EC-1 Section/Line Parameters 9
The following EC-1 section/line parameters are monitored:
â– Section (B1) Severely Errored Frame Seconds (SEFS-S): A section
severely errored frame second (SEFS) is the number of seconds during
which an out-of-frame event occurred.
â– Line (B2) Coding Violations (CV-L): To monitor the performance of the
EC-1 line, the line B2 parity is calculated, written, and checked for errors.
The line B2 parity violation counter is incremented for each line bit
interleaved parity (BIP) error detected. Each line BIP-8 can detect up to
eight errors per STS-1 frame.
â– Line (B2) Errored Seconds (ES-L): An errored second (ES) is a second in
which there are one or more B2 parity violations or an EC-1 line AIS defect
detected.
â– Line (B2) Severely Errored Seconds (SES-L): A severely errored second
(SES) is a second in which there are 9 or more B2 parity violations or an
EC-1 line AIS defect detected.
â– Line (B2) Unavailable Seconds (UAS-L): An unavailable second (UAS) is
a second during which the EC-1 line is "unavailable." Unavailable seconds
are counted after 10 consecutive line (B2) severely errored seconds (SES).
These 10 severely errored seconds are counted, and each subsequent
second is counted until there are 10 consecutive seconds without a
severely errored second. The 10 consecutive seconds without a severely
errored second are not counted as unavailable seconds.
A threshold crossing alert (TCA) is generated if an EC-1 section/line parameter
exceeds the provisionable threshold. The generation of TCAs can be enabled or
disabled using the PERFORMANCE-Set-PM Threshold-EC1 input.
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