Lucent Technologies LambdaXtreme Alarm Messages And Trouble Clearing Manual page 385

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L L-Band (Long Band)
A dispersion-shifted fiber range of 1570 to 1610 nm, where a wide range of wavelengths are
possible with low loss. L-Band doubles the number of wavelengths best suited in DWDM
applications and uses newer, more expensive optical amplifiers. In LambdaXtreme Transport, the
L-Band is widened and referred to as an Extended L-Band.
LAN (Local Area Network)
1. A communication link between two or more points within a small geographic area, such as
between buildings. 2. A data network which has a size of normally up to 10 km. Important
LANs are Ethernet, Token Ring, Token Bus and FDDI.
LAPD (Link Access Protocol on D-channel)
A special protocol of the OSI Data Link Layer, which provides the functional and procedural
means to establish, maintain, and release data link connections for NEs. For NE-NE
communications over the DCC, Layer 2 services are provided by LAPD.
Launch Fiber
An optical fiber used to couple and condition light from an optical source into an optical fiber
Often the launch fiber is used to create an equilibrium mode distribution in multimode fiber.
Also called launching fiber.
LBC (Laser Bias Current)
Current that runs through the laser to make it work. LBC is monitored by performance
monitoring. If the current goes beyond a certain threshold, it means that the circuit pack must
be replaced.
LBO (Line Build Out)
Attenuation used to simulate a load.
LC (Lucent Connector)
A small-form-factor (SFF) design based on a proven 1.25 mm ceramic ferrule. This connector
uses RJ-style latching. It facilitates high-speed applications with lower power requirements due
to lower insertion loss (0.1 dB typical) and higher return loss (55 dB single mode).
LD (Laser Diode)
A semiconductor that emits coherent light when forward biased.
LEAF (Large Effective Area Fiber)
A type of fiber manufactured by Corning.
LED (Light-emitting diode)
Diodes which translate electrical current into light. Made out of semiconductor material like
Gallium-Arsenide; a semiconductor that emits incoherent light when forward biased.
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365-575-783R1.1
Issue 1, June 2002
Lucent Technologies - Proprietary
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