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C - C Programming Language

C - confidential

C-FAST - counter-force automated surveillance & targeting (USAF)

C-SIGINT - counter-signals intelligence

C-LAN - Communications-LAN

C-E - communications-electronics

C - clear

C-Bit - Parity Format - This arrangement of the control bits in the basic M-frame is to enhance the current asynchronous DS3 datastream functionality. The 21 C-bits are defined to provide improved network maintenance and monitoring, or DS3 path monitoring and implementation of FEBE as well as providing for data link applications. Contrast with M13 format used for DS1 to DS3 multiplexing.

C-E - communications-electronics

C-EMS - Communications-Electronic Management System

C&A - certification & accreditation

C&D - cover and deception

c/kT - ratio of average carrier power to noise power spectral density

C/Ku - commercial satellite communications frequency bands

C/S/A - CINC, Service, or agency

C2 - command and control

C2 - configuration 2

C2 - uplink network control

C2BFMAA - command and control battlefield function mission area analysis

C2CAMP - command and control concept and management plan

C2CM - C2 countermeasures

C2DA - command and control decision aid

C2E - command and control element

C2IPS - command and control conformation processing system

C2MAA - command and control mission area analysis

C2MADP - command and control mission area development plan

C2MAMP - command and control mission area materiel plan

C2MUG - command and control microcomputer users group

C2P - command and control protect

C2T2 - Commercial Communications Technology Test Bed

C2V - command and control vehicle

C2W - command and control warfare

C2WC - Command and Control Warfare Commander (Navy)

C3 - command, control and consultation (NATO)

C3 - command, control, and communications

C3 - downlink network control

C3CM - C3 countermeasures (now C2CM or C2W)

C3EVAL - command, control, and communications evaluation model

C3I - command, control, communications and intelligence

C3I - command, control, communications and information (UK)

C3I - Command, Control, Computers, and Intelligence

C3S - command, control, communications system

C4 - command, control, communications, and computers

C4I - Command, Control, Communications, Computer and Intelligence

C4I2 - command, control, communications, computing, intelligence and information systems

C4IFTW - Command, Control, Communications, Computers, and Intelligence for the Warrior

C4ISR - C4 Intelligence, Surveillance and Reconnaissance

C4ISR - command, control, communications, computers,intelligence, surveillance, and reconnaissance

C6 - Combined Command, Control, Communications, and Computer Systems Directorate

CA - Certification (certificate) Authority

CA - III Challenge Athena Phase III

CAAM - computer assisted artillery meteorology

CAAP - Critical Asset Protection Program

CAB - combat air base

Cabinet - An equipment enclosure, usually with front and rear doors. Standard EIA equipment cabinet that houses card shelves, power supplies, alarm panel, fans, power distribution units, T1 jackfields.

CAC - connection admission control

CAC - Common Access Cards

CAC2 - combined arms command and control (Army)

CACSD - computer-aided control system design

CAD - computer-aided design

CAD - collective address designators

CADCI - common air defense communications interface CAP control and alarm panel

CADD - computer aided design and drafting

CADS - computer anomaly detection system

CAE - common applications environment

CAE - computer-aided engineering

CAF - Combat Air Force

CAFED - computer-aided file of engineering drawings

CAFMS - computer assisted force management system

CAGE - commercial and government entity

CAI - computer-aided instruction

CAIRN - collaborative advanced internet research network

CAIS - common APSE interface set

CAL - computer-assisted learning

CALC - customer access line charges

Call - Manager - Controls busy/unbusy for voice calls.

Call - Priority - The priority assigned to each origination port to establish the order in which calls are reconnected, It also defines which calls can or cannot be placed when bandwidth has been reserved.

Call - Setup - The process of dynamically allocating bandwidth and establishing logical circuits that permit a voice or data call connection.

Call - Summary - Contains a summary of calls in progress on a node, link, or card.

Call - The logical port-to-port connection or circuit (also referred to as a channel) built between two ports by the network, including the origination node, pass-through nodes, and the destination node.

Called - Party Address - This is the destination phone number of a call delivered to a switch. For instance this could be the CLID of a call delivered to a PBX using DID or two-way trunks. See also DID.

CALM - computer aided load manifest (manifesting) system

CALS - computer-aided acquisition and logistics support (old)

CALS - continuous acquisition and life cycle support (new)

CAM - communication access method

CAM - computer-aided manufacturing

CAM - content-addressable memory

CAM - configurable access module

CAMA - centralized automatic message accounting

CAMEO - Computer-Aided Management of Emergency Operations (EPA)

CAMIS - Customs accounting and management information system (Customs)

CAMP - command ADP modernization program

CAMP - common Ada missile package

CAMP - computer-assisted message preparation

CAMPS - computer-aided mission planning system

CAMPS - compartmented All Source Analysis System messageprocessing system

CAN - customer access network

CAN - campus area network

CAOC - Combined Air Operations Center (NATO)

CAOW - cable orderwire

CAP - carrierless amplitude phase (modulation)

CAP - Channel Access Protocol

CAP - competitive access provider

CAP - communications-electronics accommodation program

CAP - Connection Approval Program

CAP - Control and Alarm Panel

Capacity - The amount of communications traffic a circuit, multiplexer, or network system can support. Capacity is determined by the available bandwidth and the ability to maximize bandwidth use.

