Here are the most common telecom acronyms starting with C from the world of computer networking.

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Acronym Description
C&I Construction & Installation
C&P The Chesapeake and Potomac Telephone Company (ies)
C&R Code and Routing
C.mmp Carnegie Multi-Mini Processor
C2 Command and Control
C3 Communications Control Center (Suntel Computer)
C3I Command, Control, Communications, and Intelligence
CA Cabling Assignments
CA Collision Avoidance
CAC Calling-card Authorization Computer
CACM Communications of the Association for Computing Machinery
CACS Centralized Alarm Control System
CACS Computer Assisted Collection System
CACS Customer Account Collection System
CACS Customer Administration Center System
CAD Calling Area Database
CAD Computer-Aided Design
CADS Code Abuse Detection System (also known as ACD)
CAE Cable Acceptance Engineer
CAE Computer-Aided Education
CAE Computer-Aided Engineering
CAI Computer-Assisted Instruction (also Computer-Aided Instruction)
CAL Computer-Aided Learning
CALC Customer Access Line Charges
CALRS Centralized Automatic Loop Reporting System
CAM Computer-Aided Manufacturing
CAMA Centralized Automatic Message Accounting
CAMP Control Administration and Maintenance Position
CAMS Customer Account Maintenance System
CAN Cancel Character
CAN Computer Architecture News
CanF Cancel From
CANN Customer Announcement
CanT Cancel To
CAP Competive Access Provider
CAP Customer Administration Panel
CAPS Code Abuse Prevention System
CAR Computer Access Restriction
CARE Computer-Aided Reliability Estimation
CARE Customer Account Reconciliation
CAROT Centralized Automatic Reporting On Trunks
CARS Community Antenna Relay Service
CARTS Corporate Access Rates and Tariff System
CAS Centralized Attendant Service
CAS Commission Accounting System
CAS Craft Access System
CAS Customer Administration System
CASE Computer-Assisted Software Engineering
CAT Call Area Tables
CAT Centrex Access Treatment
CAT Computer-Assisted Tomography
CAT Customer Access Treatment
CAT Customer Administration Terminal
CATP Conditional All Tests Pass
CATRS Compressed Analysis Total Requirements Statement (IS)
CATS Customer Accounts Transition System
CATS Customer Activation Tracking System
CATTS Centralized Automatic Trunk Testing System
CATV Cable Television
CAUSE College and University System Exchange
CB Channel Bank
CB Corporate Billing System
C-band 3.9 GHz to 6.2 GHz
CBCT Customer-Bank Communication Terminal
CBD Commerce Business Daily
CBE Computer-Based Education
CBEMA Computer and Business Equipment Manufacturers Association
CBIC Complimentary Bipolar Integrated Circuit
CBMG Central Business Marketing Group
CBMS Computer Based Message Systems
CBQ Call-back Queuing
CBQMP Call-back Queuing Maximum Priority
CBQPPT Call-back Queuing Priority Promotion Timer
CBQRA Call-back Queuing Route Advance
CBQRAT Call-back Queuing Route Advance Timer
CBQSP Call-back Queuing Start Priority
CBR Constant Bit Rate
CBS Carrier Billing System
CBS Conceptual Business System (IS)
CBT Computer Based Training
CBX Computerized Branch Exchange (Rolm)
CBYD Call Before You Dig (NOCC)
CC Central Controller
CC Coin Collect
CC Conference Coordinator
CC Cost Center
CCB Change of Control Board (MFG)
CCB Configuration Control Board
CCBs Call Condensed Blocks
CCC Central Control Complex
CCC Clear Channel Capability
CCC Country Code
CCD Customer Commit Date ***
CCD Charge Coupled Device
CCD Cross-connect Device (telephony)
CCER Customer Circuit Equipment Request
CCH Connections per Circuit Hour
CCI Controlled Cryptographic Item
CCIA Computer and Communications Industry Association
CCIR International Radio Consultative Committee
CCIS Common Channel Interoffice Signaling (network)
CCIS-BS Common Channel Interoffice Signaling – Banded Signaling
CCIS-DS Common Channel Interoffice Signaling – Direct Signaling
CCITT International Telegraph and Telephone Consultative Committee
CCM Common Channel Manager
CCM Communication Control Module
CCM Computer Controlled Manager
CCMC Customer Control Management Center
C-conditioning A type of conditioning that controls attenuation, distortion, and delay distortion to specific limits.
