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	INTERCONNECTION GLOSSARY Download a printable version of the Interconnection Glossary. We'd like to hear from you! Email us with any additions, updates or changes  you would like to see made to the glossary. Select from the following:
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E

E&M Signaling	Originally, “Ear” and “Mouth,” now “recEive” and “TransMit.”
E1	Europa 1. Euproean equivalent to T-1 but higher bandwidth. (Also written as E-1.)
E3	Europa 3. Euproean equivalent to T-3 but higher bandwidth. (Also written as E-3.)
E911	Enhanced 911
E911 POTS	Enhanced 911 Plain Old Telephone Service
EA	Economic Area
EAL	Evolution Assurance Level
EAP	Extensible Authentication Protocol
EAS	Extended Area Service
EB	Exabyte
Eb/N0	Bit Energy-to-Noise Density
EBCDIC	Extended Binary Code Decimal Interchange Code
EBONE	European Backbone
E-business	Electronic Business
EBX	Embedded Board, eXpandable
EC	Earth Coverage; Echo Cancellation; Electronic Commerce; Electronically Controlled Coupling; Exchange Character
ECDSA	Elliptic Curve Digital Signature Algorithm
ECH	Echo-Cancelled Hybrid
ECMA	European Computer Manufacturers Association
ECSA	Exchange Carrier Standards Association
ECTF	Enterprise Computer Telephony Forum
EDGE	Enhanced Data rates for GMS Evolution
EDI	Electronic Data/Documents Interchange
EDOA	Erbium-Doped Optical Amplifier
EDTV	Extended Definition Television
.edu	“Education;” one of the top-level Internet domain names
EEE	Electronic Equipment Enclosure
EEHO	Either End Hop Off
EEPROM	Electrically Erasable Programmable Read-Only Memory
EFCI	Explicit Forward Congestion Indication
EFR	Enhanced Full Rate
EFS	Error-Free Seconds
EFT	Electronic Funds Transfer
EGP	Exterior Gateway Protocol
EHF	Extremely High Frequency
EIA	Electronic Industry Association
EIR	Equipment Identity Register
EIRP	Effective Isotropic Radiated Power
E-ISUP	Extended-ISUP
EKMS	Electronic Key Management System
EKTS	Electronic Key Telephone Service
ELEC	See EtherLEC
ELF	Extremely Low Frequency
ELINT	Electronics Intelligence
ELSEC	Electronics Security
E-mail	Electronic Mail
EMC	Electromagnetic Compatibility
EME	Electromagnetic Environment
EMI	Electromagnetic Interference
EMP	Electromagnetic Pulse
EMR	Electromagnetic Radiation
EMRP	Effective Monopole Radiated Power
EMS	Element Management System; Electronic Message System; Enhanced Message Service
EMSED	Emanations Security
EMTOX	Exchanged of Mixed Traffic over X.25
EMV	Electromagnetic Vulnerability
E-Netz	German name for GMS 1800 network
ENQ	Enquiry
ENUM	Electromagnetic Numbering
EOC	Embedded Operations Channel
EOM	End-Of-Message
EOT	End-Of-Transmission character
EPD	Early Packet Discard; Early Path Delay
EPSCS	Enhanced Private Switched Comms. Service
ERL	Echo Return Loss
ERM	Enterprise Relationship Management; Enterprise Resource Message System
ERMES	European Radio Message System
ERP	Effective Radiated Power; Enterprise Resource Planning
ES	Errored Second; Expert System
ESC	Escape character (keyboard)
ESD	Electrostatic Discharge
ESF	Extended Super Frame
ESMR	Enhanced Specialized Mobile Radio
ESN	Electronic Serial Number
ESS	Electronic Switching System; Employee Self-Service
ETACS	Extended Total Access Communications System
ETB	End-of-Transmission Block character
E-tailing	Short for “electronic retailing”
E-TDMA	Extended/Enhanced Time Division Multiple Access
EtherLEC	Ethernet Local Exchange Carrier
ETIS	E- and Telecommunications Informatics Services
ETN	Electronic Tandem Network
ETP	The European Telecommunications Platform
ETSI	European Telecom Standardization Institute
ETX	End-of-Text characters
EUTELSAT	European Telecommunications Satellite Organization
EVM	Error Vector Magnitude
EXZ	Excessive Zeroes
EMC	Electromagnetic compatibility.
EMI	Electromagnetic interference.
E Glass	A low alkali lime alumina borosilicate glass, noted for its good electrical properties.
ETPC	Abbreviation for electrolytic tough pitch copper. It has a minimum conductivity of 99.9%.
Eccentricity	The center of a conductor’s location with respect to the circular cross-section of insulation. Eccentricity is expressed as a percentage of displacement of one circle within the other.
