Γλωσσάρι Δικτυακών Ορολογιών
Ταξινομημένα προς το παρόν Κατά τελευταία ενημέρωση (αύξουσα) Ταξινόμηση χρονολογικά: Κατά τελευταία ενημέρωση
dial-up lineCommunications circuit that is
established by a switched-circuit connection using the telephone
company network. | |
digital signalLanguage of computers comprising only
two states, on and off which are indicated by a series of voltage
pulses. |
DNSDomain Naming System.
System used in the Internet for translating names of network nodes
into addresses. | |
domainIn the Internet, a portion of the
naming hierarchy tree that refers to general groupings of networks
based on organization-type or geography. | |
DSUData service unit.
Device used in digital transmission that adapts the physical
interface on a DTE device to a transmission facility such as T1 or
E1. The DSU is also responsible for such functions as signal timing.
Often referred to together with CSU, as CSU/DSU. |
DSRData set ready. EIA/TIA-232
interface circuit that is activated when DCE is powered up and ready
for use. |
DTEData terminal equipment.
Device at the user end of a user-network interface that serves as a
data source, destination, or both. DTE connects to a data network
through a DCE device (for example, a modem) and typically uses
clocking signals generated by the DCE. DTE includes such devices as
computers, protocol translators, and multiplexers. |
DTFMDual tone multifrequency.
Use of two simultaneous voice-band tones for dialing (such as touch
tone). |
DTRData terminal ready.
EIA/TIA-232 circuit that is activated to let the DCE know when the
DTE is ready to send and receive data. |
dual-homed stationDevice attached to multiple FDDI rings
to provide redundancy. |
dual homingNetwork topology in which a device is
connected to the network by way of two independent access points
(points of attachment). One access point is the primary connection,
and the other is a standby connection that is activated in the event
of a failure of the primary connection. |
E1Wide-area digital transmission scheme
used predominantly in Europe that carries data at a rate of 2.048
Mbps. E1 lines can be leased for private use from common carriers. | |
E2Wide-area digital transmission scheme
used predominantly in Europe that carries data at a rate of 34.368
Mbps. E3 lines can be leased for private use from common carriers.
|
E channelEcho channel.
64-kbps ISDN circuit-switching control channel. The E channel was
defined in the 1984 ITU-T ISDN specification, but was dropped in the
1988 specification. |
edge deviceNetwork entity such as a LAN segment,
host, or router that connects to a LightStream 2020 ATM switch via
an edge card. Edge devices send and receive the data that passes
through the ATM network. |
EEPROMElectrically erasable
programmable read-only memory.
EPROM that can be erased using electrical signals applied to
specific pins. |
EGPExterior Gateway Protocol.
Internet protocol for exchanging routing information between
autonomous systems. Documented in RFC 904. Not to be confused with
the general term exterior gateway protocol. EGP is an
obsolete protocol that has been replaced by BGP. |
EPROMErasable programmable
read-only memory.
Nonvolatile memory chips that are programmed after they are
manufactured, and, if necessary, can be erased by some means and
reprogrammed. |
EthernetBaseband LAN specification invented by
Xerox Corporation and developed jointly by Xerox, Intel, and Digital
Equipment Corporation. Ethernet networks use CSMA/CD and run over a
variety of cable types at 10 Mbps. Ethernet is similar to the IEEE
802.3 series of standards. |
ETSIEuropean Telecommunication
Standards Institute.
Organization created by the European PTTs and the European Community
(EC) to propose telecommunications standards for Europe |