363-206-295
Maintenance Description
Issue 1
December 1997
9-35
to 10 seconds of no SES or line signal failure. If there is an unprotected circuit
pack failure, UAS are counted from within 1 second of circuit pack failure to within
1 second of circuit pack recovery. UAS are counted and thresholded
independently for the service and protection lines.
Line Protection Switch Counts
9
Line protection switch count is the count of the number of protection switches
FROM the working line. The count is independently counted and thresholded for
both the service and the protection line. This does not apply to main OC-N lines in
ring releases.
EC-1 Line Parameters
9
Performance Monitoring Enabling
9
Collection of line parameters for EC-1 low-speed interfaces is initiated when a slot
is equipped with a 3STS1E circuit pack and the port is in the IS state. Parameters
continue to be available in reports and generate appropriate TCAs until the input
signal is removed and the
update
command or the UPD/INIT button is pressed.
Alternatively, the EC-1 low-speed line parameters can be disabled by setting the
EC-1 port state to NMON using the
set-state-ec1
command.
Line Coding Violations (B2 Parity)
9
To monitor the performance of the EC-1 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. CVs are not counted during seconds that contain a
line AIS, LOS, LOF, or during a UAS. The B2 parity violations are counted and
thresholded for the EC-1 line.
Errored Seconds (ES)
9
An "errored second" is a second in which one or more B2 parity violations are
detected. An ES "type A" is a second in which exactly one B2 parity violation is
detected. An ES "type B" is a second in which more than one, and less than 12,
B2 parity violations are detected. Seconds that are UAS are not counted as ES. A
second that contains a line AIS, LOS, LOF, or is a UAS is not counted as a type A
or type B ES. All three of these parameters are counted and thresholded for the
EC-1 line.
