\\ More than 3500 Telecom abbreviations maintained by Ioan (Nini) Indreias // 1 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 All words C-ISUP Proprietary Cisco protocol based on ISUP C/(N+I) Carrier to Noise plus Interference Ratio C/I Carrier to Interference Ratio C/N Carrier to Noise ratio C/R Command/Response C/R Control/Response Indication Bit C Curb CA Call Appearance (Telecom) CA Certificate/Certification/Certifying Authority CA Collision Avoidance CA Communications Assistant CA Conditional Access (SAT) CABS Carrier Access Billing System CAC Carrier Access Code CAC Connection Admission Control CACD Commission Advisory and Compliance Division CAD Computer Automated/Aided Design CAD Computer Automated/Aided Dispatch CAD Computer Automated/Aided Drafting CADS Computer Automated/Aided Dispatch System CAE Computer Automated/Aided Engineering CAGR Compound Annual Growth Rate CAI Common Air Interface CAL Customer Access Line CAM Cisco Access Manager CAM Computer Automated/Aided Manufacturing CAM Content-Addressable Memory CAMA Centralized Automatic Message Accounting CAMEL Customised Applications for Mobile network Enhanced Logic (3GPP 23.078) CAN Cosmopolitan Area Network CAP CAMEL Application Part CAP Carrierless Amplitude/Phase modulation CAP Competitive Access Provider CAR Cisco Access Registrar CAR Committed access rate CAR Current Activity Report CAS Centralized Attendant Service CAS Channel Associated Signaling CASE Common Application Service Element CASE Computer Aided Software Engineering CAT Carrier Access Tariff CAT Computer Aided Tomography CATIA Computer Assisted Three-dimensional Interactive Application CATV CAble TeleVision CATV Community Antenna TeleVision CAU Cable Access Unit CB Cell Brodcast (GSM) CB Channel Bank CB Citizens Band CBAC Context-Based Access Control CBC Cell Broadcast Center (GSM) CBC Cipher Block Chaining CBCH Cell Brodcast Channel (GSM) CBCU Centralized Broadband Control Unit CBDS Connectionless Broadband Data Service(s) CBEMA Computer and Business Equipment Manufacturers Association CBQ Class-Based Queuing CBR Constant Bit Rate CBR Constant Bit Rate (ATM) CBS Cell Broadcast Services (GSM) CBWFQ Class-Based Weighted Fair Queueing CBX Computerized Branch eXchange CC Call Context CC Call Control CC Cluster Controller (IBM) CC Connect Confirmation CC Country Code (ITU-T) CC Customer Care CCA Call Control Adjunct CCAPI Call Control API CCB Call Control Block CCB Customer Care and Billing CCBS Call Completion on Busy Subscriber CCC Clear Channel Capability CCC Customer Care Center CCCH Common Control Channel (GSM) CCD Charge Coupled Device CCE Consistency Check End CCF Call Control Function CCF Common Citizen Focus CCG Central Clock Generator CCI Common Client Interface CCIE Cisco Certified Internetwork Expert CCIR international radio consultative committee CCIR International Radio Consultative Committee (ITU) CCIS Common Channel Inter-office Signaling (AT&T) CCITT Consultive Committee on International Telephony and Telegraphy (ITU) CCL Common Carrier Line CCLC Carrier Common Line Charge CCNA Cisco Certified Network Associate CCNC Common Channel Signaling Network Control CCO Cisco Connection Online CCOT Cross Office Transfer Time CCR Commitment, Concurrency and Recovery (Application Layer) CCR Consistency Check request CCR Customer Control Reconfiguration CCR Customer Controlled Reconfiguration CCRU Customer Care Retention Unit CCS7 Common Channel SS7 CCS Centi Call Seconds (Hundred seconds calls per hour) CCS Common Channel Signaling CCS Customer Calling Services CCSA Common Control Switching Arrangement CCSN Customer Contact Services Node CCSRC Cisco Subscriber Registration Center CCSS7 Common Channel SS7 (AT&T) CCTV Closed-Circuit TeleVision CCU Common Control Unit CCXML Call Control XML CD-ROM Compact Disc-Read Only Memory CD Call Disconnect (SS7) CD Carrier Detect CD Circuit Details CD Collision Detection (LAN) CD Compact Disc CDAR Customer Dialed Account Recording CDB Call Detail