CAPE - computer-aided parametric estimating

CAPI - cryptographic application programming interfaces

CAPS - communications/aural protective system

CAPS - corporate accounts processing system (IRS)

CAR - committed access rate

Card - A printed circuit board assembly that is located in a card slot on a shelf (also referred to as a module). Typically a module has a front and rear interface card. The front card contains the logic associated with the card. The card is identified by a card ID.

Card - ID - Cards are identified through the Operator Interface by a number from 0 to 127 preceded by the letter "C" and an optional node ID (for example, N2C26). The card number refers to the actual card slot in which a card resides (or will reside) in the card shelf.

Card - Parameters - See parameters.

Card - Shelf - Card shelf is a chassis that contains front and rear cards and a backplane. The cards on the shelf are connected by buses. The Promina 800 HSS-2 shelf has 16 card slots, the STS shelf has 12 card slots, and the EXS shelf has 16 card slots; the Promina 400 has 12 card slots and the expansion unit has 12 card slots; and the Promina 200 has 8 card slots.

Card - Slots - Guide rails, at the top and bottom of the card shelf interior, provide slots for inserting cards into the shelf.

CARDS - central archive for reusable defense software

CARP - contingency alternate route plan

Carrier - Detect Circuitry - Circuits that detect a carrier signal to determine if a transmission is about to occur.

Carrier - Signal - A continuous sine-wave signal at a frequency that easily passes over the communications medium. It is a pipeline that allows data to move from DCE to DCE, with the carrier modulated in order to send data.

CARS - cable television relay service (station)

CARS - contingency airborne reconnaissance system (USAF)

CART - compact array radio-location technique

CART - computer analysis and response team (FBI)

CARTS - common Ada run-time system

CAS - command automation system

CAS - crew assignment sheet

CAS - Task (Channel Associated Signaling) Task - The CAS task implements all signaling protocols and conversions for PRC and TMCP modules. The CAS task provides support for signaling protocol SSDC5-A and E&M, as described in British Telecom Publication BTNR 187.

CASE - computer-aided (assisted) systems (software) engineering

CASES - capability assessment expert system

CASL - CSCE automated software load

CASS - consolidated automated support system

CAST - computer-aided software testing

CAT - computer-assisted training or technology

CATC - carrier air traffic control center

CATF - Commander Amphibious Task Force

CATIA - computer graphic aided three-dimensional application

CATIS - computer-aided tactical information system

CATS - consolidated asset tracking system (Justice)

CAU - controlled access unit

CAU - crypto authorization (ancillary) unit

CAVE - Cellular Authentication of Voice Encryption

CAW - certification authority workstation

CAWG - Communications Architecture Working Group

CB - common battery

CBAC - Context Based Access Protocol

CBC - cipher block chaining

CBCS - Combat Communications Squadron

CBCS - common baseline circuit switch

CBCS - common battery circuit switching

CBEMA - Computer and Business Equipment Manufacturers Association

CBFS - cesium beam frequency standard

CBI - computer based instruction

CBLTU - common battery line termination unit

CBMS - computer-based mail system

CBR - case based reasoning

CBR - continuous (constant) bit rate

CBS - corps battle simulation

CBT - computer based training

CBT - crossbar transceiver

cbt - combat

CBU - Conference Bridge Unit

CBus - (Control Bus) - The CBus carries signaling and control information between modules.

CBX - computer branch exchange

CC - communications central

CC - common criteria

CC - Combatant Commander

CC/S/A - Combatant Commander/Service/Agency

CCA - Circuit Card Assembly

CCB - (Call Control Block) - The basic data structure that is used by the call controller to identify and describe data circuits. A Call In Progress (CIP) block forms an extension to the CCB during circuit construction. This is discarded upon circuit establishment.

CCC - CINC Command Complex

CCC - command and control center

CCC - critical control circuit

CCD - charged-coupled device

CCDEL - Command and Control Demonstration Laboratory

CCDG - Commander, Cruiser Destroyer Group

CCDL - cross channel data link

CCE - configurable crypto engine

CCEP - commercial communications security endorsement program

CCES - contingency communications extension switch

CCF - control communications facility

CCI - computer crime Iinitiative

CCI - Computer Crime Investigator

CCI - controlled cryptographic item

CCI - controlled COMSEC item

CCIR - commanderÕs critical information requirements

CCIR - consultative committee of international radio

CCIS - command center information system

CCIS - command, control and information system

CCIS - 1. Common Channel Interoffice Signaling. A signaling system where network information such as address and routing information are handled externally to the actual communications (voice) path. SS7 (Signaling System 7) is the internationally standardized CCIS system. Deployment of CCIS increased efficiency since no communications (voice) channels are used merely to report an "all trunks busy" or "far end busy" conditions. It also decreased toll fraud substantially since it removed the potential for access to the signaling information that was inherent to in-band signaling schemes. CCIS also enables CLASS features as well as sophisticated re-routing features for "intelligent network" applications. See also In Band Signaling. 2. common channel interswitch signaling

CCITT - (Consultative Committee for International Telegraph and Telephone) - This international organization recommends standards for telecommunications. Also see ITU.

