Maintenance Description
9-86 Issue 8.0 July 2002
OC-48/OC-12/OC-3 Line Parameters 9
The following OC-48, OC-12, and OC-3 line parameters are monitored:
â– Line (B2) Coding Violations (CV-L): To monitor the performance of the
OC-48, OC-12, or OC-3 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. The contents of the B2 parity
violation counters associated with the OC-48, OC-12, or OC-3 line are
added to form a composite B2 parity violation count.
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 a line AIS defect
detected.
â– Line (B2) Severely Errored Seconds (SES-L): A severely errored second
(SES) is a second in which there are 494 or more B2 parity violations or a
line AIS defect is detected.
â– Line (B2) Unavailable Seconds (UAS-L): An unavailable second (UAS-L)
is a second during which the OC-48, OC-12 or OC-3 line is "unavailable."
Unavailable seconds are counted after 10 consecutive line (B2) severely
errored seconds (SES-L). 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.
â– Protection Switch Counts (PSC-L): The protection switch count (PSC-L)
parameter is the number of times that a protection switch has been
performed. This count includes the actual automatic and manual switches
(not switch requests) to protection and the revertive switches back to
service.
A threshold crossing alert (TCA) is generated if an OC-48, OC-12, or OC-3 line
parameter exceeds the provisionable threshold. (The protection switch counts
parameter does not have a provisionable or fixed threshold.) The generation of
TCAs can be enabled or disabled using the PERFORMANCE-Set-PM
Threshold-Line input.
To Next Page
Loading...
Need help?
General