Acronym

Description

D

Delivery date

D

Destination (lamp)

D channel

Delta channel (Packet-switched channel of 16 kbps for either data or signaling)

D conditioning

A type of conditioning that controls harmonic distortion and signal-to-noise ratio to specific limits.

D&F

Determination and Findings

D*

Specific detectivity, "D star" (detector performance figure)

D/A

Digital to analog

D1

D Channel Bank

D2

D channel bank

D3

D channel bank

D4

D channel bank

D5

D channel bank

DA

Data Analyst (IS)

DA

Directory Assistance

DAA

Data Access Arrangement

DAB

Demand Assigned Bus

DACS

Data Acquisition and Control System

DACS

Data Administration Control System

DACS

Digital Access and Cross-Connect System

DACS

Digital Access Control System (NOCC)

DACS

Directory Assistance Charge System

DACS

Directory Assistance Charging System

DAD

DIU Assembler/Disassembler

DAF

Dedicated Access Facility

DAF

Destination Address Field

DAL

Dedicated Access Line

DAL

Dedicated Analog Line

DAM

Direct Access Method

DAMA

Demand Assignment Multiple Access

DANI

Dedicated Automatic Numbering Identification

DAP

Distributed Array Processor

DAR

Defense Acquisition Regulations

DARC

Data Analysis and Remote Control

DARPA

Defense Advanced Research Projects Agency

DAS

Digital Analysis

DAS

Digital Analysis Selector

DAS

Directory Assistance System

DASD

Data Accesss Storage Device

DAT

Day and Time

DAV

Data Above Voice

DAX

Data Acquisition and Control

DB

Data Base (IS)

dB

Decibel

DB800

800 Translations Management System

DB900

900 Translations Management System

DBA

Data Base Administrator

DBA

Data Base Analyst (IS)

DBEN

Data Bus Enable

DBG

Diversified Brands Group (S)

DBIB

Dual Bus Interface Board

DBM

Database Manager (or Management)

dBm

Decibels referenced to the milliwatt scale/Power level measurement unit (0 dBm = 1 milliwatt at 1000 Hz terminated by 600 ohms impedence)

DBMS

Database Management System

dBrn

Decibels above reference noise

dBrnC

Weighted noise power in dBrn, measured by a noise measuring set with C-message weighting

DBS

Direct Broadcast Satellite

DBTG

Data Base Task Group

DBU

Dial Back-Up

DC

Data Collection

DC

Data Communications

DC

Design Close

DC

Device Controller

DC

Direct Connect

dc

Direct Current

DC

District of Columbia

dc signaling

Signaling using direct current

DCA

Defense Communications Agency

DCA

Digital Computer Association

DCA

Document Content Architecture

DCAA

Defense Contract Audit Agency

DCAOC

Defense Communications Agency Operations Center

DCC

Data Country Code (Four-digit/ISO)

DCC

Digital Cross-connect

DCC

Document Control Center

DCCS

Direct Common Channel Interoffice Signaling

DCD

Design Change Document

DCE

Data Communications Equipment

DCEC

Defense Communications Engineering Center

DCH

D Channel Handler

DCI

District Cablevision, Inc.

DCIS

Destination Common Channel Interoffice Signaling (AT&T)

DCIS

Direct Common Channel Interoffice Signaling

DCLU

Digital Carrier Line Unit

DCM

Digital Carrier Module

DCMS

Digital Cross-Connect Management System

DCN

Data Communications Network

DCN

Data Communications Network

DCO

Data Collection Operations

DCO

Drafting Change Order

DCON

Drafting Change Order Numbers

DCP

Data Communication Processor

DCP

Database Control Point

DCP

Digital Communications Protocol

DCPSK

Differentially Coherent Phase Shift Keying

DCPTA

Database Control Point Transport Application

DCPU

Directed Call Pickup Nonbarge-in

DCR

Directory Charge Recording (trunks)