CCIU - CEF control interface unit

CCL - connection control language

CCL - continuous communications link

CCL - communications-computer link

CCN - common control node

CCOR - corps COMSEC office of record

CCOW - control channel order wire

CCP - Caneware control processor

CCP - contingency communications package

CCPC - Civil Communications Planning Committee (NATO)

CCPDS - command center processing and display system

CCPL - command and control product line (USAF)

CCPS - contingency communications parent switch

CCR - call completion rate

CCS - combat control system

CCS - command & control systems

CCS - constellation control stations

CCS - (Common Channel Signaling) - 1. A channel used to carry signaling information via LAPD (link access procedure/D channel). 2. communications control set

CCSA - common control switching arrangement

CCSC - Commercial Computer Security Centre (UK)

CCSD - control communications service designator

CCSIL - command and control simulation interface language

CCSK - cyclic (cycle) code shift keying

CCSQ - combat communications squadron

CCSS - commodity command standard system

CCTC - Command and Control Technical Center

CCTT - Close Combat Tactical Trainer

CCTT - command and control team trainer

CCTV - closed circuit television

CCU - common control unit

CCU - combined controller unit

CCW - cable cutoff wavelength

CD - carrier detect

CD - collision detection

CD - color display

CD - compact disk

CD-I - compact disk-interactive

CD-MO - compact disk-magneto optical

CD-R - compact disk-recordable

CD-RDx - dompact disk - read only memory data exchange standard

CD-ROM - compact disk - read only memory

CD-RTOS - compact disk - real time operating system

CD-V - compact disk - video

CD-WO - compact disk - write once

CD-XA - compact disk - extended architecture

CD-R - compact disk recordable

CD - channel designator

CD - compact disk

CD - compressed dial

CDA - compound document architecture

CDA - computer design activity

CDA - conditioned diphase adapter

CDC - Conditioned Diphase Converter

CDC - central directory component

CDD - common data dictionary

CDDI - copper distributed data interface

CDE - common data environment

CDE - common desktop environment

CDF - combined distribution frame

CDGS - conditioned diphase group signal

CDI - Conditioned Diphase

CDIF - CASE data interchange facility

CDIG - commercial digital

CDIS - counter drug intelligence system

CDL - computer design language

CDL - compressed dialing list

CDM - cable driver modem

CDM - conditioned diphase modulation

CDMA - code division multiple access

CDMGB - Cable Driver Modem Group Buffer

CDMS - computer-aided design data management system

CDN - consolidated data network (Treasury) (Now TCS)

CDN - compressed dial number

CDOS - concurrent disk operating system

CDP - 1. conditioned diphase; 2. Cisco Discovery Protocol

CDPD - cellular digital packet data

CDPSK - coherent differential phase-shift keying

CDR - call detail recording

cdr - commander

CDS - Compact Digital Switch

CDS - call directory service

CDS - combat direction system

CDS - command destruct system

CDS - communications deception unit

CDS - compact disk switches

CDSF - Combat Developer Software Facility

CDSS - commanders decision support system

CDT - computer directed training

CDU - Control Display Unit

CDV - compressed digital video

CE - cache enable

CE - communications element

CE - communications-electronics

CEC - computer engineering center

CEC - cooperative engagement capability (Navy)

CEC - Central Equipment Cabinet

CECOM - Communications and Electronics Command (Army)

CEF - common equipment facility

CEF - COMSEC equipment facility

CEG - communications equipment group

CEG - Common Equipment Group

CEI - communications/electronics intelligence

CEI - comparatively efficient interconnection

CEI - conducted electromagnetic interference

CEIS - corporate executive information systems

CEIT - Center of Excellence for Information Technology

CellXpress - Module - This module is an ATM access device supporting T1, E1, T3, and E3 trunk interfaces. It multiplexes different sources of Promina traffic (voice, video, and data) for transport across an ATM network.

CELP - code-excited linear prediction

CEM - Control Electronics Module

CEMT - Center for Electronic Messaging Technologies (GSA)

cen - center

CENT - US Central Command

CENTAF - Air Force Component Central Command

CENTCOM - US Central Command

Central - Office - See CO.

CEOI - communications-electronics operating instruction

CEP - civil emergency planning

CEP - cable entrance panel

CEPT - (Committee of European Postal and Telecommunications) Module - This module is an internodal trunk operating at 2048 kbps (European data rates). It supports HDB3 line coding, which meets the ones density without data corruption. This module cannot be used for port connection to a channel bank.

CERIAS - Center for Education and Research in Information Assurance and Security

CERT - Computer Emergency Response Team

CES - circuit emulation standard

CESA - Cyberspace Electronic Security Act

CESE - communications equipment support element

CESG - Communications Electronics Security Group (UK)

CESG - communications equipment support group

CESO - Communications-Electronics Staff Officer

CEWI - combat electronic warfare intelligence

CEWS - communications early warning system

CF - central facility

CFAA - Computer Fraud and Abuse Act

CFD - configure fill device

CFE - Caneware front end

CFPD - color flat panel display

CFRP - conceptual rramework for reuse planners

CG - communications group

CGA - color graphics adapter

CGI - common gateway interface

CGI - computer generated interface

CGM - computer graphics metafile

CGRP - common hardware reference platform

CGS - common ground station

CGSC - Command and General Staff College

CGTS - Coast Guard telecommunications system

CGWS - Coast Guard work station

CH - channel

CHAALS - communications high accuracy airborne location system

chan - channel

Channel - An electronic communications path, usually of 4,000 Hz (voice) bandwidth; physical or logical path allowing the transmission of information. Generally, channel refers to an individual DS0B Circuit with a DS0B bundle. Also see port.

