E1 E3 E & M Signalling
EARN EBCDIC Ebone
ECC E channel Echo
Echo Cancellation echoplex ECL
ECMA ECRC EDI
EDIFACT EEMS EENet
EEPROM EFF EFLA
EGA EGC EGP
EIA EIS EISA
Electronic Mail EMA Email Address
EMI EMS EMPB
emulation mode EN Encapsulation
encapsulation bridging encoder Encryption
end node End System ENS
enterprise network Entity EOT
EPLD EPROM EPS
EPSF equalization Equalizer
ER ERLL error control
error-correcting code error-detecting code ESCON channel
ESDI ES-IS ESF
ESnet Ethernet Ethernet Meltdown
ETSI EU (European Union) Eudora
EUnet Euronet EuropaNet
EWOS EXEC expansion
expedites delivery explicit route explorer frame
exterior gateway protocol External Viewer
E1 Refers to Europe's 2.048
Mbps digital came system Also called CEPT.
E3 The highest transmission
rate generally in the European digital infrastructure (34-Mbps).
E & M Signalling Voice
transmission system that uses separate paths for signalling and voice signals.
The "M" lead (mouth) transmits signal to the end of circuit while the "E"
lead (ear) receives incoming signal.
EARN (European Academic
and Research Network). A network connecting European academic and research
institutions with electronic mail and file transfer services using the
Bitnet protocol. See also: Bitnet
Merged with RARE in 1994 to form
EBCDIC (Extended Binary
Coded Decimal Interchange Code). A standard character-to-number encoding
used primarily by IBM computer systems. See also: ASCII
A pan-European backbone service. One of the leading pan-European
ECC (Error-Correction Code).
Echo Signal distortion occurring
when transmitted signal is echoed back (reflected) to the originating station.
For a modem user, echo has two meanings: A modem can return all received
characters to its local terminal/computer so they can be seen on-screen.
The other meaning of term "echo" is that part of the analog signal the
modem sent out is bounced back by the telephone network to the modem's
receiver, mixing there with the remote modem's signal.
Echo Cancellation A
technique used in high-speed modems to isolate and filter out unwanted
signal energy caused by echoes from the main transmitted signal
echoplex A mode in
which keyboard characters are echoed on a terminal screen upon return of
the appropriate signal from the other end of the line to indicate that
the characters were received corrently.
ECL (Emitted-Coupled Logic).
A circuit that provides high-speed switching by having the emitters of
two transistors connected to a resistor so that only one transistor can
conduct at a given time.
ECMA (European Computer
German industrial research centre in Muenchen.
EDI (Electronic Data
Interchange). The electronic communication of operational data such as
orders and invoices between organizations.
Data Interchange For Administration, Commerce, and Transport). A data exchange
standard administered by the United Nations to be a multi-industry EDI
EEMS (Enhanced Expanded
Memory Specification). A technique for adding memory to PCs that supports
64 page frames and alllows the storage of executable code in expanded memory.
The Estonian Educational and Research Network.
EEPROM (Electrically Erasable
EFF (Electronic Frontier
Foundation). A foundation established to address social and legal issues
arising from the impact on society of the increasingly pervasive use of
computers as a means of communication and information distribution.
EFLA (Extended Four Letter
Acronym). A recognition of the fact that there are far too many TLAs. See
also Three Letter Acronym [Source:
EGA (Enhanced Graphics Adapter).
EGC (Enhanced Graphics Controller).
EGP (Exterior Gateway Protocol).
A protocol which distributes routing information to the routers which connect
autonomous systems. The term "gateway" is historical, as "router" is currently
the preferred term. There is also a routing protocol called EGP defined
904. See also: Autonomous System,
Border Gateway Protocol, Interior
Gateway Protocol. [Source: RFC1392]
EIA (Electronics Industries
Association). A standards organization in the U.S. specializing in the
electrical and functional characteristics of interface equipment.
EIS (Executive Information
System). A collection of programs that organize data and provide information
about a corporation.
EISA (Extended Industry
Electronic Mail (E-Mail) A
system whereby a computer user can exchange messages with other computer
users (or groups of users) via a communications network. Electronic mail
is one of the most popular uses of the Internet. [Source: NNSC]
EMA (Enterprise Management
Architecture) DEC network management.
Email Address The
UUCP or domain-based address that
a user is referred to with. For example, the author's address is email@example.com.
EMI (ElectroMagnetic Interference).
Radiation leakage outside a transmission medium, resulting mainly from
the use of high frequency wave energy and signal modulation EMI can be
reduced by appropriate shielding.
EMS (Expanded memory Specification).
EMPB European Multi Protocol
Backbone Previous EuropaNET (DANTE)
backbone, operated by Unisource.
emulation mode Function
of anetwork control program that enables it to perform activities equivalent
to those performed by a transmission control unit. For example, with the
Cisco Works network management product, NetView's
PU2 emulates the IBM 3274.
