User`s manual

Chapter 4 Monitoring and Maintenance
89
The performance parameters defined for MUXpro statistics are listed below:
Table 4-4 PM Messages
CV
BIP-8 errors，
RS：B1 byte
MS：B2 bytes
Path：B3 byte
VC：BIP-2 in the V5 byte
ES At each layer, an Error Second (ES) is a second with one or more
Coding Violations at that layer OR one or more incoming defects (e.g.,
SEF, LOS, AIS, LOP) at that layer has occurred.
SES A Severely Error Second (SES) is a second with x or more CVs at that
layer, or a second during which at least one or more incoming defects at
that layer has occurred.
SEFS A Severely Error Framing Second (SEFS) is a second containing one or
more SEF events.
UAS An unavailable second is calculated by counting the number of seconds
that the interface is unavailable.
The SONET/SDH interface is set to be unavailable at the onset of 10
contiguous SESs.
Once unavailable, the SONET/SDH interface becomes available at the
onset of 10 contiguous seconds with no SESs.
A special case exists when the 10 second period leading to available or
unavailable time crosses a 900 second statistics window boundary, as
the foregoing description implies that the CV, ES, SES, SEFS, and UAS
counts the PREVIOUS interval must be adjusted.
Figure 4-8 15 Mins Statistics Current