•  Detected AIS defect
Severely 
Errored 
Seconds
 (Also known as SES). For ESF signals, number of seconds 
during which any of the following have existed:
•  320 or more PCVs
•  One or more LOFs
•  Detected AIS defect
CSs are not included in this parameter.