Here are the most common telecom acronyms starting with E from the world of computer networking.

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Acronym Description
E Irradiance (or spectral irradiance)
E&M signaling A signaling arrangement characterized by the use of separate paths for the signaling and the voice signals (derived from “Ear” and “Mouth“)
E/MARCS Enhanced/Mechanized Assignment Record Conversion System
E/N/W Evening/Night/Weekend
E/W Engineered and Wired
E911 Enhanced 911 Service
EA Equal Access (switching)
EADAS Engineering and Administration Data Acquisition System
EADAS/DC Engineering and Administration Data Acquisition System – Data Collection
EADAS/NM Engineering and Administration Data Acquisition System – Network Management
EADP Enhanced Adjunct Data Processor
EAEO Equal Access End Office
EAI Electronic Associates, Inc.
EAI Emergency Action Interface
EAN Equipment Access Network
EAP Employee Assistance Program (HR)
EAROM Electrically Alterable Read Only Memory
EAS Equal Access Signaling
EAS Extended Service Area
EASOP Economic Alternative Selection for Outside Plant
EBCD Extended Binary Coded Decimal
EBCDIC Extended Binary Coded Decimal Interchange Code
EBCU Equivalent Basic Call Unit
EBF Emergency Bug Fix
EBMG Eastern Business Marketing Group
EBO Executive Busy Override
EBS Electronic Business Set
EBT Electronic Benefits Transfer
EBU Emitter Coupled Logic Bus Unit
E-BUS Emitter Coupled Logic Bus Unit Associated Bus Cables
EC Echo Canceller
ECA Exchange Carrier Association
ECC Error Correcting (or Correction) Code
ECD Equipment Configuration Database
ECIS Embedded Common Channel Interoffice Signaling
ECL Emitter-Coupled Logic
ECLIPS Enhanced Clearline Proposal System
ECMA European Computer Manufacturers Association
ECN Engineering Change Notice
ECORE Enhanced Core
ECP Enhanced Call Processing
ECR Electronic Cash Register
ECR Engineering Change Request (MFG)
ECS Error Correction Switch
ECS Extended Core Storage
ECSA Exchange Carriers Standards Association
ECT Echo Cancellation Technique
EDAL Engineering Documentation Authorization List
EDALS Extended Dedicated Access Line Service
EDC Error Detection and Correction
EDI Electronic Data Interchange
EDI Electronic Data Interchange (NOCC)
EDLCP External Data Link Communications Package
EDP Electronic Data Processing
EDSAC Electronic Delay Storage Automatic Calculator
EDSL Extended Digital Subscriber Line
EDSX Electronic Digital Cross Connect
EDUCOM Educational Communications (name of Interuniversity Communications Council)
EDVAC Electronic Discrete Variable Automatic Computer
EEHO Either End Hop Off
EEOC Equal Employment Opportunity Commission
EEPROM Electrically Erasable Programmable Read-Only Memory
EFRAP Exchange Feeder Route Analysis Program
EFS Error Free Seconds
EFTS Electronic Funds Transfer Systems
EGP Exterior Gateway Protocol
EHF Extremely High Frequency
EI External Input
EIA Electronic Industries Association
EICC Emergency Information and Coordinating Center
EIF External Interface File
EIOC Enhanced Input/Output Controller
EIOC Enhanced Input/Output Controller
EIR Employee Information Record (HR)
EIRP Effective Isotropic Radiated Power
EIS Expanded Inband Signaling
EJC Early Job Conference
EKTS Electronic Key Telephone Set
ELA Extended Line Adapter
ELI Extensible Language I
ELN Essential Line Service
ELP Encode Level Point
ELS Electronic Loop Segregation
ELST Electronic Loop Segregation Test
E-Mail Electronic Mail
EMAS Electronic Multiline Appearances Set
EMC Electromagnetic Compatibility
EMD Equilibrium Mode Distribution
EMF Electromagnetic Force
EMF Electromotive Force
EMI Electromagnetic Interference
EML Estimated Measured Loss
EMMS External Message Management System
EMP Electromagnetic Pulse
EMP Equipment Management Plan
EMR Electromagnetic Radition
EMS Electronic Mail System
EMS Equilibrium Mode Simulator
EMSCC Electro-Mechanical Switching Control Center
EMV Electromagnetic Vulnerability
ENFIA Exchange Network Facilities Interconnect Arrangement
ENG Engineering
ENQ Enquiry (Bisynch control character)
ENS Extended Network Services
EO End Office
EO Engineering Order (MFG)
EO Executive Order
EOB End of Block
EOB Executive Office Building
EOD End of Data
EOF End of File
EOM End of Message
EON End of Number
EOP Executive Office of the President
EOT End of Transmission (Bisync control character)
EOTS Equipment Order Tracking System
EPA Environmental Protection Agency (U.S.)
EPABX (Digital) Electronic Private Automatic Branch Exchange
EPLANS Engineering, Planning, and Analysis Systems
EPROM Erasable Programmable Read Only Memory
EPS Encapsulated PostScript
EPSCS Enhanced Private Switched Communications Service
EPSN Enhanced Private Switched Network
EPSS Experimental Packet Switching System
EPU Extended Processing Unit
EQL Equipment Location
EQUIPDAT Equipment Database
ER Error Rate
ERA Engineering Research Associates
ERCC Eastern Regional Control Center (NOCC)
ERD Entity Relationship Diagram (IS)
ERDT Expensive Route Delay Time
ERL Echo Return Loss
Erlang Dimensionless unit of traffic intensity used to express the average number of calls underway or the average number of devices in use
ERMA Equipment Repair and Maintenance Applications
ERS Emergency Restoration Services
ERS Employee Records System (no longer used, replaced by HRIS)
ERWT Expensive Route Warning Tone
ES End System
ES Enterprise System
ES Errored Seconds
ES/IS End System/Intermediate System
ESA Emergency Stand Alone
ESAC Electronic Switching Assistance Center
ESF Extended SuperFrame
ESFMS Extended SuperFrame Format Monitoring System
ESL Essential Service Lines (Emergency Service (911) with ringdown trunk)
ESN Electronic Switched Network (Northern Telecom Inc. DMS-100)
ESP Employee Stock Program (HR)
ESP Enhanced Service Provider
ESP Enhanced Services Platform
ESP Essential Service Protection
ESPP Employee Stock Purchase Plan
ESPRIT European Strategic Program for R&D in Information Technologies
ESS Electronic Switching Service
ESS Electronic Switching System
ESS/CO Electronic Switching Service/Central Office
ET Exchange Termination
ETACS Extended Total Access Communications System
ETAS Emergency Technical Assistance Service
ETB End of Block (Bisync control character)
ETHIS Enhanced Trouble Handling Information System
ETI Electronic Telephone Interface
ETL Equipment Test List
ETN Electronic Tandem Network (AT&T Technologies)
ETS Electronic Tandem Switching
ETS Electronic Telephone Set
ETS Electronic Translator System
ETSI European Telecommunications Standards Institute
ETV Educational Television
ETX End of Text (Bisync control character)
E-type pulsing signal An end of pulsing signal used when panel call indicator (PCI) traffic is completed through a crossbar tandem
EUCI Endorsed for Unclassified Cryptographic Items
EUS End User Services
EUT Equipment Under Text
EVA Extreme Value Administration
EVE Extreme Value Engineering
EVFU Electronic Vertical Format Unit
EVHD Extreme Value Estimate of High Day
EVR Electronic Video Recording

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