Glossary

AC

alternating current

ADPCM

adaptive delta pulse code modulation

ANSI

American National Standards Institute

AT&T

American Telephone and Telegraph Company

BCD

binary-coded decimal

BER

bit error rate

BITS

building integrated timing supply

BOC

Bell Operating Company

BSRF

Basic Synchronization Reference Frequency

CATV

cable television

CCITT

International Consultative Committee on Telegraphy and Telephony

CCS

common channel signaling

CCZ

Coastal Confluence Zone

CDE

clock distribution equipment

CENTREX

central exchange

CI

carrier interconnection

CMTS

Cellular Mobile Telephone Services

CNS

Commercial Network Survivability

CONUS

coterminous United States

CPE

customer-premises equipment

CSI

Commercial Satellite Interconnectivity

DACS

digital automatic cross-connect system

DDS

Digital Data System



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OCR for page 117
Growing Vulnerability of the Public Switched Networks: Implications for the National Security Emergency Preparedness Glossary AC alternating current ADPCM adaptive delta pulse code modulation ANSI American National Standards Institute AT&T American Telephone and Telegraph Company BCD binary-coded decimal BER bit error rate BITS building integrated timing supply BOC Bell Operating Company BSRF Basic Synchronization Reference Frequency CATV cable television CCITT International Consultative Committee on Telegraphy and Telephony CCS common channel signaling CCZ Coastal Confluence Zone CDE clock distribution equipment CENTREX central exchange CI carrier interconnection CMTS Cellular Mobile Telephone Services CNS Commercial Network Survivability CONUS coterminous United States CPE customer-premises equipment CSI Commercial Satellite Interconnectivity DACS digital automatic cross-connect system DDS Digital Data System

OCR for page 117
Growing Vulnerability of the Public Switched Networks: Implications for the National Security Emergency Preparedness 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

OCR for page 117
Growing Vulnerability of the Public Switched Networks: Implications for the National Security Emergency Preparedness NETS Nationwide Emergency Telecommunications Service NIST National Institute of Standards and Technology NLP/NSEP National-Level Program/National Security Emergency Preparedness NRC National Research Council ns nanoseconds NSDD National Security Decision Directive NSEP national security emergency preparedness NSTAC National Security Telecommunications Advisory Committee NTSC National Television Standards Committee ONA Open Network Architecture OSI open system interconnection PBX private branch exchange PPS Precise Positioning Service PRS primary reference standard ps picoseconds PSN public switched networks PUC public utility commission RBOC Regional Bell Operating Company RMS root mean square SF single-frequency signaling SLC-96 Subscriber Loop Carrier-96 SNA System Network Architecture SONET Synchronous Optical Network SSB single sideband STP signal transfer point TAI International Atomic Time (Temps Atomique International) TCP/IP Transmission Control Protocol/Internet Protocol TDMA time division multiple access TSP Telecommunications Service Priority ULSI ultra large scale integration UT Universal Time UTC Coordinated Universal Time (Universal Time, Coordinated) VAN value-added network VLSI very large scale integration VSAT very small aperture terminal WAN wide area network

OCR for page 117
Growing Vulnerability of the Public Switched Networks: Implications for the National Security Emergency Preparedness This page in the original is blank.