DCS

Data Carrier System

DCS

Data Control Systems

DCS

Defense Communications System

DCS

Document Control System

DCSS

Digital Conference and Switching System

DCT

Design/Code/Test

DCT

Digital Carrier Trunk

DCT

Discrete Cosine Transform

DCTE

Data Circuit-Terminating Equipment

DCTN

Defense Commercial Telecommunications Network

DCTS

Dimension Custom Telephone Service

DCTU

Digital Carrier Trunk Unit

DCTU

Directly Connected Test Unit

DD

Direct Dialed

DDA

Domain Defined Attributes

DDAP

Detailed Distribution Area Plans

DDCMP

Digital Data Communications Message Protocol (Digital Equipment Corp.)

DDD

Digital Drop and Insert

DDD

Direct Distance Dialing

DDI

Direct Digital Interface

DDL

Data Definition Language

DDL

Data Definition Language

DDL

Derived Data Link

DDM

Data Definition Module

DDN

Defense Data Network

DDP

Distributed Data Processor

DDS

Dataphone Digital Service (AT&T trademark)

DDS

Digital Data Service (Bell Atlantic trademark)

DDS

Digital Data System

DDSBS

Duplex Dual Serial Bus Selector

DDSD

Delay Dial Start Dial

DDU

Disk Drive Unit

DE

Discard Eligible

DEC

Digital Equipment Corporation

DECCO

Defense Commercial Communications Office

DEPIC

Dual Expanded Polyethylene Insulated Cable

DES

Data Encryption Standard

DETAB

Decision Table (language)

DF

Distribution (ing) Frame

DFA

Digital Facilities Access Cabinet

DFARS

Department of Defense Federal Acquisition Regulations Supplement

DFB

Distributed Feedback (laser diode)

DFC

Digital Facility Center

DFC

Disk File Controller

DFD

Data Flow Diagram (IS)

DFI

Digital Facility (ies) Interface

DFMS

Digital Facility Management System

DFT

Discrete Fourier Transform

DFTAC

Distributing Frame Test Access Controller

DGMS

Data Generation and Management System

DGT

DIGITONE

DHNR

Dynamically Hierarchical Network Routing

DI

Data Interface

DI

Digital Interface

DI

Document Index

DI

Document Index

DIA

Defense Intelligence Agency

DIA

Document Interchange Architecture

DIAC

Defense Intelligence Agency Center

Dibit

a group of two bits

DID

Direct Inward Dialing (or Dialed)

DIF

Document Interchange Format

Digroup

Digitally multiplexed group of 24 channels

DINA

Distributed Intelligent Network Architecture

DIOD

Direct Inward Outward Dialing (or Dialed)

DIP

Dual In-line Package

DIP

Dual In-line Pin

Diplex

Simultaneous transmission/reception of two signals over a circuit or channel

DIRP

Device Independent Recording Package

DIS

Directory Information (Sub)system

DIS

Draft Information Standard

DISA

Direct Inward System Access

DISCO

Defense Industrial Security Clearance Office

DISCO

Document Imaging System for Correspondence Operation

DIU

Digital Interworking Unit (Northern Telecom Inc.)

DIVA

Digital inquiry

DIVCOD

Division Code Table

DIVRTE

Division Route Table

DIW

D-Inside Wire

DLA

Defense Logistics Agency

DLAOC

Defense Logistics Agency Operations Center

DLC

Data Line Card

DLC

Digital Loop Carrier

DLCF

Data Link Control Field

DLCI

Data Link Connection Identifier

DLCM

Digital Level Control Module

DLE

Data Link Escape Character

DLH

Distributed Line Hunting

DLI

Dual-Link Interface

DLL

Downline Load

DLO

Data Link Occupied

DLP

Data Link Processor

DLP

Decode Level Point

DLSE

Dial Line Service Evaluation

DLTU

Digital Line and Trunk Unit

DM

Data Memory

DM

Data Module

DM

Delta Modulation

DMA

Defense Mapping Agency

DMA

Direct Memory Access

DMAC

Direct Memory Access Controller

DMERT

Duplex Multi-Environment Real Time

DMERT

Duplex Multienvironment Real-Time Operating System

DMF

Database Maintenance Facility (CN)

