User`s guide

Monitoring and Managing the DL3100 5-19
5
RFC 1407 Statistics Descriptions
Table 5-3 describes the statistics for RFC 1407.
Table 5-3 RFC 1407 Statistics Detail
Statistic Type Description
P-bit Errored Seconds (PES) A PES is an occurrence of one or more PCVs, one or more OOFs,
or detection of an incoming AIS within a 1-second time frame.
This gauge is not incremented when UASs are counted.
P-bit Severely Errored
Seconds (PSES)
A PSES is an occurrence of 44 or more PCVs, or one or more
OOFs, or detection of an incoming AIS within a 1-second time
frame.
This gauge is not incremented when UASs are counted
Severely Errored Framing
Seconds (SEFS)
A SEFS is an occurrence of one or more OOFs, or detection of an
incoming AIS within a 1-second time frame.
Unavailable Seconds
(UAS)
Number of seconds that the interface is unavailable. The DS3
interface becomes unavailable at either the onset of 10 contiguous
PSESs or the condition leading to a failure (see Failure States). If
the condition leading to the failure is immediately preceded by one
or more contiguous PSESs, then the DS3 interface unavailability
starts from the onset of these PSESs.
Once unavailable, and if no failure is present, the DS3 interface
becomes available at the onset of 10 contiguous seconds with no
PSESs.
Once unavailable, and if a failure is present, the DS3 interface
becomes available at the onset of 10 contiguous seconds with no
PSESs, if the failure clearing time is less than or equal to 10
seconds.
If the failure clearing time is more than 10 seconds, the DS3
interface becomes available at the onset of 10 contiguous seconds
with no PSESs, or the onset period leading to the successful
clearing condition, whichever occurs later. With respect to the DS3
error counts, all counters are incremented while the DS3 interface
is deemed available. While the interface is deemed unavailable,
the only count that is incremented is UASs. A special case exists
when a period of 10 seconds or greater crosses the 900 second
statistics window boundary, as the foregoing description implies
that the PSES and UAS counters must be adjusted when the
Unavailable Signal State is entered.
Clearly, successive gets of the affected dsx3IntervalPSESs and
dsx3IntervalUASs objects will return differing values if the first get
occurs during the first few seconds of the window. This is viewed
as an unavoidable side-effect of selecting the presently defined
managed objects as a basis for this memo.