Parameter Name Definition
TMP Total Measurement Period Elapsed time in current interval
Definitions of PM Parameters for SHDSL
For SHDSL, a performance monitoring block coincides with an SHDSL frame. Since
the SHDSL frame length is 6 ms, there are 1662/3 blocks per second. The following
definitions are applicable for PM parameters that are used for SHDSL segment
termination points:
• UAS:
Each second that is part of unavailable time is counted as a UAS. Unavailable time
starts after ten consecutive SESs. These 10 seconds are part of unavailable time.
Unavailable time stops after ten consecutive non-SESs. These 10 seconds are not
part of unavailable time.
• SES:
Each second in which 50 or more CRC-6 words are in error or in which a LOSW
defect is active is counted as a Severely Errored Second, provided the second is not
a UAS. An SES detection threshold of 30% is equivalent to 50 errored blocks.
• ES:
Each second in which one or more CRC-6 word is errored or in which a LOSW
defect is active is counted as an Errored Second, provided the second is not a UAS.
• BBE (CV):
Each SHDSL frame with an errored CRC-6 word is counted as a Background
Block Error (Code Violation), provided the second in which the error occurs is not
an SES or a UAS. Hence, the maximum possible number of BBEs per second is
49.
Ranges and default thresholds
These are the ranges and default thresholds for SHDSL performance monitoring:
Parameter 15-minutes bin 24-hours bin
Range Raise
threshold
Clear
threshold
Range Raise
threshold
Clear
threshold
BBE 0 - 45000 3000 15 0 - 4320000 4000 400
ES 0 - 900 120 5 0 - 86400 350 35
SES 0 - 810 15 0 0 - 77760 20 0
UAS 0 - 900 15 0 0 - 86400 20 0
The default thresholds are fix preset and cannot be changed.
Plotted performance diagram
In the figure below an example is given how ES, SES, UAS, and BBE are computed.
The number of errored blocks are plotted against time.
Performance monitoring
Available PM data
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10-32
Alcatel-Lucent - Proprietary
See notice on first page
365-312-807R7.2
Issue 4, May 2007
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