Edge Connector	A one-piece receptacle, containing female contacts, designed to receive the edge of a printed circuit board and interconnect on which the male contacts are etched or printed. The connector may contain either a single or double row of female contacts. Both thermoplastic and thermosetting insulating materials are used.
Edge Dip Solderability Test	The oldest solderability test, it is performed by taking a specially prepared specimen, fluxing it with a non-activated rosin flux, then immersing it into a pot of molten solder at a predetermined rate of immersion for a predetermined dwell and then withdrawing at a particular rate.
Edgeboard Connector	A connector that mates with printed wiring leads running to the edge of a PC board. (Also called Card Edge Connector.)
Edgeboard Contact	A series of contacts printed on or near any edge of a printed board and intended for mating with an edge connector.
Egg Crating	The insulating walls between the cavities within the contact or wire entry face of the connector housing. This prevents shorts and minimizes shock.
Elastomer	A material that at room temperature stretches under low stress to at least twice its length and snaps back to original length upon release of stress.
Electric Strength	The maximum potential gradient that a material can withstand without rupture. (Also called Dielectric Strength and Disruptive Gradient.)
Electrical Connector	Provides fiberoptic transceiver access to AC power (+12 to +15 VDC), then transmits this power source to the unit’s power converter.
Electrical Hold Value	The minimum current that will keep relay contact springs energized. (Also called Hold Current.)
Electrical Resistance Test	A measurement of the resistance from circuit to circuit through the interfacial connection, designed to insure a satisfactory connection.
Electroless Deposition	The deposition of conductive material from an auto-catalytic plating solution without application of electrical current.
Electroless Plating	The controlled autociltalytic reduction of a metal ion on certain catalytic surfaces.
Electrolytic Corrosion	Corrosion by means of electrochemical erosion.
Electrolytic Tough Pitch	A term describing the method of raw-copper preparation to ensure a good physical and electrical grade copper finished product.
Electromagnetism	Magnetism caused by the flow of an electric current.
Electromotive Force	The force that determines the flow of electricity; a difference of electric potential.
Electronic Hook-up Wire	Wires used to make the internal connections between the various electrical parts of electronic assemblies.
Electroplating	The electrode position of an adherent metal coating on a conductive object for protection, decoration, or other purposes.
Electrotinning	Electroplating tin on an object.
Emulation	The imitation of one device by another device.
Encapsulating	Enclosing an article in an envelope of plastic.
End Bell	An accessory similar to a cable clamp that attaches to the back of a plug or receptacle. It serves as an adaptor for the rear of connectors.
End Finish	Quality of the surface at an optical fiber’s end, commonly described as mirror, mist, hackle, chipped, cracked, or specified by final grit size used in polishing.
End Position Mounting	A mounting option for terminal blocks. Contacts in end sections allow an installer to mount blocks with screws in end section holes.
End Separation Loss	The optical power loss caused by distance between the end of a fiber and a source, detector or another fiber. (See also Extrinsic Joint Loss.)
Engaging and Separating Force	The amount of force needed to engage and/or separate contact elements in mating connectors. Force levels vary.
Entrapment	The damaging admission and trapping of air, flux and fumes, it is caused by contamination and plating.
Environment	The aggregate of all conditions that externally influence a device’s performance.
Environmentally Sealed	A connector provided with gaskets, seals, potting or other devices to keep out moisture, dirt, air or dust that might reduce its performance.
Epoxy	A family of thermosetting resins used in the packaging of semiconductor devices. Epoxies form a chemical bond to many metal surfaces.
Equalization	A means to modifying the frequency response of an amplifier or network, thereby resulting in a flat overall response. It is slope compensation done by a module within an amplifier enclosure.
Error Detecting Code	A code in which a data signal conforms to specific rules of construction so that departures from the norm (errors) are automatically detected.
Ethernet	A 10-Mbit/sec CSMA/CD standard, utilizing coaxial cable, developed at Xerox, Rochester, NY.
Eutectic	(1) An isothermal reversible reaction in which a liquid is converted into two or more intimately mixed solids on cooling; the number of solids formed being the same as the number of components in the system. (2) An alloy having the composition indicated by the eutectic point on an equilibrium diagram. (3) An alloy structure of intermixed solid constituents formed by a eutectic reaction.
Expansion Connector	A connector that provides a flexible connection between a rigid conductor and electrical apparatus.
Extraction Tool	A tool used for removing a contact from a connector. A device used for removing taper pins from taper pin receptacles.
Eyelet Installation	The feeding, inserting, staking and fusing of eyelets in printed boards to provide a properly fused connection.
Eyelets	Hollow tubes inserted in terminals or printed boards to provide mechanical support for component leads for electrical connection.

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