363-206-285
Maintenance Description
Issue 3 June 2001
9-49
not counted during seconds that contain a line AIS, LOS, LOF, LOP, STS path AIS, or
during a UAS.
Errored Seconds (ES) 9
An "errored second" is a second in which one or more B3 parity violations are detected.
Seconds that are UAS are not counted as ES. An ES "type A" is a second in which
exactly one B3 parity violation is detected. An ES "type B" is a second in which more
than one and less than nine B3 parity violations are detected. All three of these
parameters are counted and thresholded independently for each STS-1 path
terminated by the system.
Severely Errored Seconds (SES) 9
An SES is a second in which nine or more B3 parity violations are detected. SES are
counted and thresholded separately for each STS-1 path terminated by the system. A
UAS is not counted as an SES.
Unavailable Seconds (UAS) 9
An STS-1 path is considered "unavailable" from the beginning of X consecutive SES
until the beginning of Y consecutive seconds, none of which is severely errored. X is
equal to 10 seconds or, in the case of a failure, the STS signal failure. Y is equal to 10
seconds of no SES or STS signal failure. If there is an unprotected STS-1 path
terminating equipment failure (STS1E, MXRVO, DS3, TMUX, or OLIU), UAS are
counted from within 1 second of circuit pack failure to within 1 second of circuit pack
recovery.
VT1.5 Path Parameters 9
Performance Monitoring Enabling 9
â– EC-1 High-Speed Interfaces
For EC-1 high-speed, VT1.5 monitoring is initiated when a DS1 slot is equipped
with a DS1 or DS1PM circuit pack (assuming an associated STS1E circuit pack
set for high-speed is present). Parameters continue to be available in reports and
generate appropriate TCAs until the DS1 or DS1PM circuit packs are removed
and the update command or the UPD/INIT button is pressed.
â– OC-3 Interfaces
VT1.5 monitoring is initiated when the associated VT1.5 or STS-1 cross-
connection is made to a DS1 or DS1PM circuit pack. Parameters continue to be
available in reports and generate appropriate TCAs until the VT1.5 or STS-1
cross-connection is deleted.
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