CCR Capitol Commitment Requisition
CCR Customer Control Reconfiguration
CCS Call Completion Seconds
CCS Centi (Hundred) Call Seconds
CCS Common Carrier Systems
CCS Common Channel Signaling (AT&T)
CCS7 Common Channel Signaling System No. 7
CCSA Common Channel Signaling Arrangement
CCSA Common Circuit Switching Access
CCSA Common Control Switching Arrangement
CCSR Centrex Customer Station Rearrangement
CCSS Common Channel Signaling System
CCT Central Control Terminal
CCTV Closed Circuit Television
CCU Communications Control Unit
CCV Calling Card Validation
CD Call Detail
CD Circle Digit (CD0-CD9)
CD Circuit Description Document
CD Collision Detection
CD Connectivity Date
CD Control and Display Circuit
CD Country Direct
CD ROM Compact Disk Read-Only Memory
CDA Conceptual Design Area (IS)
CDAL Control and Diagnostic Access Link
CDAL Control Diagnostics Access Lead (AT&T)
CDAR Customer Dialed Account Recording
CDB Circuit Descriptor Block
CDC Control Data Corporation
CDCCP Control Data Communications Control Program (Control Data Corp.)
CDF Customer Distribution Frame
CDFI Communication Link Digital Facility Interface
CDFI Inter-Remote Switching Module Communication Link Digital Facilities Interface
CDI Code Index
CDI Control and Data Interface
CDL Computer Description Language
CDL Computer Design Language
CDMA Call Division Multiple Access
CDO Community Dial Office
CDP Certificate in Data Processing
CDR Call Data Record(ing)
CDR Call Detail Record
CDR Call Detail Record(ing)
CDR Call Detail Reporting
CDRID Call Detail Record Identification
CDRL Contract Data Requirements List
CDRL Contract Data Requirements List
CDS Conceptual Data Store (IS)
CDT Call Data Transmitter
CE Coaxial Eliminator
CEAS Corporate Exchange Architecture System
CEC Corporate Education Center
CEF Cable Entrance Facility
CEI Comparably Efficient Interconnection
Centrex Central Exchange
CEO Carrier End Office
CEO Chief Executive Officer
CEPA Civil Engineering Programming Applications
CEPT Conference of European Postal and Telecommunications Administration
CERT Character Error Rate Testing
CES Coaxial Elimination System
CES Conceptual Environmental Statement (IS)
CES Customer Evaluation Survey
CESS Coaxial Elimination and Switching System
CF Call Forwarding
CF Coin First
CFA Carrier Facility Alarm
CFAC Call Forwarding All Calls
CFB Call Forwarding Busy
CFBL Call Forwarding Busy Line
CFDA Call Forwarding Don’t Answer
CFE Contractor-Furnished Equipment
CFI Call Forwarding Intragroup
CFMS Construction Force Measurement System
CFNA Call Forwarding No Answer
CFR Code of Federal Regulations
CFU Call Forwarding Universal
CFW Call Forwarding
CG Computer Graphics
CGA Carrier Group Alarm
CGA Color Graphics Adaptor
CHARS Customer Heirarchy and Reporting System
CHARS Customer Hierarchy and Reporting System (IPS)
CHG Charging
CHIPS Call History Information Processing System
CI Carrier Interconnect
CI Command Interpreter
CI Command Interpreter
CI Control Interface
CI Customer(-approved) Information
CIA Central Intelligence Agency
CIA Competitive Intelligence Association
CIAS Circuit Inventory and Analysis System
CIB Centralized Intercept Bureau
CIC Carrier Identification Code
CIC Circuit Identification Code
CICA Competition In Contracting Act
CICS Customer Information Control System
CID Critical Indicator Display
CID Customer Interactive Dialing
CIF Carrier Interconnection Feature
CIF Common Intermediate Format
CII Compagnie Internationale pour Informatique
CI-II Computer Inquiry II
CI-III Computer Inquiry III
CIM Computer Input from Microfilm
CIM Computer-Integrated Manufacturing
CINCC Customer Information Network Communication and Control
CIPS Canadian Information Processing Society
CIR Circuit Interruption Report
CIR Commited Information Rate
CIS Critical Indicator Screen
CIS Customer Information System
CIS Customer Information System (CS)
CIS Customized Intercept System
CISI Compagnie Internationale de Services et Informatique
CISR Customer Installation and Service Results
CIT Contract Invoice Transmittal
CIT Craft Interface Terminal
CIU Control Interface Unit
CKT Circuit
CL Customer Location
CLAS Customer Loop Assignment
CLASS Customer Local Area Signaling Service
CLC Circuit Line Card
CLC Communications Line Controller
CLDN Calling Line Directory Number
CLEI Common Language Equipment Identification (or Information)
CLFI Common Language Facility Identifier
CLI Calling Line Identification
CLI Change Level Indicator
CLI Compression Labs, Inc.