Channel - Bank - Equipment used to connect to digital transmission facilities. In the transmit direction, the channel bank performs sampling, time-division multiplexing, compression, and encoding in binary format. In the receive direction, the channel bank performs decoding, expanding, and gating. The channel bank must also detect and transmit signaling information for each channel, transmit framing information to the receiving terminal so that the time slots allocated to each channel can be identified, and transmit alarm signals to the far terminal during a specified alarm condition.

Channel - Capacity - The maximum information transmission rate possible through a channel at a specified BER.

Channel - Time Slot - In time-division multiplexing, a time slot starting at a particular phase in each primary frame and allocated to a channel for transmitting pulse-coded voice or data signal. A standard PCM system has 24 channel time slots.

CHAP - Challenge Handshake Authentication Protocol

CHAR - character

CHBDL - common high bandwidth data link

CHCS - composite health care system

Checksum - The sum of a group of data items, associated with the group, for checking purposes.

CHEMO - chemical officer

CHIMPS - Chirpsounder Integrated MUF Prediction System

CHIPs - correlation of hot IPs

CHISSA - center for high integrity system software assurance

CHK - check

CHNG - change

CHNL - channel

Choke - Exchange - A telephone exchange which is assigned to Radio and TV stations, Promoters, and other users which will be receiving large numbers of simultaneous calls. The idea is to group all of these users on a single exchange so when all routes into that exchange are in use "normal" users (on other exchanges) will not experience blocking of incoming or outgoing calls. Trunks from other local exchanges into the choke exchange are deliberately limited to just a few paths so callers will get an "all trunks busy" instead of completely blocking their local exchange. However, when one of the choke exchange users experiences a large number of calls (as when your station runs a contest) the other choke exchange users will be blocked because all trunks into the choke exchange will be busy. See Blocking and Concentration

CHPC - center for high-performance computing

CHS - common hardware and software

CHUB - controlling HUB

CI - counterintelligence

CI - competitive intelligence

CI-library - cryptographic interface library

CI - (Customer Installation) - Equipment and wiring at the customer's location on the customer side of the Network Interface (NI).

CI/SCM - counterintelligence and security countermeasures

CIAC - Computer Incident Advisory Council (capability)

CIAO - Critical Infrastructure Assurance Office

CIAP - combat intelligence architecture plan

CIB - communications information bulletins

CIC - carrier identification codes

CIC - combat information center

CIC - Committee on Information and Communications

CIC - communication interface controller

CIDF - Common Intrusion Detection Framework

CIDOS - COMSEC Interservice Depot & Overhaul Standard

CIDR - classless interdomain routing

CIDSE - consolidated integrated development support environment

CIDSS - CINCPACAF integrated decision support system

CIFAX - ciphered facsimile

CIFS - common Internet file system

CIG - communications interface group

CIGSS - common imagery ground/surface system

CIHEP - Counterintelligence and Human Intelligence Equipment Program

CIK - crypto ignition key

CILS - Commerce Information Locator Service

CILS - continuous integrated logistics system

CIM - Center for Information Management

CIM - computer integrated manufacturing

CIM - corporate information management

CIM - Crypto Interface Module

CINC - Commander-in-Chief

CINC - commander in chief of a combatant command

CINCPAC - FLT - Commander-in-Chief, Pacific Fleet

CINEMA - commerce, internet, electronic mail access (GSA/FTS)

CIO - Central Imagery Office (now part of NIMA)

CIO - Chief Information Officer

CIOCS - communication input/output control system

CIOSP - Chief Information Officer Solutions and Partners (NIH)

CIP - consolidated imagery program

CIP - communications improvement program

CIP - communications implementation plan

CIP - combat information processor

CIP - Critical Infrastructure Protection

CIP - critical intelligence parameters

CIP - communications interface processor

CIPO - CINC Interoperability Program Office

CIPSO - commercial Internet protocol security option

CIPSU - CIP pseudoline

CIPWG - Critical Infrastructure Protection Working Group

CIR - committed information rate

CIR - Central Intelligence Report

CIRC - central information reference and control system

Circuit - A communications path between two points.

Circuit - Switched Data - See CSD.

Circuit - Switching - A system where a dedicated channel is allocated to the users of that call for the duration of that call. That channel is allocated for the duration of the call regardless if information is being transmitted at any given moment. Bandwidth through the channel is fixed, at no time may this bandwidth be exceeded. If this bandwidth is not used it is wasted. While inherently inefficient, the dependable and reliable nature of circuit switching makes it ideally suited to real-time voice and audio/video conferencing applications. This is in stark contrast to systems where statistical multiplexing is used. See Statistical Multiplexing

CIREN - Crash Injury Research and Engineering Network (NHTSA)

CIRG - Critical Incident Response Group (FBI)

CIRK - common interswitch rekey key

CIRK - common interswitch rekey

CIRT - computer incident response team

CIRV - common interswitch rekeying variable

CIS - combat intelligence system

CIS - communications and information systems (NATO)

CIS - CASE integration services

CIS - Combat Intelligence System

CIS - computer aided system engineering integration services

CISA - C4I Integration Support Activity

CISC - complex instruction set computer

CISL - common intrusion specification language

CISO - Chief Information Security Officer

CISO - counterintelligence staff officer

CISRV - common interswitch rekey variable

CISS - Center for Information Systems Security

CIT - combined interrogator/transponder

CIT - computer integrated telephony

CITA - Center on Information Technology Accommodation (GSA)

