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Maintenance Description
9-50 Issue 3 June 2001
Errored Seconds (ES) 9
An "errored second" is a second that is not an "unavailable second" in which one
or more V5 parity violations or an AIS or LOP is detected. This parameter is
counted and thresholded independently for each VT1.5 path terminated by the
system.
Severely Errored Seconds (SES) 9
A "severely errored" second is a second that is not an "unavailable second" in
which four or more V5 violations or an AIS or LOP is detected. SES are counted
and thresholded separately for each VT1.5 path terminated by the system.
Unavailable Seconds (UAS) 9
A VT1.5 path is considered "unavailable" from the beginning of X consecutive
SES until the beginning of Y consecutive seconds, none of which is severely
errored. X is equal to 10 seconds or, in the case of a failure, the VT signal failure.
Y is equal to 10 seconds of no SES or VT signal failure. If there is an unprotected
VT path terminating equipment failure, UAS are counted from within 1 second of
circuit pack failure to within 1 second of circuit pack recovery.
DS1 Path Parameters 9
Performance Monitoring Enabling 9
Collection of DS1 path parameters are initiated only when a slot is equipped with
a DS1PM circuit pack (assuming associated MXRVO or STS1E circuit packs are
present), the DS1 port is in the IS or NMON state, and the DS1 port is provisioned
for PM. Parameters continue to be available in reports and generate appropriate
TCAs until the input signal to the DS1 interface is removed and the update
command or the UPD/INIT button is pressed. Alternatively, the DS1 path
parameter can be disabled by setting the DS1 port to turn off DS1PM by using the
set-t1 command.
DS1 path parameters are also applicable to the TMUX when the individual DS1s
are provisioned for PM by the set-t1 command.
Errored Seconds (ES) 9
An "errored second" for a DS1 SF format is a second in which one or more FEs
(frame errors), or a DS1 AIS, or a DS1 OOF is detected. A near-end "errored
second" for a DS1 ESF path is a second in which one or more CRC-6 violations,
or a DS1 AIS, or OOF is detected. ES are not counted during "unavailable
seconds." For a DS1 path with the ESF format, the far-end "errored seconds"
values are obtained from the performance report message (PRM) in the DS1 ESF
data link.
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