Nortel 2000 Software Reference Manual page 210

Chapter 3 Using the CLI Commands
Remote Annex Administrator's Guide for UNIX
Book C-192
Table C-64. The stats -T Command Display (continued)
Field Description
DII Sync When DII Sync is true, the Drop/Insert Interface is
receiving ones pulses and is in frame sync. When DII
Sync is false, the Drop/Insert Interface is out of frame
sync or not receiving pulses and is sending AIS (all ones
unframed).
Interval The 15-minute interval being displayed. This is an integer
from 1 to 96, "current" or "total".
Number of Part of the "current" report which indicates the number of
Valid Seconds seconds for which the statistics data has been collected.
Number of Part of the "total" report which indicates the number of
15-minute valid 15-minute periods. This could also be derived from
Periods the uptime.
Bursty Errored A Bursty Errored Second (BES) is a second with more
Seconds than one, but less than 320 CRC error events.
Controlled Slip A Controlled Slip Second (CSS) is a second with one or
Seconds more Controlled Slips.
Errored An Errored Second is a second with one or more ESF
Seconds error events; that is, one or more CRC error events or one
or more Out of Frames (OOFs).
Severely A Severely Errored Second (SES) is a second with 320 or
Errored more CRC error events or one or more OOFs.
Seconds
Unavailable Unavailable Seconds (UAS) are a count of one second
Seconds intervals during which service is unavailable.
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Book C