CITAC - Computer Investigations and Threat Assessment Center (FBI)

CITEL - Inter-American Telecommunications Commission

CITIS - Contractor Integrated Technical Information Services

CITS - combat information transport system (USAF)

CIU - communications interface unit

CIWE - Center for Information Warfare Excellence

CIX - Commercial Internet Exchange

CJA - Civil/Judge Advocate

CJCS - Chairman of the Joint Chiefs of Staff

CJCSI - Chairman of the Joint Chiefs of Staff Instruction

CJCSM - Chairman of the Joint Chiefs of Staff Manual

CJIS - criminal justice information services (systems) (FBI)

CJLI - command job language interpreter

CJTF - Commander, Joint Task Force

CK - check

CKA - chief knowledge architect

CKL - compromised key list

CKM - COMSEC key manager

CKT - circuit

ckv - common key variable

CLAR - channel local address register

CLASS - Custom Local Area Signaling Services. A variety of enhanced features (usually on analog lines) that take advantage of the ability of modern SS7 technology°Ã~s ability to transmit information about the calling party. CLASS includes such features as Caller ID, Automatic Callback, Call Trace (initiated by subscriber), Selective Call Rejection, etc.

Class - Of Service - Consists of, and determined by, four parameters assigned to each port: (1) call setup priority; (2) compression level; (3) preempt priority, and (4) routing requirement.

CLB - configurable logic block

CLCC - combined loop core card

CLCC - combined loop controller card

CLD - cable length demodulation

Clear - Channel - A 64 kbps channel (DS0) using out-of-band signaling, leaving the entire 64K for data. A clear channel uses no A/B bit signaling information, displayed when querying a port configured for clear-channel operation. Clear-channel operation is used by PRC and TMCP ports which use BEZS line coding. Also see BEZS.

Clear - Channel Bundle - A group of one or more DS0s installed on a TRK-3 span-mode card. Clear channel bundles provide connectivity between the Promina or IDNX node and off-net PX platform ports.

CLEC - Competitive Local Exchange Carrier. Your local telephone service provider who is one of the new-generation providers rather than a RBOC or Independent. A CLEC is really just an Independent, albeit one formed after the divestiture of AT&T. See LEC.

CLEF - commercially licensed evaluation facility

CLF - Commander Landing Force

CLI - call-level interface

CLI - calling line identification

CLID - Calling Line Identification. This is the ISDN and SS7 equivalent of Caller ID; I.E. the number of the calling party. See also ANI.

clk - clock

CLM - cable length demodulation

CLNP - Connectionless Network Protocol

CLNS - connectionless network service

Clock - An oscillator-generated signal that provides a timing reference for a transmission link; it controls timing of functions such as sampling interval, signaling rate, and duration of signal elements. Clocking is accomplished by phase locking to the appropriate reference derived from ports he or trunks.

Clock - Status - Contains information on where the clock information is obtained for the node.

CLR - clear

CLS - crosslink subsystem

CLSA - COMSEC logistics support activity

CLSU - communications security logistics support unit

CLTP - connectionless transport protocol

CLTS - connectionless transport service

CLU - command and launch unit

CLUI - command line user interface

Cluster - Controller - A device that interfaces multiple terminals with data communications facilities associated with central, major computer centers. Commonly used in multipoint synchronous data networks involving distributed transaction processing and host-controlled, centralized network architectures, such as SNA.

CLUT - color lookup tables

CM - configuration management

CM - countermeasures

CM - control modem

CM - communication modem

CM - crypto module

cm - centimeter

CM - control monitor

CMA - control monitor alarm

CMAA - communications mission area analysis

CMC - CDI Modem Card

CMC - computer-mediated communication [Internet]

CMCS - COMSEC material control system

CMD - command

CMDSA - COMSEC Materiel Direct Support Activity

CMI - computer managed instruction

CMI - (Coded Mark Inversion) - A CCITT line coding technique specified for the fourth-level CCITT multiplex signal. CMI is also used in other applications, notably in Japanese DS1 level systems. CMI is similar to digital biphase coding, in that an abundance of signal transitions exist, and there is no DC energy in the signal. Additionally there is no limit on the number of consecutive zeros allowed in the bit stream. CMI encodes ones (marks) as bipolar NRZ level/AMI; zeros are encoded as a half-cycle square wave of one particular phase. See waveform coding.

CMIO - communications security material issuing office

CMIP - common management information protocol

CMIS - common management information system (service)

CMIS/P - common management information services and protocols

CMISE - Corps Military Intelligence Support Element (Army)

CML - computer managed learning

CMM - capability maturity model

CMM - core memory module

CMMS - computerized maintenance management software

CMOS - cargo movement operations system (USAF)

CMOS - complementary metal oxide silicon

CMP - communications message processor

CMPR - common-mode rejection ratio

CMRS - commercial mobile radio services

CMS - Combat Mission Simulator

CMS - command management system

CMS - common mapping system (USAF)

CMS - combat mission simulator

CMS - configuration management system

CMSCD - Communication Mode Selector Control Device

CMST - collection management support tools

CMT - CarryMast Telescopic Mast

CMTC-IS - combat maneuver training center instrumentation system (Army)

