AB-2ABBREVIATIONS

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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

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AT&T 2500 series Crc, Csm, Csu, Dacs, Dce, Dciu, Dcs, Dds, Did, Dmi, Dnis, Dod, Dsc, Dsu, Dte, Dtmf, Inos, Eia, Enp