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fiber. DCMs are necessary for very-long-haul applications and high bit rates.
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
ECI
Electrical Connection Interface
EMC
Electro-Magnetic Compatibility
EMS
Element Management System
EPROM
Erasable Programmable Read-Only Memory
Glossary
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365-374-187
Issue 1, December 2005
Lucent Technologies - Proprietary
See notice on first page
GL-3