Acrynoms starting with 'C' commonly used in data communications

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0-9 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

(suggestions for additions of acronyms or terms)

CACall Appearance
CABSCarrier Access Billing Systems
cachingA form of replication in which information learned during a previous transaction is used to process later transactions.
CAD Computer Assisted Design is a form of drafting on computers.
CAMACentralized Automatic Message Accounting
CAP Competitive Access Provider
CAPCompetitive Access Provider. A company that builds and operates communication networks in metropolitan areas and provides its customers with an alternative to the local telephone company. See CLEC.
CapExCapital Expenditures
CarrierA continuous signal at a fixed frequency that is capable of being modulated with a second (information carrying) signal.
CAT5Category 5 network cabling consists of four twisted pairs of copper wire. The connectors are RJ45. CAT-5 cabling supports speeds up to 100 Mbps.
CAT5eCatagory 5e network cabling, enhanced CAT5, supports networking at Gigabit Ethernet speed over short distances by utilizing all four wire pairs, and it is backward-compatible with ordinary CAT5.
CAT6Catagory 6 network cabling, consists of four pairs of copper wire and utilizes all four pairs. CAT6 supports Gigabit Ethernet. Cat-6 features more stringent specifications for crosstalk and noise. Like CAT5, it is terminated by RJ45 connectors. It is backwards compatible with CAT5 and CAT5E.
catenetA network in which hosts are connected to networks with varying characteristics, and the networks are interconnected by gateways (routers). The Internet is an example of a catenet. See IONL.
CASChannel Associated Signaling is used in T1 circuits. Instead of having a specific timeslot dedicated to provide signal (as is true with ISDN) , signaling bits for on-hook and off-hook are within the sixth, twelfth, eighteenth and twenty-fourth frames of each time slot. CAS is sometimes called RBS (robbed bit signaling) because it takes bits from the bearer channels for signaling.
CBEMA Computer and Business Equipment Manufacturers Association
CBRConstant Bit Rate. A data transmission that can be represented by a non-varying, or continuous, stream of bits or cell payloads. Applications such as voice circuits generate CBR traffic patterns. CBR is an ATM service type in which the ATM network guarantees to meet the transmitter's bandwidth and Quality of Service requirements. See ABR, UBR, VBR.
CCContinuity check
CCDCharge-Coupled Device
CCISCommon Channel Inter-Office Signaling
CCITTConsultive Committee for International Telegraphy and Telephony
CCRCCR Commitment, Concurrency, and Recovery. An OSI application service element used to create atomic operations across distributed systems. Used primarily to implement two-phase commit for transactions and nonstop operations.
CCSCommunications Channel Signaling
CCSACommon Control Switching
CDCarrier Detect
CDFChannel Definition Format. A technology for "push" applications on the World-Wide Web. CDF is an application of XML. See XML.
CDPConditional Di-Phase. A digital encoding technique which is not sensitive to polarity of wires (wires in a pair can be crossed).
CEPTCommittee of Euorpean Postal and Telecommunications
CERNEuropean Laboratory for Particle Physics. Birthplace of the World-Wide Web.
CERTComputer Emergency Response Team. The CERT is chartered to work with the Internet community to facilitate its response to computer security events involving Internet hosts, to take proactive steps to raise the community's awareness of computer security issues, and to conduct research targeted at improving the security of existing systems. The US CERT is based at Carnegie Mellon University in Pittsburgh.
Cell RelaySee ATM.
CFACircuit Facility Assignment
CFMConnectivity Fault Management
CFVCall For Votes. Prior to generating a new newsgroup, a Call For Votes is issued to help determine the need for the group.
CGICommon Gateway interface. A CGI Script is an application that takes input from the client, processes it on the server, and returns the results, displayed in the Web browser.
Channel BankEquipment that connects multiple voice channels to high speed links by performing voice digitization and Time Division Multiplexing.
Charlie-Foxtrot(colloquial usage) seriously beyond all hope. Very badly broken.
checksumA computed value which is dependent upon the contents of a packet. This value is sent along with the packet when it is transmitted. The receiving system computes a new checksum based upon the received data and compares this value with the one sent with the packet. If the two values are the same, the receiver has a high degree of confidence that the data was received correctly.
CICCarrier Identification Code
CIDRClassless Inter-Domain Routing. A method for using the existing 32-bit Internet Address Space more efficiently. See supernet.
CIRCommitted Information Rate
circuit switchingA communications paradigm in which a dedicated communication path is established between two hosts, and on which all packets travel. The telephone system is an example of a circuit switched network.
CIXCommercial Internet Exchange. A connection point between the commercial Internet service providers. Pronounced "kicks." See FIX and GIX
Class-V( Class 5 ) Class 5 CO office is the central point at which subscriber local loops and network trunks terminate and interconnect.
CLECustomer Located Equipment
CLECCompetitive Local Exchange Carrier. A company that builds and operates communication networks in metropolitan areas and provides its customers with an alternative to the local telephone company.
CLICommand Line Interface
client-server model A common way to describe network services and the model user processes (programs) of those services. Examples include the nameserver/nameresolver paradigm of the DNS and fileserver/file-client relationships such as NFS and diskless hosts.