CMTS - cable modem termination system

CMU - central management unit

CMW - compartmented mode workstation

CMWS - common missile warning system

CMX - circuit multiplexer

CMY - cyan-magenta-yellow (color model)

CN/CMS - counter-narcotics/command and management system

CNA - computer network attack (DOD)

CNC - computerized numerical control

CNCE - Communications Nodal Control Element

CNCS - crypto net control station

CND - Computer Network Defense

CND - computer network defense

CND-SP - computer network defense service provider

CNE - Computer Network Exploitation

CNI - Center for Networked Information

CNI - communication, navigation, identification

CNIDR - clearinghouse for network information and discovery and retrieval

CNIU - communications/navigation interface unit

CNM - customer network management

CNO - Chief of Naval Operations

CNO - computer network operations

CNOS - corporate network operating system

CNR - carrier-to-noise ratio

CNR - combat net radio

CNRI - combat net radio interface

CNS - channel networking service

CNS - communications, navigation and surveillance (FAA)

CNS - complementary network service

CNS - converged network services

CNSS - Core Nodal Switching Subsystem [Internet]

CNTG - Computer Network Transaction Groups

CNTL - control

CNV - VINSON cryptonet variable

CNX - certified network expert

CO - central office

CO - Commanding Officer

co - company

COA - central operating authority (NATO)

COA - course of action

COAM - customer owned and maintained equipment

COAST - computer operations, audit and security technology

COAX - coaxial cable

COBOL - common business oriented language

COBRA - common object request broker architecture

COCOM - Combatant Commander, combatant command

COCOMO - constructive cost model

CODEC - compression/decompression

Codec - COder/DECoder. A device which takes digitized audio and "codes" it in order to reduce the transmission bit rate and which can also simultaneously "decode" such coded audio. Strictly speaking, a codec does not include an ISDN terminal adaptor and relatedequipment.

COE - Common Operating Environment

COEA - cost and operational effectiveness analysis

COFDM - coded orthogonal frequency division multiplexing

COFF - common object file format

CofS - Chief of Staff

COI - community of interest

COIL - Chemical Oxygen-Iodine Laser

COINS - community online intelligence system

COM - character oriented messages

COMALF - commander, airlift forces comm communications

COMB - combiner

Combination - Trunk - A trunk (channel) which can both make and receive calls. This generally refers to analog ground start or loop start trunks, although the term can be applied to ISDN BRI or PRI channels as well. Each combination trunk normally has a telephone number, although they are frequently part of a hunt group and only one number may be published for that group. Also called a Both Way Trunk. This is not the same as a Two-way DID trunk. See DID Trunk, Hunt Group and Trunk

COMCAM - combat camera

COMINT - communications intelligence

COMM - communications

Common - Carrier - A company that furnishes communications services to the general public and is regulated by appropriate state or federal agencies.

Common - Channel Interoffice Signaling - See CCIS

Common - Equipment - Standard equipment that is shipped with nodes to provide basic functionality. It includes modules (such as the SX, BX, PPM and PSM for the Promina 800) as well as card shelves, power supply trays, and power supplies.

Companding - Derived from COMpressor and exPANDer, companding is the process of logarithmically compressing the dynamic range of an input signal at the transmitter and expanding it back to almost original form at the receiver.

COMPES - contingency operations/mobility planning and execution system

Competitive - Local Exchange Carrier - See CLEC

COMPFEC - compressed with forward error correction

Composite - Loopback - Loopback of the DS0B bundle.

Compression - Application of any of several techniques that reduce the number of bits needed to represent information in data transmission or storage. It conserves bandwidth and memory so the original form of the information can be reconstructed. Compression is also known as compaction.

Compression - Level - A level assigned to each voice port that defines the amount of compression needed on all calls originating from that channel. If a call cannot be set up to satisfy the assigned compression level or that satisfies the default standard of 64 kbps Pulse Code Modulation (PCM), no call is placed.

COMPUSEC - computer security

COMSAT - communications satellite

COMSEC - Communications Security

COMSIM - communications simulation system

COMSPOT - communications spot report

COMSTAT - communications status report

COMSTATSUM - communications status summary report

CONAUTH - controlling authority

Concatenation - The linking of transmission channels end to end.

Concentration - The basic premise is to share facilities wherever possible. For instance, while there may be thousands of customers served by a given Central Office, there will be substantially less than that number of calls which can be handled simultaneously. And even fewer long distance calls can be made simultaneously. The art of Traffic Engineering is to have enough capability that calls are rarely blocked, but not any more than that. See also Choke Exchange and Blocking.

Conditioning, - Line - The addition of equipment to a leased voice-grade channel to improve analog characteristics to allow higher rates of data transmission.

CONEXPLAN - contingency and exercise plan

Configuration - Database - The user-specified information about the network (such as nodes, cards, ports, and links) stored in flash memory, PSM disk drive, or both on Promina nodes.

Connect - Time - The time that a circuit is in use.

Connectivity - The ability to effectively integrate information and communications equipment, including equipment with different standards and protocols.

CONOPS - Concept of Operations

CONPLAN - 1. contingency plan; 2. operations plan in concept format

CONT - continuous

Contention - The facility provided by the dial network or a port selector that allows multiple terminals to compete on a first-come-first-serve basis for a smaller number of computer ports.

Control - Mode - A DDS circuit is in the Control Mode when the circuit's C bit = 0 (for example, the data bits contain a DDS Network Control Code such as a loopback request).

