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Glossary and Abbreviations
Issue 5 January 1998 GL-29555-230-024
kbyte
Kilobyte
kg
Kilogram
L
LAN
Local area network
LAP-D
Link Access Procedure on the D-channel
LAPD
Link Access Procedure data
LATA
Local access and transport area
lb
Pound
LBO
Line buildout
LDN
Listed directory number
LDS
Long-distance service
LEC
Local exchange carrier
LED
See light-emitting diode (LED).
light-emitting diode (LED)
A semiconductor device that produces light when voltage is applied. LEDs provide a visual
indication of the operational status of hardware components, the results of maintenance tests, the
alarm status of circuit packs, and the activation of telephone features.
lightwave transceiver
Hardware that provides an interface to fiber-optic cable from port circuit packs and DS1 converter
circuit packs. Lightwave transceivers convert electrical signals to light signals and vice versa.
line
A transmission path between a communications system or CO switching system and a voice
terminal or other terminal.
line appearance
See appearance.
line buildout
A selectable output attenuation is generally required of DTE equipment because T1 circuits
require the last span to lose 15–22.5 dB.