Verilink HDM 2182 (880-502925-001) Product Manual - Manual (Page 75)

Troubleshooting
Verilink HDM 2182 User Manual 6-5
second integration period upon detection of LOS or LOF before
a yellow alarm is sent to the far-end equipment. This condition
is also referred to as a Yellow Alarm.
•
Alarm Indication Signal (AIS)—Using an unframed all-ones bit
pattern, an AIS alarm indicates that an alarm condition exists
upstream in a circuit leading to the downstream equipment.
This is also called an All-Ones Keep-Alive or Red Alarm Signal.
An AIS defect is declared when there are 3 or fewer zeros in
512 bit times and an LOF defect. It is cleared when there are 3
or more zeros in two frames or the LOF defect no longer exists.
•
C-bit Coding Violation (CCV)—An error event that reflects the
occurrence of received CP-bit parity errors during the
accumulation interval. The CP-bits are not affected by
customer-owned equipment and are therefore more accurate
than P-bit parity.
•
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.