Controller - A generic term for a type of communication control unit that manages the details of line control and routing of data through a network.

CONUS - Continental United States

coord - coordinate(s)

COP - character oriented protocol

COP - common operating picture

COR - central office of record

CORBA - common object request broker architecture

CORN - computer resource nucleus (FAA)

COS - class of service

COS - corporation for open systems

COSCOM - corps support command

COSE - common open system environment

COSMIC - Computer Software Management and Information Center

COSPO - Community Open Source Program Office (CIA)

Cost - Routing - See routing cost.

COSTARS - combined sensors target acquisition, recognition, strike

COT - Commercial Over TRI-TAC

COT - computer operator terminal

COT - customer office terminal

COTS - commercial off-the-shelf

COU - cable orderwire unit

COW - control orderwire

CP - command post

CP - crypto peripheral

CP - collaborative planning

CPAS - Cellular Priority Access Service

CPCI - computer program configuration item

CPCS - (Common Part Conjunction Sublayer) - The Common Part Conjunction Sublayer of ATM Adaption Layer 5 in conjunction with the ATM-layer ATM_user_to_user Indication (end of PDU) provides segmentation and reassembly (frame delimiting) for FR-SSCS PDUs.

CPD - combat pictorial detachment (Army)

CPDLC - controller/pilot data link communications (FAA)

CPDS - computer program development specification

CPE - central processing element

CPE - (Customer Premises Equipment) - Equipment that is located on the customer's premises.

CPFSK - continuous-phase frequency shift keying

CPG - Central Processor Group

CPIN - computer program identification number

CPLD - complex programmable logic device

CPLI - calling party line identification

CPM - communications planning module

CPNI - Customer Proprietary Network Information

CPP - Communications Protocol Processor

CPP - point-to-point analysis

CPP - communication patch panel

CPPP - Compressed Point-to-Point Protocol

CPS - characters per second

CPS - certificate practices statement

CPS - COMSEC parent switch

CPSM - continuous phase shift modulation

CPSR - Computer Professionals for Social Responsibility

CPSS - Computer Systems Squadron

CPTS - computer program test specification

CPU - central processing unit

CPX - command post exercise

CR - channel (circuit) reliability

CRAG - compass, radar and global positioning

CRC - Control and Reporting Center

CRC - circuit routing chart

CRC - (Cyclical Redundancy Check) - 1. An error detection method, for link-level data transmissions, that does mathematical calculations on a message and sends the results to the receiving side. The receiving side performs the same calculation, and if the results do not match, it requests a retransmission. 2. circuit routing chart.

CRE - control and reporting element

CREN - Computer Research Education Network

CRF - Cable Retransmission Facility

CRF - channel reassignment function

CRI - collective RI

CRIS - communications resource information sharing (NCS)

CRIS - computer resources integrated support

CRISD - Computer Resources Integrated Support Document

CRISIS - combat readiness infrastructure support information system (USAF)

CRISP - Computer Resources Integrated Support Plan

CRISP - crypto reduced instruction set processor

CRITIC - critical intelligence

CRL - certificate revocation list

CRM - Collections Requirements Management

CRMP - Computer Resources Management Plan

CROM - control read only memory

Crosstalk - Undesired voice-band energy transfer from one circuit to another (usually adjacent).

CRPA - Controlled Reception Pattern Antenna

CRS - call reporting system

CRS - circuit switch routing

CRT - cathode ray tube

CRXC - continuous receive clock

CRYPTO - cryptographic

Crypto - Synchronizer Circuit - This circuit is used to synchronize external equipment. The circuit is pulsed whenever the DS3 signal is out-of-frame.

CS - communications security

CS - Communications Server

CS-ACELP - Conjugate-Structure Algebraic-Code-Excited Linear-Predictive

CS - circuit switch

CS - combat support

CSA - Combat Support Agencies

CSA - Computer Security Act

CSAP - Computer Security Accreditation Plan

CSAR - Channel System Address Register

CSC - common signaling channel

CSC - computer software component

CSCE - Communications System Control Element

CSCI - Commercial Satellite Communications Initiative

CSCI - computer software configuration item

CSD - cellular security device

CSD - Circuit Switched Data- A dial-up data communications channel which, once established, looks like a transparent data pipe. Also, the type of ISDN service required to utilize this capability of an ISDN circuit. In contrast to CSV.

CSDC - circuit-switched digital capability

CSDS - Packet Switched Data Service

CSE - Center for Security Evaluations

CSE - client server environment

CSE - Communications Security Establishment (Canada)

CSEL - combat survivor-evader locator (communications)

CSEL - circuit switch select line

CSET - computer security engineering team (USAF)

CSF - configuration strapping function

CSG - Cryptologic Support Group (NSA)

CSI - commercial SATCOM interconnectivity

CSI - Computer Security Institute

CSIPG - circuit switch trunk interface planning guide

CSIT - Customer Service Improvement Team

CSL - computer sensitive language

CSL - computer systems laboratory

CSLIP - (Compressed Serial Line Interface Protocol) - A version of SLIP using compression. See SLIP.