Block CDC Control Data Corporation CDDI Copper Distributed Data Interface CDE Call Detail Element CDF Channel Definition Format CDMA-1X-EV-DO A variant of CDMA 1X which delivers data only CDMA-1X The first generation of CDMA 2000 CDMA Code Division Multiple Access CDO Community Dial Office CDP Cisco Discovery Protocol CDP Customized Dialing Plan CDPD Cellular Digital Packet Data CDPSK Coherent Differential Phase Shift Keying CDR Call Detail Record (OAM) CDR Call Detail Recorder CDR Call Drop Rate CDSL Customer Digital Subscriber Line CDT Central Daylight Time CDU Customer Data Unit CDV Cell Delay Variation (ATM) CDVT Cell Delay Variation Tolerance (ATM) CED Caller Entered Digits CEF Cisco Express Forwarding CEI Comparably Efficient Interconnection CEI Connection Endpoint Identifier (LAPD) CELL1 Cellular One CELP Code Excited Linear Prediction CELP Code Excited Linear Prediction (compression) CENTREX CENTral Exchange CEO Chief Executive Officer CEP Certificate Enrollment Protocol CEP Circular Error Probable CEPT Conference European on Post and Telecommunications CEPT Conference of European Postal and Telecommunications Administrations CER Cell Error Ratio (ATM) CERN European Council for Nuclear Research CERT Computer Emergency Response Team CES Circuit Emulation Service CES Connection Endpoint Suffix CESAR Customer's Enhanced System for Access Requests CET Cisco Encryption Technology CEV Controlled Environment(al) Vault CF Call Forwarding CF Coin First CFA Carrier Failure Alarm CFB Call Forwarding on Busy (SS) CFBNA Call Forwarding for Busy and NoAnswer CFN Call Forward Number CFNRy Call Forwarding on No Reply (SS) CFO Chief Financial Officer CFU/B/NR Call Forwarding Unconditional/Busy/No Reply CFU Call Forwarding Unconditional (SS) CGA Carrier Group Alarm CGB Circuit Group Blocking Message CGF Charging Gateway Function CGI Cell Global Identification (GSM) CGI Cell Global Identity (MCC + MNC + LAC + CID) CGI Common Gateway Interface CGI Common Gateway Interface (Protocol) CGM Computer Graphics Metafile CGSA Cellular Geographic Service/Serving Area CGU Circuit Group Unblocking Message CGW Customer Gateway CH Cell Header CHAP Challenge Handshake Authentication Protocol CHE Cable HeadEnd CHFP Certified Human Factors Professional CHI Conference on Human factors In computing systems CHO Choke Packet CHTML Compact Hyper Text Markup Language CI Carrier Interconnection CI Carrier to Interference ratio CI Cell Identity (GSM) CI Credit Information CI Customer Installation CIA Classical IP over ATM CIB CRC32 Indication Bit (DQDB, SMDS) CIBER Cellular Intercarrier Billing Exchange Roamer Record CIC Carrier/Circuit Identification Code CIC Country Indicator Code CICS Customer Information Control System CID Caller Identification CID Cell ID (GSM - UMTS) CID Channel ID CID Craft Interface Device CIDR Classless Interdomain Routing (IETF) CIDS Calling Identity Delivery & Suppression CIDX Chemical Industry Data Exchange CIF Client Interface Module (SZ) CIF Common Intermediate Format CIIII Computer Inquiry III (DOJ) CIM Computer Integrated Manufacturing CIO Chief Information Officer CIP Channel Interface Processor (Cisco) CIR Committed Information Rate CIR Committed Information Rate (FR) CIRC Cross Interleaved Reed-Solomon Code CISC Complex Instruction Set Computer CIT Collect Information Toll CIT Collect Information Tool CIT Computer Integrated Telephony CIU Communications Interface Unit CIX Commercial Internet eXchange CKL Circuit Location CKSN Ciphering Key Sequence Number (GSM) CKTINT Circuit Interworking software CL&F Common Look and Feel CL Connectionless CL Copper Loop CLASS Custom Local Area Signaling Services CLASS Custom Local Area Signaling Services (Bellcore) CLAW Common Link Access for Workstations CLC Carrier Liaison Committee CLC Common Language Code CLC Competitive Local Carrier CLCI Common Language Code Identifier CLEC Competitive Local Exchange Carrier CLEI Common Language Equipment Identifier CLF Common Language Facility