DMI

Digital Multiplexed Interface

DMI

Dual Message Interface

DML

Data Manipulation Language

DMO

Data Modification Order

DMOPRO

Data Modification Process

DMP

Data Modification Producer

DMR

Defective Material Report (MFG)

DMS

Digital Multiplex System

DMS-100

Digital Multiplex System 100

DMS-MTX

Digital Multiplex System - Mobile Telephone Exchange

DMU

Data Manipulation Unit

DN

Directory Number

DN

Directory Number

DNA

Digital Network Architecture

DNAR

Directory Number Analysis Reporting

DNH

Directory Number Hunting

DNI

Digital Network Interconnect(ing) (bay/frame)

DNIC

Data Network Identifier Code

DNIS

Dialed Number Identification Service

DNPA

Data Numbering Plan Area

DNPIC

Directory Number Primary InterLATA Carrier

DNS

Domain Name Server

DOA

Dial Office Administration

DOC

Department of Commerce

DOC

Dynamic Overload Control

DoD

Department of Defense

DOD

Direct Outward Dialing (or Dialed)

DOE

Department of Energy

DOEd

Department of Education

DOI

Department of the Interior

DOIM

Director of Information Management

DOJ

Department of Justice

DOL

Department of Labor

DOPAC

Disk Oriented Property And Cost

DOPS

Digital Ordering and Planning System

DOR

Denied Originating Service

DOS

Disk Operating System

DOS/VS

Disk Operating System/Virtual Storage

DOSUM

Daily Operations Summary

DOV

Data Over Voice

DP

Data Processing

DP

Detailed Procedures

DP

Dial Pulsing (or Dial Pulse)

DPA

Delegation of Procurement Authority

DPA

Digital Port Adapter

DPAC

Dedicated Plant Assignment Card

DPAT

Dialing Plan Access Treatment

DPC

Destination Point Code

DPC

Destination Point Code

DPC

Disk Power Cabinet

DPCC

Disk Panel Control Cabinet

DPCM

Differential Pulse Code Modulation

DPFT

DIRP Processing File Transfer

dpi

Dots per inch (used with dot matrix printers)

DPIDB

Directly Connected Peripheral Interface Data Bus

DPL

Digital Private Line

DPLB

Digital Private Line Billing System

DPM

Division Plant Manager

DPMA

Data Processing Management Association

DPMR

Digital Performance Monitoring Report

DPN

Digital Packet Network (Northern Telecom Inc.)

DPO

Dial Pulse Originating

DPP

Distributed Processing Peripheral

dpps

Data Packets per Second

DPSK

Differential Phase Shift Keying (or Keyed) Modulation

DPT

Digital Pad Table

DQDB

Distributed Queue Dual Bus

DQM

Data Quality Monitor

DQP

Data Qualifier Packet

DR

Distinctive Ringing

DRA

Digital Recorded Announcement

DRAM

Digital Recorded Announcement Machine

DRAM

Dynamic Random Access Memory

DRD

Disaster Recovery Director

DRE

Directional Reservation Equipment (Northern Telecom Inc. DMS-200)

DRIP

Device Recording Independent Package

DRO

Destructive Read-Out

DRO

Disaster Recovery Organization

DRP

Disaster Recovery Plan

DRS

Data Rate Selector

DRS

Digital Reference Signal

DRS

Draft Requirements Statement (IS)

DRS-8

Digital Radio System (Northern Telecom Inc.)