CSM - compartmented security mode

CSM - Command Sergeant Major

CSMA/CD - carrier sense multiple access/collision detection

CSNI - communications systems network interoperability

CSO - cognizant security office

CSO - communications service order

CSOLOP - Circuit Switch On Line Operational Program

CSOR - computer security objects register

CSP - common synthetic aperture radar processor

CSP - communications system processor

CSP - Common Security Protocol

CSP - call service position

CSP - Communications Support Package

CSPC - Call Service Position Console

CSPDN - circuit switched public data network

CSPE - Communication System Planning Element

CSR - commercial security requirements

CSR - circuit switch routing

CSR - communications status report

CSR - TEP circuit switch routing task execution plan

CSS - card and socket services

CSS - cascading style sheets

CSS - Central Security Service

CSS - commercial satellite survivability

CSS - common support system

CSS - communications support system (Navy)

CSS - COMSEC subordinate switch

CSS - communications subsystem

CSS - Circuit Switch Subsystem

CSS - combat service support

CSSC - Canadian System Security Centre

CSSCS - combat service support control system (Army)

CSSE - combat service support element

CSSI - computer security subsystem interpretation

CSSPAB - Computer System Security and Privacy Advisory Board

CSSTSS - combat service support training simulation system

CSTC - Computer Security Technology Center

CSTO - Computer Systems Technology Office

CSU - communications switching unit

CSU - computer software unit

CSU - customer service unit

CSU - call service unit

CSU - (Channel Service Unit) - A device at the customer's site that connects to a public carrier's T1 line at the Central Office. It provides bipolar violation correction, assurance of proper ones' density in the transmitted bit stream, and FCC tariff 68 network protection compliance.

CSU/DSU - A device which incorporates the functions of a CSU (Channel Service Unit) and a DSU (Data Service Unit) and interfaces between a Switched-56 (or "Dedicated Digital Service") line and a user's data equipment.

CSV - Circuit Switched Voice- A dial-up communications circuit for voice grade communication. Also, the type of ISDN service required to use this capability of an ISDN circuit. In contrast to CSD.

CSWG - communications systems working group (NATO)

CT - cryptologic technician

CT - cipher text

CT - communications terminal

CT - control telemetry

CTA - common table of allowances

CTAPS - Contingency Tactical Air Control System (TACS) Automated Planning System

CTASC-I - Corps/Theater Automatic Data Processing Service Center Phase-I

CTCD - cipher text data terminal ready

CTCPEC - Canadian trusted computer product evaluation criteria

CTCS - cipher text clear to send

CTDM - cipher text data mode

CTHA - Contra-wound Toroidal Helical Antenna

CTI - computer-telephone integration

CTI - Cryptologic Technician Interpretive

CTI - Control Terminal Interface

CTI - Criterion Test Instructions

CTIA - Cellular Telecommunications Industry Association

CTIC - COMSEC TRANSEC integrated circuit

CTID - communications transmission identifier

CTIS - combat terrain information system

CTIS - command tactical information system (Pacific Command)

CTL - Control

CTLL - cipher text local loopback

CTN - CALS test network

CTOC - Corps Tactical Operations Center

CTOS - convergent technologies operating systems

CTP - Communications Terminal Processor

CTP - common tactical picture

CTPA - coax-to-twisted-pair adapter

CTRL - control

CTRR - cipher text receiver ready

CTRS - cipher text request to send

CTS - clear to send

CTT - CommanderÕs Tactical Terminal

CTT-H/R - commanders tactical terminal-hybrid/receive

CTTA - Certified TEMPEST Technical Authority

CTTA - Certified TEMPEST Technical Authority

CTTH - CommanderÕs Tactical Terminal-Hybrid

CTTM - cipher text test mode

CTTR - cipher text transmit ready

CTTT - cipher text terminal timing

CTU - cabin telecommunications unit

CTX - cipher text transmit

CU - Common User

CU - control unit

CU - common unit

CUBE - command and control unified battlespace environment

CUI - character-oriented user interface

CUITN - Common User Installation Transport Network

CUL - common user language

CUM - cumulative

CUP - COMSEC utility program

Custom - ISDN - An ISDN protocol which pre-dates National ISDN-1. In most cases National ISDN-1 is also available. The Northern Telcom DMS-100 switch supports "Custom DMS ISDN". The AT&T/Lucent 5ESS switch supports "Custom Point-to-Point" (PTP) and Custom Point-to-MultiPoint (PMP). The ISDN protocol has no relation to where one may call.

CV - continuously variable

CV - community variable

CVAT - Coalition Vulnerability Analysis Team

CVBG - carrier battle group

CVDOW - combined voice and data orderwire

CVE - common vulnerabilities and exposures

CVGA - color video graphics array

CVS - cargo visibility system

CVSD - continuous variable slope delta

CVSDA - CVSD altered

CVSDM - (Continuously Variable Slope Delta Modulation) - A speech-encoding technique that encodes the difference between two successive signal levels using a 1-bit sample. The sampling rate that is usually used is 32,000 times per second, but lesser rates have been used successfully.

CVTS - compressed video transmission service

CVW - collaborative virtual workspace

CW - continuous wave

CWAN - coalition wide area network

CWAN - consolidated wide area network (Korea)

CWC - Composite Warfare Commander

CWIN - cockpit weather information system

CWSI - Cisco Works Switch Internetworks

CX - composite signaling

CXR - carrier D4 Superframe

CYMK - cyan-yellow-magenta-black (color model)

CYPRIS - cryptographic reduced instruction set processor

CYW - Cybernetic Warfare

CZ - canal zone


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