CLIN Contract Line Identification Number
CLIN Contract Line Item Number
CLIN Contract Line Item Number
C-link The wired connection between the stage 0 switch and the stage 1 switch in a Line Junctor Switch frame or Trunk Junctor Switch frame.
CLLI Common Language Location Identifier
CLM Corporate Logical Model (IS)
CLNAP Connectionless Network Access Protocol
CLNS Connectionless Network Service
CLP Cell Loss Priority
CLP Communications Line Processor
CLR Circuit Layout Record
CLR Circuit Layout Record
CLS Combined Link Set
CLSF Connectionless Server Function
CLSR Computer Law Service Reporter
CM Communications Manager
CM Communications Module
CM Computing Module
CM Configuration Management
CM Connection Memory
CM1 Communications Module Model 1
CM2 Communications Module Model 2
CMC Central Message Controller
CMC Central Message Controller
CMC Change Management & Control (NOCC)
CMC Communications Module Control
CMC Construction Management Center
CMCC Central Management and Control Center
CMCS Customer Message Center System
CMCU Communications Module Control Unit
CMD Credit Management Department
CMDR Command Reject
CMI Coded Mark Inversion
CMI Computer-Managed Instruction
CMIP Current Month Invoicing Process
CMM Corporate Market Management
CMOS Complementary Metal-Oxide Semiconductor
CMP Communications Module Processor
CMS Central Message System
CMS Centralized Message Service
CMS Compliance Monitoring System
CMS Control Monitor System
CMS Conversational Monitor System
CMSS Customer Management Support Services
CMU Channel Monitoring Unit
CN Change Notice
CND Customer Number Development
CNDC Customer Network Design Center
CNDC Customer Network Design Center (CN)
CNI Common Network Interface
CNI/IMS Common Network Interface/Interprocessor Message Switch
CNM Customer Network Management
CNMC Client Network Management Center
CNO Chief of Naval Operations
CNQD Corporate Network Quality Department
CNR Carrier-to-Noise Ratio
CNS Complementary Network Services
CNS Corporate Network Services
CO Central Office
CO LAN Central Office Local Area Network
COAM Customer Owned and Maintained
COB Close of Business
COBOL Common Business Oriented Language
COC Central Office Connection
COD Cutoff on Disconnect
CODASYL Conference on Data Systems Languages
Codec Coder-decoder (analog-to-digital and digital-to-analog)
COEES Central Office Equipment Engineering System
COER Central Office Equipment Report
COESS Central Office Equipment Estimation System
COG Centralized Operations Group
COIC Central Office Installation Coordination
COM Computer Output Microform
COM Computer Output on Microfilm
COMP Continuity of Management Plan
Compandor Compressor-expandor
COMPAS Customer Order Maintenance Processing Accounts System
Compool Communications pool
COMSAT Communications Satellite Corporation
COMSEC Communications Security
COMSYS Communications System
CONTU Commission on New Technological Uses of Copyrights
CONUS Continental United States
COOP Continuity of Operations Plan
COP Cutover Plan
COPE Construction Operations Property and Engineering
COR Class of Restriction
COR Contracting Officer’s Representative
CORC Customer-Originated Recent Change
COS Class of Service
COS Class of Service
COS Corporation for Open Systems
COSATI Committee on Scientific and Technical Information
COSI Class of Service Index
COSINE Cooperative Service in Education
COSMIC Common Systems Main InterConnecting (frame)
COSMIC Computer Software Management and Information Center
COSO Class of Service Override
COSS Class of Service Screening
COSS Class of Service Screening
COT Central Office Technician
