C

	CA Conditional Access
	CAC Connection Admission Control Term used in conjunction with ATM
	CAC Carrier Access Control
	CAC Channel Access Code
	CACG Commonwealth Association of Corporate Governance
	CAD/ CAM Computer Aided Design/Manufacture The use of IT in the process of design and manufacture
	CADU Channel Access Data Unit
	CAGR Compound Annual Growth Rate Used to describe the increase or decrease of a given metric over a period greater than one year.
	CAI Computer Aided Instruction
	CAL Computer Aided Learning A generic term for information and learning materials via technology
	CAL Computer Access Licence
	CAM Controlled Attachment Module
	CAN Cable Area Network
	CAP Carrierless Amplitude and Phase
	CAP Competitive Access Provider
	CAPI Common API
	CARP Controlled Array Routing Protocol
	CARS Community Antenna Relay Station
	CAS Channel Associated Signaling
	CAS Conditional Access System
	CASE Computer Aided Software Engineering
	CAT Conditional Access Table
	CAT Computer Assisted Training
	CATV Community Antenna TeleVision
	CAU Controlled Access Unit
	CBC Cipher Block Chaining
	CBIU Common Business Intelligence Unit
	CBR 1)Case-Based Reasoning 2)Content-Based Retrieval 3)Constant Bit Rate
	CBT Computer Based Training A popular way of training by computer as opposed to class room environment
	CC Call Control
	CCD Charge Coupled Device
	CCF Custom Calling Features
	CCITT Consultative Committee for International Telephony and Telegraphy
	CCP Compression Control Protocol
	CCS Common Channel Signaling
	CCU Common Control Unit
	CD Compact Disc A medium containing digital information. Approximately 640Mb
	CD Carrier Detect Modem term
	CDAS Command and Data Acquisition Station
	CDDI Copper Distributed Data Interface
	CDF Channel Definition Format
	CDMA Code Division Multiple Access This is one of several digital wireless transmission methods
	CDPD Cellular Digital Packet data
	CDR Compact Disc Recordable
	CDRM Cross Domain Resource Manager
	CDROM Compact Disc Read Only Memory Alternative name for CD, but better description. Contains read only material
	CDRW Compact Disc Read Write
	CDT Carrier Definition Table
	CDV Cell Delay Variation
	CDVT Cell Delay Variation Tolerance
	CE Consumer Electronics
	CEI Connection Endpoint Identifier
	CELP Code Exited Linear Prediction
	CEM Customer Experience Management
	CER Cell Error Ratio
	CES Circuit Emulation Service
	CEV Controlled Environmental Vault
	CGA Colour Graphics Array Standard for 16 bit colour graphics
	CGI Common Gateway Interface
	CGM Computer Graphics Metafile Standard for 16 bit colour graphics
	CIC CPU Interrupt Code
	CIC Cable In Conduit
	CIC Carrier Identification Code
	CICS Customer Information Control System
	CIDR Classless Inter Domain Routing
	CIF Common Intermediate Format A picture resolution of 352 x 288 pixels
	CIM Common Interface Model
	CIM Customer Interaction Management Unlike CRM, CIM deals solely with the experience of the customer at the point of interaction
	CIR Committed Information Rate
	CIS Card Information Structure
	CISC Complex Instruction Set Computer Most PCs use CISC, the CPU supports as many as 200 instructions.
	CIU Controls Interface Unit
	CL ConnectionLess
	CLASS Custom Local Area Signalling Service
	CLC Cholesteric Liquid Crystal Used in flat screen technology
	CLEC Competitive Local Exchange Carrier
	CLI Caller Line Identification
	CLI Command Line Interface
	CLI Cumalative Leakage Index
	CLID Calling Line IDentification
	CLNP Connectionless Network Protocol
	CLP Cell Loss Priority
	CLR Cell Loss Ratio
	CLTP Connectionless Transport Protocol
	CM Computer Modem
	CMIP Common Management Interface Protocol
	CMISE Common Management Information Service Element
	CMOS Complementary Metal-Oxide Semiconducter Widely used type of semiconductor. Uses both NMOS (-ve) and PMOS (+ve) circuits. Used in battery powered devices also in PCs to backup time and date etc.
	CMS Cable Management System
	CMTS Cable Modem Transmission System
	CNID Calling Name Identification
	CNR Carrier to Noise Ratio
	CNR Complex Node Representation
	COAMS Customer Owned And Maintained Systems
	COBOL Common Business Oriented Language Second oldest high level programming language, the oldest being FORTRAN. Particularly used for business applications running on large computers. Most widely used programming language in the world.
	CODEC Coder-Decoder Converts analogue audio and video to digital
	COF Ciphering OFfset
	COM Common Object Module
	CORBA Common Object Request Broker Architecture An architecture that enables programs called objects to communicate regardless of what programming language they were written in or what operating system they run on.
	COS Class Of Service
	COSE Common Opened System Environment
	COT Customer Originated Trace
	CP Content Provider
	CPB Constrained Parameter Bitstream
	CPCS Common Part Convergence Sublayer
	CPD Common Path Distortion
	CPE Customer Premises Equipment
	CPI Characters Per Inch
	CPI Common Part Indicator
	CPS Characters Per Second
	CPU Central Processor Unit More commonly know these days as a processor chip. Was used to describe the core processing functions of the arithmetic unit, central I/O, RAM and control.
	CRC Cyclic Redundancy Check A method of checking for data corruption’s
	CRL Certificate Revocation List A database of certificates no longer valid within a given security infrastructure.
	CRM Customer Relationship Management A term used to describe a suite of programmes or databases used to hold customer information with a view of increasing knowledge of a customer and thus improving service.
	CRO Cathode Ray Oscilloscope
	CRS Cell Relay Service
	CRT Cathode Ray Tube Displays output from a computer

Carrier Selection

Computer Services

Customer Service

CSI

Called Subscriber Identification

CSSLIP

Compressed Serial Link Internet Protocol

CSMACD

Carrier Sense Multiple Access with Collision Detect

CSTA

Computer Supported Telecommunications Applications

CSU

Channel Service Unit

CSV

Comma Separated Variable

Format used to export a file to a spreadsheet retaining fields and cells separating data with a comma

Cordless Telephone

CTD

Cell Transfer Delay

Used in ATM

CTI

Computer Telephony Integration

Associated with Call Centres, allows inbound calls to be recognised and allocated. Automation of PC and telehone

CTN

Cable Termination Node

CTS

Clear To Send

Normally associated with Modems

CVSDM

Continuous Variable Slope Delta Modulation

CVV

Card Verification Value

A cryptographic checksum used to protect data on the magnetic stripe of credit cards.

Continuous Wave

CWE

Collaborative Work Environment

CXML

Commerce eXtensible Markup Language