CLNConnectionless Network Protocol. The OSI protocol for providing the OSI Connectionless Network Service (datagram service). CLNP is the OSI equivalent to Internet IP, and is sometimes called ISO IP.
ClockA term for the source of timing signals used in a synchronous transmission.
CLTPConnectionless Transport Protocol. Provides for end-to-end Transport data addressing (via Transport selector) and error control (via checksum), but cannot guarantee delivery or provide flow control. The 051 equivalent of UDP.
CMIPCMIP Common Management Information Protocol
CMISCommon Management Information Services
CNAMErecords are domain name aliases. The most common use is to have a web-server point one url to another. For example "" to "". It could also be used to point "" to "".
COCentral Office
Coaxial (Coax)A cable with a single inner conductor with foam insulation and braided shield. picture
concatenateTo join by attaching one group to another end to end. This is frequently associated with computer data file handling. If file "A" consists of "1234" and file "B" consists of "5678" and you concatenate "B" to "A", the result is "12345678".
compressionThere are several types of compression but the idea is same. Basically compression is used to reduce the amount of bandwidth required to transmit information. Frequently, this accomplished in part by having a character(s) that represents a number of blank spaces without the need for transmitting the blanks themselves. In voice compression, various manufacturers use different techniques. (example of voice compression product)
CompTIAComputer Technology Industry Association - Largest provider of vendor-neutral IT certifications
connectionlessThe model of interconnection in which communication takes place without first establishing a connection. Sometimes (imprecisely) called datagram. Examples: Internet IP and OSI CLNP, UDP, ordinary postcards.
connection orientedThe model of interconnection in which communication proceeds through three well-defined phases: connection establishment, data transfer, connection release. Examples: X.25, Internet TCP and OSI TP4, ordinary telephone calls.
CONSConnection Oriented Network Service.
CookieA small file stored on your computer by a Web browser that tracks your surfing activity. Regarded by some as an invasion of privacy.
congestionoccurs when the offered load exceeds the capacity of a data communication path.
CORBA Common Object Request Broker Architecture. CORBA is the Object Management Group's (0MG) answer to the need for interoperability among the rapidly proliferating number of hardware and software products available today. Simply stated, CORBA allows applications to communicate with one another no matter where they are located or who has designed them. CORBA was introduced in 1991 by OMG which defined the Interface Definition Language (IDL) and the Application Programming Interfaces (API) that enable client/server object interaction within a specific implementation of an Object Request Broker (ORB). See IIOP.
CORECouncil of Registrars. The operational organization composed of authorized Registrars for managing allocations under gTLDs.
core gatewayHistorically, one of a set of gateways (routers) operated by the Internet Network Operations Center at BBN. The core gateway system formed a central part of Internet routing in that all groups would advertise paths to their networks from a core gateway, using the Exterior Gateway Protocol (EGP). See EGP, backbone.
CoClass of Service
COSINECooperation for Open Systems Interconnection Networking in Europe. A program sponsored by the European Commission, aimed at using OSI to tie together European research networks
COTCentral Office Terminal
COTSCommercial Off The Shelf
COTSSCommercial Off The Shelf Servers
C.O.W.Cell On Wheels. The COW is a mobile cell site that includes a tower and transceiver as well as all other necessary equipment, commonly constructed on a trailer or in some cases a truck.
CPECustomer Premise Equipment
CPNCalling Party Number
CRCCyclic Redundancy Check. A number derived from a set of data that will be transmitted. By comparing it to the value originally transmitted, the receiving node can detect some types of transmission errors. See checksum.
CRDICorporation for Research and Educational Networking.
CRMis a broad term meaning customer relationship management. CRM can be software, computer data bases or procedures. Generally, it means collecting detailed information about the customer to provide them with more personalized service.
CSMA/CDCarrier Sense Multiple Access with Collision Detection. The access method used by local area networking technologies such as Ethernet.
CSNETComputer+Science Network. Was a large computer network, mostly in the U.S. but with international connections. CSNET sites included universities, research labs, and some commercial companies. Later merged with BITNET to form CREN. See BITNET.
CSUChannel Service Unit is a digital DCE used to terminate digital circuits (such as DDS or T1 lines) at the customer site. It conditions the line, ensures network compliance with FCC rules, and responds to loopback commands from the central office; it also ensures proper ones density in transmitted bit streams and corrects bipolar violations.
CSU/DSUA device which includes the CSU and the DSU in the same unit.
CTIComputer Telephony Integration. The name given to the merger of traditional telecommunications (PBX) equipment with computers and computer applications. The use of Caller ID to automatically retrieve customer information from a database is an example of a CTI application.
CWDMCoarse Wavelength Division Multiplexing allows for multiple wavelength signals to be sent over a fiber optic connection. This allows for more traffic over the fiber but generally the distance is shorter.
CyberspaceA term coined by William Gibson in his fantasy novel Neuromancer to describe the "world" of computers, and the society that gathers around them. Often used to refer to the Internet, the World-Wide Web or some combination thereof.