Loss of clock (loc), Loss of frame (lof), Loss of frame count (lofc) – Verilink AS2000: The Basics (880-502981-001) Product Manual User Manual
Page 151: Loss of frame second, Lofs)
Acronyms and Definitions
Verilink Access System 2000: Basics
Glossary-31
Loopback A
A diagnostic loopback DTE or a
test set initiates at a HSSI interface.
The DTE signal is looped back
toward the DTE at the HSSI port.
Loopback B
A diagnostic loopback DTE or a
test set initiates at a HSSI interface.
The DTE signal is transmitted to
the DCE framer and looped back
toward the DTE.
loopback
A method of checking the accuracy
of a data transmission in which the
transmitted data is returned to its
source for comparison. Loopbacks
can be initiated from various
points along the circuit to isolate
the source of any errors. Service is
temporarily halted while a
loopback is in place.
LOS
See
.
loss of clock (LOC)
A critical failure/major error in
signal transmission.
loss of frame (LOF)
This alarm is declared when a 3-
alarm is cleared when at least 10
seconds of continuous non-LOS or
non-LOF condition exists.
loss of frame alignment (LOFA)
An E1 error condition that occurs
when the frame alignment signal
of the incoming data stream is not
detected by the receiving device.
loss of frame second (LOFS)
LOFS is the total number of
seconds that the CSU was in the
state.
loss of frame count (LOFC)
An accumulation of the number of
times a loss-of-frame alarm is
declared.
loss of signal (LOS)
The status of a network line when
no bits are detected on input to
the receiving equipment. The time
for detection of loss of signal will
vary depending on the type of
equipment used. The loss of signal
is then integrated into an LOS
alarm after 3 seconds of
continuous loss-of-signal state.
This is the most severe possible
alarm condition.
loss of signal second (LOSS)
A second during which the CSU
state.