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CALC Customer Access
Line Charger
CAP Competitive
Access Provider
CBR Continuous Bit
Rate
CCIS Common-Channel
Interoffice Signaling
CCS Centi-Call
Seconds
CCS Common-Channel
Signaling
CCSA Common-Control
Switching Arrangement
CDMA Code Division
Multiple Access
CMIP Common
Management Information Protocol
CO Central Office
COC Central Office
Connections
CPU Central
Processing Unit
CSDC
Circuit-Switched Digital Capability
CSMA/CD Carrier Sense
Multiple Access With Collision Detection
CSR Centrex Station
Rearrangement
CSU Channel Service
Unit
