Threshold Termination 15 Minutes 24 Hours
BBE VC-12, VC-11 1,799,100 172713600
VC-4 7,199,100 691113600
MS-1 172,799,100 16588713600
P12 899100 86313600
UAS VC-12 900 86400
VC-4 900 86400
MS-1 900 86400
P12 900 86400
SHDSL performance monitoring
The performance of SHDSL segments that are terminated on the LTU, SRU and NTU
can be monitored. The SHDSL standard (ITU-T Rec. G.991.2) prescribes a set of
parameters that needs to be monitored and stored in 15 minute and 24 hour bins for
near-end Performance Monitoring. The following table provides an overview of the PM
parameters:
Parameter Name Definition
CV/BBE Code Violation/background
Block Error
Each CRC6 anomaly is counted a
CV/BBE during non-SES and
non-UAS seconds
ES Errored Seconds Each second with one or more CRC6
anomaly is counted as an ES, unless
that second is UAS
SES Severely Errored Second Each second with 50 or more CRC6
anomalies (> 30%)or one or more
LOSW events is counted as an SES,
unless that second is UAS
LOSWS Loss of SyncWord Second Each second in which LOSW is
declared as LOSWS
UAS/US Unavailable Second Each second that is part of
unavailable time (UAT) is counted as
UAS. UAT is declared at the begin of
10 consecutive SES and cleared at the
begin of ten consecutive non-SES.
OFS/AIS OOF or AIS Second Second containing ab LOSW or AIS
event
CRC6 CRC6 anomaly Number of CRC6 block errors (same
as BBE, but not inhibited by SES or
UAS)
Performance monitoring
Available PM data
....................................................................................................................................................................................................................................
365-312-807R7.2
Issue 4, May 2007
Alcatel-Lucent - Proprietary
See notice on first page
10-31
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