DCN
Data Communications Network
DCrtn
Direct Current return
Default
An operation or value that the system or application assumes, unless a user makes an explicit
choice.
Disassembly
Splitting up a signal into its constituents as payload data and overhead (an indication of the
direction of a signal).
Dispersion
Time-broadening of a transmitted light pulse.
Dispersion Shifted Optical Fiber
1330/1550 nm minimum dispersion wavelength.
Drop-Down Menu
A menu that is displayed from a menu bar.
DS1
1.5 Mbps interface
DUR
Dual Unit Row
DWDM
Dense Wavelength Division Multiplexing
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E
EMC
Electro-Magnetic Compatibility
EMS
Element Management System
EPROM
Erasable Programmable Read-Only Memory
ESD
Electrostatic Discharge
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365-374-074
Issue a, April 2002
Lucent Technologies
G L O S S A R Y
G L - 3