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CII Call Identity Index
CIS Customized Intercept Service
CLASS Centralized Local Area Selective Signaling
CLASS Custom Local Area Signaling Service
CLDN Calling Line Directory Number
CLEI Common-Language Equipment Identification
CLI Calling Line Ident
CLID Calling Line IDentification
CLLI Common-Language Location Identification
CMAC Centralized Maintenance and Administration Center
CMC Construction Maintenance Center
CMDF Combined Main Distributing Frame
CMDS Centralized Message Data System
CMS Call Management System
CMS Circuit Maintenance System
CMS Communications Management Subsystem
CMS Conversational Monitoring System
CMT Cellular Mobile Telephone
CMU COLT Measurement Unit
CN Change Notice
CN/A Customer Name/Address
CNA Communications Network Application
CNAB Customer Name/Address Bureau
CNCC Customer Network Control Center
CNI Common Network Interface
CNMS Cylink Network Management System
CNS Complimentary Network Service
CO Central Office
COAM Customer Owned And Maintained
COC Circuit Order Control
COCOT Customer-Owned Coin-Operated Telephone
CODCF Central Office Data Connecting Facility
CODEC COder-DECoder
COE Central Office Equipment
COEES COE Engineering System
COLT Central Office Line Tester
COMSAT COMmunications SATellite
CONN CONNector
CONTAC Central Office NeTwork ACcess
CONUS CONtinental United States
CORNET CORperate NETwork
COSMIC COmmon Systems Main InterConnection frame system
COSMOS COmputerized System for Mainframe OperationS
COT Central Office Terminal
CP Control Program
CPC Cellular Phone Company
CPC Circuit Provisioning Center
CPD Central Pulse Distributor
CPE Customer-Premises Equipment
CPH Cost Per Hour
CPI Computer Private branch exchange Interface
CPM Cost Per Minute
CPMP Carrier Performance Measurement Plan
CPU Central Processing Unit
CRAS Cable Repair Administrative System
CRC Customer Record Center
CRC Cyclic Redundancy Check
CREG Concentrated Range Extension with Gain
CRFMP Cable Repair Force Management Plan
CRIS Customer Record Information System
CRS Centralized Results System
CRSAB Centralized Repair Service Answering Bureau
CRT Cathode Ray Tube
CSA Carrier Serving Area
CSACC Customer Service Administration Control Center
CSAR Centralized System for Analysis Reporting
CSC Cell Site Controller
CSDC Circuit Switched Digital Capability
CSNET Computer Science NETwork
CSO Central Services Organization
CSS Computer Sub-System
CSU Channel Service Unit
CTC Central Test Center
CTM Contac Trunk Module
CTMS Carrier Transmission Measuring System
CTO Call Transfer Outside
CTSS Cray Time Sharing System
CTT Cartridge Tape Transport
CTTC Cartridge Tape Transport Controller
CTTN Cable Trunk Ticket Number
CU Control Unit
CU Customer Unit
CU/TK Common Update/EQuipment system
CUCRIT Capital Utilization CRITeria
CVR Compass Voice Response
CWC City-Wide Centrex
D/A Digital to Analog
DA Directory Assistance
DACS Digital Access Cross-connect System
DACS Directory Assistance Charging System
DAIS Distributed Automatic Intercept System
DARC Division Alarm Recording Center
DARU Distributed automatic intercept system Audio Response Unit
DAS Directory Assistance System
DAS Distributor And Scanner
DAS-WDT Distributor And Scanner-Watch Dog Timer
DASD Direct Access Storage Device
DAV Data Above Voice
DB Decibel
DBA Data Base Administrator