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AB-2 ABBREVIATIONS
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CO central office
CRC cyclic redundancy check
CSM Centralized System Management
CSU customer service unit
DAC dial access code
DACS digital access and crossconnect system
DCE data circuit-terminating equipment
data communications equipment
DCIU data communications interface unit
DCS distributed communications system
DDS DATAPHONE digital service
DID direct inward dialing
DMI digital multiplexed interface
DNIS dialed number identification service
DOD direct outward dialing
DSC dedicated switched connection
DSU data service unit
DTE data terminal equipment
DTMF dual-tone multi-frequency (dialing)
E&M ear and mouth (signaling)
E-INOS Enhanced Interactive Network Optimization System
EIA Electronic Industry Association
ENP extension number portability
EPSCS Enhanced Private Switched Communications Service
ESF extended super frame