363-206-295
Maintenance Description
9-36 Issue 1 December 1997
Severely Errored Seconds (SES) 9
A SES is a second in which 12 or more B2 parity violations are detected or one in
which a LOS, LOF, or line AIS occurs. A UAS is not counted as a SES. SES are
counted and thresholded for the EC-1 line.
Unavailable Seconds (UAS) 9
A UAS is a second during which the EC-1 line is "unavailable." A line 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 line signal failure. Y is equal to 10
seconds of no SES or line signal failure. If there is an unprotected circuit pack
failure, UAS are counted from within 1 second of circuit pack failure to within 1
second of circuit pack recovery. UAS are counted and thresholded for the EC-1
line.
Line Protection Switch Counts 9
Line protection switch counts do not apply to EC-1 interfaces.
STS-1 Path Parameters 9
Performance Monitoring Enabling 9
Collection of STS-1 path parameters is initiated only when a slot is equipped with
a 3DS3 circuit pack. Parameters continue to be available in reports and generate
appropriate TCAs until the 3DS3 circuit pack is removed and the update
command or the UPD/INIT button is pressed. Path parameters are monitored only
on active circuit packs.
STS-1 Path Coding Violations (B3 Parity) 9
The performance of the STS-1 path is monitored by writing the "B3" byte in the
STS-1 path overhead when the path is originated and checking the "B3" byte for
errors when the path is terminated. The B3 coding violation counter is
incremented for each error detected. Up to eight errors per STS-1 frame can be
detected in each STS-1 synchronous payload envelope (SPE). B3 coding
violations are counted and thresholded separately for each STS-1 path
terminated by the system. CVs are not counted during seconds that contain a line
AIS, LOS, LOF, LOP, STS path AIS, or during a UAS. The B3 parity violations are
counted and thresholded for each STS-1 path terminated by the system.
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