Verilink AS2000: The Basics (880-502981-001) Product Manual - Manual (Page 78)

Monitoring and Troubleshooting
5-12 Verilink Access System 2000: The Basics
Unavailable Signal State (UASS)
The application module retroactively declares a UASS at the onset
of 10 consecutive SESs and clears the UASS at the onset of 10
consecutively non-severely errored seconds. The UASS is
equivalent to a Failed Signal State (FSS).
Unavailable Second (UAS)
The application module declares a UAS for any second during
which a UASS exists. An unavailable second is equivalent to a
Failed Second (FS).
Loss of Frame Count (LOFC)
An LOFC is an accumulation of the number of times an LOF is
declared. A loss of frame is declared when an LOS or OOF occurs
continuously for 2 to 3 seconds, and is cleared after 10 seconds
without a LOS or OOF event.
Errored Second-Line (ES-L)
An AMI ES-L is a second in which one or more bipolar violations are
received from the network. A B8ZS ES-L is declared when a bipolar
violation is received that is not part of a B8ZS substitution pattern.
Severely Errored Framing Second (SEFS)
An SEFS is a second experiencing one or more events of two or
more frame bit errors in a 3-millisecond period.
Loss of Signal Second (LOSS)
An LOSS is a second in which an LOS condition exists.
Alarm Indication Signal Second (AISS)
An AISS is a second in which the application module receives an AIS
from the network.
Remote Alarm Indication Second (RAIS)
This is a second during which the application module detects an
RAI (Yellow Alarm) from the network.