363-206-285
Maintenance Description
Issue 3 June 2001
9-51
Severely Errored Second (SES) 9
For the DS1 SF format, a "severely errored second" is a second in which eight or
more FEs are detected, or an OOF, or DS1 AIS is detected. For the DS1 ESF
format, a near-end SES is a second in which 320 or more CRC-6 violations, or a
DS1 AIS, or DS1 OOF are detected. For a DS1 path with the ESF format, the far-
end "severely errored seconds" values are obtained from the PRM in the DS1
ESF data link. SES are not counted during "unavailable seconds." For a DS1 path
with ESF format, the far-end "severely errored seconds" values are obtained from
the PRM.
Unavailable Seconds (UAS) 9
A DS1 path is considered "unavailable" from the beginning of 10 consecutive SES
until the beginning of 10 consecutive seconds, none of which is severely errored.
If there is a DS1 pack failure, then UAS are counted from within 1 second of circuit
pack failure to within 1 second of circuit pack recovery. UAS are counted and
thresholded separately for each DS1 path monitored by the system.
For a DS1 path with ESF format, the far-end "unavailable second" performance is
obtained from the PRM.
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.
DS1 Line Parameters 9
ES-L Errored Seconds 9
This parameter is a count of seconds containing one or more bipolar violations (for
both AMI and B8ZS types of coding) or one or more LOS defects from the DSX-1.
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