Verilink APS 2000 T1 Line Protection (880-502411-001) Product Manual - Manual (Page 63)

Performance Monitoring
Verilink APS 2000 User Manual 4-11
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 CSU receives an AIS from the
network.
Remote Alarm
Indication Second
(RAIS)
This is a second during which the CSU detects an RAI (Yellow
Alarm) from the network.
Bit Error Rate
Alarm Second
(BERS)
This is a count of each second during which a network BER alarm
condition existed.
Loss of frame
Second (LOFS)
An LOFS is a count of each second in which the CSU was in a LOF
state.
Out-of-Frame
Second (OOFS)
An OOFS is a second experiencing one or more OOF events.
Equipment Low-
Density Second
(DTED)
This is a second during which a low-density state occurs and the
CSU stuffs a ONE into the signal from the equipment to maintain
minimum ONEs density on the DS-1 network. The CSU also records
a DTED whenever it applies a keep-alive signal to the network.
Equipment Bit
Error Rate Alarm
Second (DBER)
This is a second during which the incoming bit error rate from the
equipment exceeds the operator-defined threshold.
Equipment Errored
Second
This is the same as the ES previously described, except that it is
detected on the incoming signal from the DS-1 equipment.
Equipment UAS,
ES-L, and OOFS
These are the same as the UAS, ES-L, and OOFS previously
described, except that they are detected on the incoming signal
from the DS-1 equipment.
Performance
data processing
The CSU circuits store and process the DS-1 performance data
described above in three stages, or strata. The following sections