CLFI Common Language Facility Identification CLI Caller ID CLI Command Language Interpreter CLI Command Line Interface (OAM) CLID Calling Line IDentification (ISDN, CLASS) CLIP Calling Line Identification Presentation (SS) CLIR Calling Line Identification Restriction (SS) CLLI Common Language Location Identifier/Identification CLLM Consolidated Link Layer Management (FR) CLNP Connectionless Network Protocol (ISO, ITU-T) CLNS Connectionless Network Service (ISO, ITU-T) CLP Cell Loss Priority CLP Cell Loss Priority (ATM, CLP Bit) CLR Clear CLS Cisco Link Services CLS Connectionless Service CLSI Cisco Link Services Interface CLTP Connectionless Transport Protocol CLTS Connectionless-mode Transport Service CM Cable Modem CM Communications Module (AT&T 5ESS) CM Conference Manager CM Connection Management CM Connection Manager CMC Cellular Mobile Carrier CMDB Centralized Message DataBase CMDR Call Management Detail Records CMDS Centralized Message Distribution System CMI Coded Mark Inversion CMI Control Mode Idle CMIP Common Management Information Protocol (ISO, ITU-T) CMIS Common Management Information Service/System CMISE Common Management Information Service Element (ISO, ITU-T) CMNM Cisco MGC Node Manager CMNS Connection-Mode Network Service CMOL CMIP Over LLC CMOS Complementary Metal-Oxide Semiconductor CMOT CMIP Over TCP/IP CMP Communications Module Processor CMRS Commercial Mobile Radio Services CMS Call Management System {AT&T) CMT Connection Management (FDDI) CMTS Cable Modem Termination System CMU Carnegie Mellon University CN Common Name CNA Customer Number Address CNAB Call Name Delivery Blocking CNCA Carrier Non-Compatible Applications CNE Certified NetWare Engineer CNG CalliNG CNM Customer Network Management CNMA Customer Network Management Agent CNS/AD Cisco Networking Services for Active Directory CNS Complementary Network Service(s) CO-ACD Central Office Automatic Call Distributor CO-LAN Central Office-Local Area Network CO Central Office CO Connection-Oriented COAX COAXial COC Central Office Connection COCOT Customer Operated COin Telephone Code CODEC Coder plus DECoder CODEC COder-DECoder COFA Change of Frame Alignment COI Community Of Interest COLA Cost Of Living Adjustment COLA Customer On Line Authentication COLAN Central Office-based LAN COLP Connected Line Identification Presentation (SS) COLR Connected Line Identification Restriction (SS) COM Continuation of Message (DQDB, SMDS) COMC Communications Controller (SNA) COMPANDER COMpressor/exPANDER CONF CONFerence CONP Connection-Oriented Network Protocol CONS Connection-Oriented Network Service (ISO, ITU-T) COP Customer Ordering Platform COPI Collector Plug-In COPS Common Open Policy Service COPT Customer Owned Public Telephone CORBA Common Object Request Broker Architecture COS Class Of Service COS Corporation for Open Systems COSE Common Open Software Environment COSMOS Central Office System for Mainframe Operations COT Central Office Terminal COT Continuity Test Message COTS Commercial Off-the-Shelf (stuff) CP Cell Payload CP Connection Point CP Control Point CP Control/Coordination Processor CP Customer Premises CPC Call Processing Control CPC Calling Party Category CPCN Certificate of Public Convenience and Necessity CPCS Call Processing Control System CPCS Common Part Convergence Sublayer CPE Certified Professional CPE Customer Premise(s) Equipment CPG Call Progress Message CPI/C Common Programming Interface for Communication CPI Computer-PBX Interface CPI Consumer Price Index CPM Cost Proxy Model CPNI Customer Proprietary Number/Network Information CPNIE Called Party Number Information Element CPP Calling Party Pays CPP Combinet Proprietary Protocol (Cisco) CPR Core Process Re-engineering CPS Customer Premises System CPS Cycles Per Second CPU Central Processor/Processing Unit CPUC California Public Utilities Commission CQ Custom Queuing CQM Circuit Group Querry (SS7) CQR CQM Response (SS7) CR Call Reference CR Certificate Request CR Conditional