Verilink C100 (880-502893-001) Product Manual - Manual (Page 85)

Performance Monitoring with the Console Port
06/17/97 C100 and C150 T1/FT1 CSU/DSU 8-9
The Network Interface (TelCo) counters can be reset only by removing
power from the unit.
The DSX-1 Customer Interface counters can be reset by pressing the
letter “r”. The section below is a description of the counters and
statistics.
Counters and
Statistics ESF Err Event
Displays the number of ESF Errored Events. An ESF Error Event is
determined by logical ORing of a CRC6 error and the occurrence of an
OOF (Out Of Frame).
CRC6 Errors
Displays the number of CRC6 Errors. A CRC6 Error occurs when the
CRC6 field calculated on the incoming Network signal does not agree
with the CRC6 field contained in the received signal from the
Network.
Errored Secs
Displays the number of Errored Seconds. An Errored Second is a
second with one or more CRC6 errors or one or more OOFs.
Unavail Secs
Displays the number of Unavailable Seconds. An Unavailable Second
is a second during which service is not available.
Sev Errd Secs
Displays the number of Severely Errored Seconds. A Severely Errored
Second is a second with 320 or more CRC6 errors or one or more
OOFs.
Bur Errd Secs
Displays the number of Bursty Errored Seconds. A Bursty Errored
Second is a second with more than one but less than 320 CRC6 errors.