Verilink AS2000: The Basics (880-502981-001) Product Manual - Manual (Page 77)

Monitoring and Troubleshooting
Verilink Access System 2000: The Basics 5-11
Performance Monitoring Registers
The statistics logged into the performance monitoring registers is
used to determine how long a fault has existed, and the type,
location, and severity of the fault.
Performance
Register
Definitions
The application module uses error events to derive additional
performance data. This data is stored in registers and can be
retrieved by your management software. The performance data
meets the requirements of AT&T TR-54016, ANSI T1M1.3, and
international standards. Verilink-defined data is also gathered and
stored for operator retrieval. See
Table 5-5 for a summary of all
performance register acronyms at the end of this section.
ESF Error Event (T1 only)
An ESF error event is an extended superframe that contains at least
one CRC-6 error event or Out of Frame (OOF) event. ESF error
events are used to derive Errored Seconds, Severely Errored
Seconds, Bit Error Rate, Unavailable Signal State, Unavailable
Seconds, and Bursty Errored Seconds.
Errored Second (ES)
An ES is a second with at least one ESF error event. However,
errored seconds are not counted when Unavailable Seconds (UAS)
are counted.
Bursty Errored Second (BES)
A bursty errored second is a second with 2 to 319 CRC-6 error
events. Bursty errored seconds are not counted when an SES or
UAS is counted.
NOTE: Bursty Errored Seconds are referred to as Errored Seconds-
Path (ES) in the ANSI T1M1.3 performance standard.
Severely Errored Second (SES)
An SES is a second with 320 or more CRC-6 error events, or one or
more OOF events. Severely errored seconds are not counted when
UAS are counted.