Requirement CR Connect Request (SS7) CRA Circuit Reservation Acknowledgment Message CRC Cyclic Redundancy Check(word) CRC Cyclical Redundancy Checking CRED Credit Card Calling CREF Connection Refused CRF Concentrator Relay Function (ATM) CRIS Customer Records Information System CRL Certificate Revocation List CRM Circuit Reservation Message CRM Customer Relationship Management CRP Customer Routing Point CRS Cell relay Service CRS Configuration Report Server CRT Cathode Ray Tube CRTC Canadian Radio-television and Telecommunications CRU Customer Retention Unit CRV Call Reference Value (Q.931) CS-1 Capability Set 1 CS-ACELP Conjugate Structure Algebraic Code Excited Linear Prediction (compression) CS-PDU Convergence Sub-layer PDU CS1 Capabilities Set 1 CS2 Capabilities Set 2 CS Call Segment CS Capability Set CS Carrier Services CS Configuration Server Module(SZ) CS Convergence Sublayer (ATM) CSA Call path Services Architecture CSA Canadian Standards Association CSA Carrier Serving/Service Area(s) CSA Custom Service Arrangement CSAP Core Service Access Point CSB Customer Service Bureau CSC Circuit Supervision Control CSC Common Signaling Channel CSC Customer Service Center CSDC Circuit Switched Digital Capability CSDN Circuit Switched Data Network CSDS Circuit Switched Digital Service CSDU Core Service Data Unit CSE CAMEL Service Environment CSFS Customer Support Forwarding Service CSH Convergence Sublayer Header CSI Called Subscriber Identification CSIMA Client Side Image Map Authoring CSLIP Compressed Serial Link Internet Protocol CSM Call Switching Module CSM Cisco Service Management system of Operations, Administration, Maintenance, and Provisioning (OAM&P) CSMA/CA CSMA with Collision Avoidance (LAN) CSMA/CD Carrier Sense Multiple Access with Collision Detection CSMA/CD CSMA with Collision Detection (LAN) CSMA Carrier Sense Multiple Access CSMA Carrier Sense Multiple Access (LAN) CSN Central/Customer Service Node CSNET Computer Science Network CSNP Complete Sequence Number PDU CSO Composite Second Order CSP Chip Scale Package CSPDN Circuit Switched Public Data Network CSR Consistency Check Request CSR Customer Service Record CSR Customer Service Representative (OAM) CSS Customer Support System CST Central Standard Time CST Convergence Sublayer Trailer CST Cooperative Scheduled Testing CSTA Computer Supported Telecommunications Application CSU Channel Service Unit CSV Comma Separated Values CT0 Zero generation cordless telephony (analogue technology and severe limitations in terms of range and security) CT1 First generation cordless telephony (greater range and security) CT2-CAI Second generation cordless telephony-common air interface CT2 Second generation cordless telephony (digital with greater range, improved security and a wide range of new functionalities) CT Call Transfer CT Call Type CT Channel Termination CT Common Transport CT Computer Telephony CT Computerized Tomography CT Cordless Telephone/Telephony CTA Cordless Terminal Adaptor (DECT) CTB Composite Triple Beat CTD Cell Transfer Delay (ATM) CTI Computer Telephony Integration CTIA Cellular Telecommunications Industry Association CTM Cordless Terminal Mobility CTR Common Technical Regulation, part of the ETSI standardization process CTS Clear To Send CTS Clear To Send (EIA-232-E) CTS Common Transport Semantic (IBM) CTU Channel Test Unit CTX CenTreX system number CU Channel Unit CU Coding Unit CU Control Unit CUG Closed User Group (GSM) Custom Service Arrangement CV Coding Violation CVM Cluster Veritas Volume Manager CVN Customer Virtual Network CVR Circuit Validation Response Message CVSD Continuously Variable Slope Delta Modulation CVSDM Continual Variable Slope Delta Modulation CVT Circuit Validation Test Message CW Call Waiting (SS) CWAF Cisco Web Application Framework CWC Center Weight Control CWID Call Waiting IDentification service CWIDO Call Waiting IDentification with Options service CxBus Cisco Extended Bus SMBZ - SaMBoZaur - test for propagation of define: