CAC Customer Access Connection

CAFE Common Access For Everybody

CAI Common Air Interface

CAMC Customer Access Maintenance Center

CAN Customer Access Network

CAS Common Asynchronous Set

CBR Constant Bit Rate

CC Call Control

CC Connection Control

CCD Centres de Commutation de Données

CCETT Centre Commun d'Etudes de Télécommunication et de Télédiffusion

CCIR Comité Consultatif International des Radio-Communications

CCITT Comité Consultatif International des Télégraphes et des Téléphones

CCM Centre de Communication des services Mobiles

CCMN Centre de Commutation pour Services Mobiles Nominal

CCMV Centre de Commutation des Mobiles Visité

CCS Common Channel Signalling

CCSN Common Channel Signalling Network

CCTLD Country Code Top Level Domain

CDF Common Data Format

CDLC Cellular Data Link Control

CDMA Code Division Multiple Access

CDPD Cellular Digital Packet Data

CE Connection Element

CEI Comparably Efficient Interconnection

CENTR Council of European National Top Level domain Registries

CEPT Conference of European Postal and Telecommunications administrations / Conférence Européenne des administrations des Postes et Télécommunications

CETS Centre d'Exploitation Télématique par Satellites (FR, Mulhouse)

CGI Common Gateway Interface

CGR Centre de Gestion de Réseau

CHG CHarging Message

CIF Common Intermediate Format

CIL Common Interface Language

CIM Compuserve Information Manager

CIR Carrier to Interference Ratio / Rapport Porteuse/Brouillage

CIT Computer Integrated Telephony

CLSF ConnectionLess Service Function

CM Connection Management

CMF Commission Ministérielle des Fréquences (FR)

CMR Conférence Mondiale des Radiocommunications

CMS Cable Management System

CMTS Cable Modem Termination System

CN Customer Network

CNCL Commission Nationale de la Communication et des Libertés

CNE Concentrateur Numérique Eloigné

CNET Centre National d'Etudes des Télécommunications (FR)

CNID Calling Number Identification

CNL Concentrateur Numérique Local

CNN/CSI Common Communication Network / Common System Interface

COH Connection OverHead

COM Continuation Of Message

COSINE Cooperation for Open Systems in Europe

CPA Codage Prédictif Adaptif

CPE Customer Premises Equipment

CPIC Common Programming Interface Communications

CPN Customer Premises Network

CPP Cordless Portable Part

CPSS Call Processing Sub System

C/R Command / Response

CRC Cyclic Redundancy Check / Contrôle de Redondance Cyclique

CRF Connection Related Functions

CSDN Circuit Switched Data Network

CSI Computer Security Institute

CSMA Carrier Sense Multiple Access

CSMA/CA Carrier Sense Multiple Access with Collision Avoidance

CSMA/CD Carrier Sense Multiple Access with Collision Detection

CSN Circuit Switched Network

CSPDN Circuit Switched Public Data Network

CSR Common Synchronous Reset

CSTA Computer Supported Telephony Application

CT Centre de Traffic

CT Communication Technologies (same as TC)

CT Connection Type

CTE Customer Terminal

CTI Couplage Téléphonie Informatique (système de répartition automatique d'appels)

CTM Circuit Transfer Mode

CTP Commutateur de Transit Principal

CTTI Commission de Traitement de la Transmission de l'Information

CUT Control Unit Terminal

CVC Circuit Virtuel Commuté

CVP Circuit Virtuel Permanent

CVSD Continuously Variable Slope Delta Modulation

CYREC CYclic REquest Control