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 comp one nts, th e resul ts of m ainten ance te sts, th e
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.
lineA 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.