DCN
See “data communication network” (p. GL-6) for definition.
dense wavelength division multiplexing (DWDM)
A multiplexing technique that uses close spectral spacing of individual optical carrier wavelengths
to reduce the total number of fibers needed to provide a given amount of information-carrying
capacity. The technique takes advantage of desirable transmission characteristics (for example,
minimum dispersion or attenuation) within a given fiber.
DGEF
See “dynamic gain equalization filter” (p. GL-7) for definition.
DHCP
See “dynamic host configuration protocol” (p. GL-7) for definition.
dispersion
The temporal spreading of a light signal in an optical waveguide caused by light signals traveling
at different speeds through a fiber either due to modal or chromatic effects.
dispersion compensation module (DCM)
Spooled fiber used to control excess dispersion found in certain fiber types at pre- and
post-amplification.
distortion
The difference in value between two measurements of a signal (transmitted and received).
DS3
Standard for digital transmission (American National Standard for telecommunications -
Carrier-to-Customer Installation - DS3 Metallic Interface, ANSI T1.404- 1989).
DWDM
See “dense wavelength division multiplexing” (p. GL-7) for definition.
dynamic gain equalization filter (DGEF)
A filter that equalizes the gain of an optical signal.
dynamic host configuration protocol (DHCP)
DHCP allows a DHCP server to automatically assign an IP address to a computer's TCP/IP stack
software. The number is taken from a defined range of numbers for a given network.
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E earth
The European term for electrical ground.
EC
See “equipment controller” (p. GL-9) for definition.
Glossary
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1830 PSS-36/PSS–32/PSS-16/PSS-4
8DG60888CAAA Release 3.6.0 and 3.6.1
Issue 1 June 2011
GL-7
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