363-206-305
Maintenance Description
Issue 3 June 2000
9-33
Unavailable Seconds (UAS)
9
A VT1.5 path is considered "unavailable" from the beginning of X consecutive
severely errored seconds 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 severely errored seconds or VT
signal failure. If there is an unprotected VT path terminating equipment failure,
unavailable seconds 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 is initiated only when a slot is equipped with a
DS1PM circuit pack, the DS1 port is in the IS or NMON state, and the DS1 port is
provisioned for performance monitoring. Parameters continue to be available in
reports and generate appropriate threshold crossing alerts 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.
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. Errored seconds 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.
CV-P Coding Violations
9
This indicates the number of DS1 near-end path coding violations during the data
collection interval. For a DS1 in SF format, this is a count of framing bit errors. For
a DS1 in ESF format, this is a count of CRC-6 bit errors.
CV-PFE Coding Violations
9
This indicates the number of DS1 far-end path coding violations during the data
collection interval. This parameter is only applicable to a DS1 signal in ESF
format. This is a count of CRC-6 bit errors as reported in the G bits of the PRM.
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