Verilink AS2000: The Basics (880-502981-001) Product Manual Instrukcja Użytkownika Pobierz pdf (Strona 151)

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 signal (LOS)

loss of clock (LOC) A critical failure/major error in

signal transmission.

loss of frame (LOF) This alarm is declared when a 3-

second interval of continuous

out-

of-frame (OOF)

loss of signal

(LOS)

state is detected. An LOF

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

loss of signal (LOS)

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

was in a

loss of signal (LOS)

state.

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