Lucent Technologies LambdaUnite Installation Manual page 337

Loopback
Type of diagnostic test used to compare an original transmitted signal with the resulting
received signal. A loopback is established when the received optical or electrical external
transmission signal is sent from a port or tributary input directly back toward the output.
LOP (Loss of Pointer )
A failure to extract good data from a signal payload.
LOS (Loss of Signal)
The complete absence of an incoming signal.
Loss Budget
Loss (in dB) of optical power due to the span transmission medium (includes fiber loss and
splice losses).
LPA (Lower order Path Adaptation)
Function that adapts a PDH signal to a synchronous network by mapping the signal into or
de-mapping the signal out of a synchronous container.
LPC (Lower Order Path Connection )
Function that provides for flexible assignment of lower order VCs in a higher order VC.
LPT (Lower Order Path Termination)
Function that terminates a lower order path by generating and adding the appropriate VC POH
to the relevant container at the path source and removing the VC POH and reading it at the path
sink.
LS
Low Speed
LT/RB
Left Top/Right Bottom
LTE
Line Terminating Equipment
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M µm
Micrometer
MAF
Management Application Function
Maintenance Condition
An equipment state in which some normal service functions are suspended, either because of a
problem or to perform special functions (copy memory) that can not be performed while normal
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365-374-059
Issue a, January 2002
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