COT Central Office Terminal
COT Customer Originated Trace
COTR Contracting Officer’s Technical Representative
CP Circuit Pack
CP/M A proprietary applications software
CPA Coordinated Purchase Agreement
CPA Customer-Provided Access
CPAM Competitive Provisioning and Maintenance
CPB Code Point Blocking
CPC Card Programmed Calculator
CPD Central Pulse Distributor
CPE Customer Premises Equipment
CPH Cost per Hour
CPI Calling Party Identification
CPI Central Processor Intervention
cpi Characters per Inch
CPI Computer-to-PBX Interface
CPI-W Consumer Price Index
CPM Control Program for Microcomputers
CPM Cost per Minute
CPM Cost Per Minute
CPM Critical Path Method
CPMC Circuit Pack Microcode
CPP Call Processing Programs
CPR Continuing Property Records System
CPS Call Processing Software
cps characters per second
CPS Customer Premises System
CPSC Consumer Product Safety Commission
CPSK Coherent Phase-Shift Keying
CPTD Call Progress Tone Detector
CPU Central Processing (or Processor) Unit
CQS Contractor Qualification Statement
CR Call Reference
CR Circuit Reliability
CR Coin Return
CR Communications Representative
CR Corporate Repository (IS)
CR Customer Requirements (IS)
CRA Call Record Assembler
CRAB Circuit Repair and Analysis Bureau (NOCC)
CRAM Card Random Access Memory
CRB Customer Records and Billing
CRC Corporate Records Center
CRC Cyclical Redundancy Check(ing)
CRDB Corporate Reporting Database
CRI Call Reconnect Identifier
CRI Criterion Reference Instruction
CRI Criterion Referenced Instruction
CRIS Customer Record/Inventory System (Suntel C3 computer system)
CRIS Customer Records Information System
CRKS Circuit Record Keeping System
CRL Cable Running List
CRQ Call Request
CRS Centralized Results System
CRSAB Centralized Repair Service Answering (or Attendant) Bureau
CRT Cathode Ray Tube
CRUD Create, Read, Update and Delete
CS Call Seconds
CS Call Store
CS Circuit Schematic
CS Convergence Sublayer
CSC Cell Site Controller
CSC Circuit-Switching Center
CSC Computer Security Center
CSC Customer Service Center
CSC Customer Support Center
CSD Circuit-Switched Data
CSD Communications Systems Division
CSDC Circuit-Switched Digital Capability
CSDDS Circuit-Switched Digital Data Service
CSDT Circuit-Switched Digital Transmission
CSE Computer Science and Engineering
CSES Consecutive Severely Errored Seconds
CSF Critical Success Factor
CSG Consumer Services Group
CSIS Corporate Security Information Security
CSM Channel Supervision Message
CSM Channel Supervision Messages
CSMA Carrier Sense Multiple Access
CSMA/CD Carrier Sense Multiple Access with Collision Detection
CSMDR Centralized Station Message Detail Recording
CSMS Customer Service Management System
CSO Customer Service Office
CSR Customer Service Representative
CSR Customer Service Representative
CSR Customer Station Rearrangement
CSR Series Completion Remove/Replace (messages)
CSSO Class of Service Screening Override
CST Call Set-up Time
CSTL Coin Station Test Line
CSU Channel Service Unit
CSU Customer Service Unit
CT Computed Tomography
CTAC Customer Technical Assistance Center
CTDB Corporate Tariff Data Base
CTIU Coaxial-to-Terminal Interface Unit
CTP Consolidation Test Plan
CTRAP Customer Trouble Report Analysis Plan
CTS Carrier Transit Switch
CTS Clear to Send
CTS Control Time Slot
CTSS Compatible Time-Sharing System
CTTU Centralized Trunk Test(ing) Unit
CTX Centrex
CU Control Unit
CU Controller Unit
CU Customer Unit
CUG Closed User Group
CUIF Control Unit Interface
CUM Cumulative
CUMREC College and University Machine Record Conference
CUT Code/Unit Test

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