EN (End Node). An APPN
end system that supports end-user applications. ENs do not provide routing
services. ENs rely on their directly connected network node (NN) for APPN
technique used by layered protocols in which a layer adds header information
to the protocol data unit (PDU) from
the layer above. As an example, in Internet terminology, a packet would
contain a header from the physical layer, followed by a header from the
network layer (IP), followed by a header
from the transport layer (TCP), followed
by the application protocol data. [Source: RFC1208]
encapsulation bridging Carries
Ethernet frames from one router to another across disparate media, such
as serial and FDDI lines. Contrast
with translational bridging.
encoder A device that
modifies information into the required transmission format.
is the manipulation of a packet's data in order to prevent any but the
intended recipient from reading that data. There are many types of data
encryption, and they are the basis of network security. See also: Data
Encryption Standard. [Source: RFC1392]
end node See EN
End System An OSI
system which contains application processes capable of communicating through
all seven layers of OSI protocols. Equivalent to Internet host.
ENS (Enterprise Network Services).
entreprise network A
(usually large, diverse) network connecting most major points in a company.
Differs from WAN in that it is typicxally
private and contained within a single organization.
terminology for a layer protocol machine. An entity within a layer performs
the functions of the layer within a single computer system, accessing the
layer entity below and providing services to the layer entity above at
local service access points.
EOT (End of Transmission).
Generally, a character that signifies the end of a logical group of characters
EPLD (Electrically Programmable
EPROM (Erasable Programmable
PostScript). EPS formats are generally very useful for printing
to postscript printers. EPS files can be written up to 32-bit CYMK (Cyan,
Yellow, Magenta, Black) file, which is useful for bringing files into other
programs such as Illustrator and QuarkXPress.
EPSF (Encapsulated PostScript
equalization A technique
used to compensate for communications channel distortions.
Equalizer A device
that compensates for distortion
due to signal attenuation and
propagation time with respect to frequency
(reduces the effects of amplitude
frequency and/or phase distortion.
ER (Entity Relationship).
ERLL (Enhanced Run-Lenght-Limited).
error control A technique
for assuring that transmission from a source are received at the destination
error-correcting code A
code having sufficient intelligence and incorporating sufficient signaling
information to enable the detection and correction of many errors at the
error-detecting code A
code that can detect transmission arrors through analysis of received data
based on their adherence to appropriate structural guidelines.
ESCON channel Entreprise
Systems CONnection. An IBM 17-Mbps channel for attaching mainframes to
peripherals, such as storage devices, backup units, and network interfaces.
This channel incorporates fiber channel technology. The ESCON channel replaces
the bus and tag channel, which uses copper multiwire technology.
ESDI (Enhanced Small Device
Interface). A standard that enables storage devices to communicate with
computers, typically transferring data at 10 Mbps, but capable of higher
ES-IS (End System to Intermediate
System protocol). The OSI protocol
by which end systems announce themselves to intermediate systems.
ESF (Extended Superframe
Format). A T1 framing format that uses
the framing but to provide maintenance and diagnostic functions.
ESnet Energy Sciences
network. A multinational internetwork.
Ethernet A 10-Mb/s standard
for LANs, initially developed by Xerox, and later refined by Digital, Intel
and Xerox (DIX). All hosts are connected
to a coaxial cable where they contend for network access using a Carrier
Sense Multiple Access with Collision Detection (CSMA/CD)
paradigm. See also: 802.x, Local
Area Network, Token Ring.
Ethernet Meltdown An
event that causes saturation, or near saturation, on an Ethernet. It usually
results from illegal or misrouted packets and typically lasts only a short
time. [Source: COMER]
ETSI (European Telecommunication
Standards Institute). Organization created by European PTTs and the EC
(European Community) to propose telecommunications standards for Europe.
EU (European Union). The integration
of a number of European countries with the intention to create a common
supranational space, in which persons, goods and services can freely circulate
without hinderings due to national boundaries. more
Eudora Eudora is an electronic
mail program for the Macintosh
and MS-Windows. that is produced and distributed by Qualcomm.
This program makes it possible for anyone with a POP
account and a Macintosh or MS-Windows connected to the network to use their
workstation to read, compose, and send mail. In addition to text messages,
Eudora allows you to receive binary files, such as formatted documents,
that have been sent by other people who are using Eudora or other mail
Mother lode of links and info at Andrew
Starr's Eudora Site
EUnet (European UNIX network).
Designed to provide interconnection and electronic mail services that began
as an extension to Usenet
Euronet A X.25
Packet Switching Data Network for the European Academic and Research entities,
launched in 1978. Disappeared with the subsequent implementation of national
PSDNs in Europe.
European network service. Currently using BT's
IBDNS as its European backbone.
EUUG (European UNIX Users
event Network message
indicating operational irregularities in physical elements of a network
or a response to the occurrence of a significant task, typically the completion
of a request for information.
EWOS (European Workshop
for Open Systems). The OSI Implementors
Workshop for Europe. See OIW.
EXEC Cisco term used
to designate software that interprets commands on Cisco products.
expansion The process
of running a compressed data set through an algorithm that restores the
data set to its original size. See also compression
expedites delivery Generally,
an option set by a specific protocol layer telling other protocol layers
(or the same protocol layer in another network device) to handle specific
data more rapidly.
explicit route In SNA,
a route from a source subarea to
a destination subarea, as specified by a list of subarea nodes and transmission
groups that connect the two.
explorer frame Frame
sent out by a networked device in a source route bridging environment to
determine the optimal route to another networked device.
exterior gateway protocol Any
interwork protocol used to exchange routing information between autonomous
systems. Not to be confused with EGP,
which is a particular instance of an exterior gateway protocol.
External Viewer A
software program that Browser (like
etc.) calls upon to view file formats it does not itself support.