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for use in multi-wavelength systems.
L
LCD
liquid crystal display. A display medium made of liquid crystal. Liquid crystal's reflectance
changes when an electric field is applied. Commonly used in monitors, televisions, cell
phones, digital watches, etc.
LCI
local craft interface.
LED
light-emitting diode. An electronic device that lights up when electricity passes through it.
M
MIB
Management Information Base. SNMP collects management information from devices on the
network and records the information in a management information base. The MIB
information includes device features, data throughput statistics, traffic overloads, and errors.
N
nm
nanometer. One billionth of a meter.
NMS
network management system. A software system designed specifically to monitor a network
and to facilitate troubleshooting.
O
OMI
optical modulation index, expressed in decimal or percentage notation.
P
PLL
phase lock loop. An electronic servo system controlling an oscillator to maintain a constant
phase angle relative to a reference signal.
Q
QAM
quadrature amplitude modulation. An amplitude and phase modulation technique for
representing digital information and transmitting that data with minimal bandwidth. Both
phase and amplitude of carrier waves are altered to represent the binary code. By
manipulating two factors, more discrete digital states are possible and therefore larger binary
schemes can be represented.
Glossary
101
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Table of Contents
Troubleshooting
