DFS

disciplined frequency standard

DNHR

dynamic nonhierarchical routing

DoD

U.S. Department of Defense

DoT

U.S. Department of Transportation

DSP

digital signal processing

DTD

digital time division

DTMF

dual-tone multifrequency signaling

ECSA

Exchange Carrier Standards Association

EO

Executive Order

FAA

Federal Aviation Administration

FCC

Federal Communications Commission

FDDI

fiber digital distribution interface

5ESS

No. 5 Electronic Switching System

4ESS

No. 4 Electronic Switching System

GOES

Geosynchronous Orbiting Environmental Satellite

GPS

Global Positioning System

HDTV

high-definition television

IDTV

improved definition television

IEC

interexchange carrier

INTELSAT

International Telecommunications Satellite Organization

ISDN

integrated services digital network

LAN

local area network

LATA

local access transport area

LEC

local exchange carrier

LED

light-emitting diode

LMSS

land mobile satellite systems

LORAN-C

Long-Range Navigation System-C

MAN

metropolitan area network

MCI

MCI Communications Corporation

MF

multifrequency signaling

ms

milliseconds

µs

microseconds

MTBF

mean time between failure

MTSO

mobile telephone switching office

MTT

mobile transportable telecommunications

MTTR

maximum time to repair

NASA

National Aeronautics and Space Administration

NBS

National Bureau of Standards

NCC

National Coordination Center

NCS

National Communications System



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