363-206-305
Maintenance Description
Issue 3 June 2000
9-29
Severely Errored Frame Seconds (SEFS)
9
This parameter counts the number of seconds during which an out-of-frame, loss-
of-signal, or OLIU circuit pack failure occurred. SEFSs are counted and
thresholded independently for each OC-1/OC-3/OC-12 interface.
OC-1/OC-3/OC-12 Line Parameters
9
Performance Monitoring Enabling
9
Collection of line parameters for OC-1/OC-3/OC-12 interfaces is initiated when a
slot is equipped with an OLIU circuit pack. Parameters continue to be available in
reports and generate appropriate threshold crossing alerts until the OLIU is
removed and the
update
command or the UPD/INIT button is pressed.
Line Coding Violations (B2 Parity)
9
To monitor the performance of the OC-1/OC-3/OC-12 line, the line BIP-8 (B2
parity) is calculated, written, and checked for errors. The line B2 parity violation
counter is incremented for each line BIP error detected. Each line BIP-8 can
detect up to eight errors per STS-1 frame. The contents of the 3 or the 12 line B2
parity violation counters associated with the OC-3 or OC-12 line are added to form
a composite B2 parity violation count. Coding violations are not counted during
seconds that contain a line AIS, loss of signal, loss of frame, or during an
unavailable second (UAS). The B2 parity violations are counted and thresholded
independently for service and protection lines.
Errored Seconds (ES)
9
An "errored second" is a second in which one or more B2 parity violations are
detected. An errored second "type A" is a second in which exactly one B2 parity
violation is detected. An errored second "type B" is a second in which more than
one and less than 12 for OC-1, or more than one and less than 32 for OC-3, or
more than one and less than 124 for OC-12, B2 parity violations are detected.
Seconds that are unavailable seconds are not counted as errored seconds. A
second that contains a line AIS, loss of signal, loss of frame or is an unavailable
second is not counted as a type A or type B errored second. All three of these
parameters are counted and thresholded independently for service and protection
lines.
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