Verilink HDM 2180 (880-503048-001) Product Manual - Manual (Page 73)

Troubleshooting
Verilink HDM 2180 User Manual 6-5
• C-bit Errored Second (CES)—A CES is a second with one or
more CCVs or one or more Out of Frame (OOF) defects or a
detected incoming AIS. This gauge is not increased when UASs
are counted.
• Alarm Indication Signal Second (AISS)—A second when the
CSU receives an unframed all-ones alarm indication signal
(AIS) from the network.
• Line Coding Violation (LCV)—An LCV error event is a count of
both bipolar violations (BPVs) and excessive zeros (EXZs)
occurring over the accumulation period. An EXZ increments
the LCV by one regardless of the length of the zero string.
• Line Errored Second (LES)—An LES is a second in which one or
more LCVs occurred or one or more LOS defects.
• Loss of Signal Second (LOSS)—A second during which the CSU
is in a Loss of Signal (LOS) state.
• P-bit Coding Violation (PCV)—A P-bit parity error event is the
occurrence of a received P-bit code on the DS3 M-frame that is
not identical to the corresponding locally-calculated code.
• P-bit Errored Second (PES)—A PES is a second with one or
more P-bit Coding Violations (PCVs) or one or more Out of
Frame defects or a detected incoming AIS. This gauge is not
increased when Unavailable Seconds (UASs) are counted.