DRTLs

Dial Repeating Trunk Lines

DRTT

Dial Repeating Tie Trunk

DRZ

Directionalization

DS

Data Store

DS

Dead System (alarm)

DS

Design Statement (IS)

DS

Direct Signaling

DS0

Digital Signal Level 0

DS1

Digital Signal Level 1, 1.544 Mbps; 24 PCM channels using North American signaling format (equivalent to T1) (Also know as HICAP Service)

DS1C

3.152 Mbps; 48 channels (equivalent to T1C or two DS1s)

DS2

Digital Signal Level 2, 6.312 Mbps; 96 channels (equivalent to T2 or four DS1s)

DS3

Digital Signal Level 3, 44.736 Mbps; 672 channels (equivalent to T3 or 28 DS1s)

DS30

Digital Signal Level 30, 2.56 Mbps; digital switching 30 PCM voice channels serving the network from the controllers

DS30A

Digital switching 30 PCM voice channels serving the controller from the peripherals

DS3C

90 Mbps; 1344 channels (equivalent to T3C or two DS3s)

DS3D

135 Mbps; 2016 channels (equivalent to T3D or three DS3s)

DS3E

180 Mbps; 2688 channels (equivalent to T3E or four DS3s)

DS4

Digital Signal Level 4, 274 Mbps; 4032 channels (equivalent to T4 or six DS3s)

DSA

Data Set Adapter

DSAP

Directory Scope Analysis Program

DSAS

Dataphone Select-A-Station

DSBAM

Double Sideband Amplitude Modulation

DSC

Data Set Cabinet

DSC

Digital Service Circuit

DSC

Direct Satellite Communications

DSCH

Dual Serial Channel

DSCP

Digital Service Circuit Pack/Port

DSE

Data Switching Exchange

DSE

Distributive System Environment

DSEA

Distribution Services Economic Analysis

DSI

Digital Speech Interpolation

DSL

Digital Subscriber Line

DSM

Data Switching Module

DSN

Defense Switched Network

DSN

Digital Switched Network

DSP

Digital Signal Processor

DSP

Display System Protocol

DSR

Daily Status Report

DSR

Data Signaling Rate

DSR

Detail Study Report (IS)

DSS

Decision Support System

DSS

Decision Support System

DSS

Digital Switching Systems

DSS

Direct Station Selection

DSS-W

Defense Supply Service-Washington

DST

Data Switch Termination

DSU

Data Service Unit

DSU

Digital Service Unit

DSX

Digital Cross-Connect (frame)

DT

Dial Tone

DT

Downtime

DTC

Digital Trunk Controller

DTD

Dial Tone Delay

DTE

Data Terminal Equipment

DTE

Digital Trunk Equipment

DTF

Dial-Tone-First

DTI

Data Terminal Interface

DTI

Digital Trunk Interface

DTL

Diode-Transistor Logic

DTM

Daily Traffic Metering/Measurement Report

DTM

Denied Terminating Service (or Denied Termination)

DTM

Diagnostic Task Monitor

DTM

Diagnostic Task Monitor

DTMF

Dual Tone Multifrequency

DTP

Display Transport Protocol

DTR

Data terminal ready

DTS

Dedicated Transmission Service ***

DTS

Destination Traffic Separation (Northern Telecom Inc. DMS-100)

DTS

Digital Telecommunications Switching System (U.S. Department of the Treasury)

DTS

Digital Test Sequence

DTS

Direct Termination Service

DTSE

Data Subscriber Terminal Equipment

DTS-W

Defense Telecommunications Service - Washington

DTT

Digital Transmission Terminal

DTU

Data Transfer Unit

DU

Data Unit

DU

Design Unit

DUNBUILD

Dynamic Table Unbuilder option

DUNS

Data Universal Numbering System

DUPSS

Dial-Up Packet Switched Service

DUV

Data Under Voice

DVM

Data Voice Module

DVM

Data/Voice Multiplexer (or Multiplexing)

DVM

Digital Volt Meter

DX

Duplex signaling

DXS

Direct Extension Selection

DYANA

Dynamic Analyzer