Also an obsolete term for local echo.
Se dit d'une liaison bidirectionnelle utilisée alternativement dans un sens puis dans l'autre. On dit aussi "à l'alternat".
Site UNIVERSITY OF CAMBRIDGE COMPUTER LABORATORY Home Area Networking Group: http://www.cl.cam.ac.uk/Research/SRG/HAN/.
Architecture of a Home Area Multimedia System: http://www.cs.su.oz.au/~beto/AUUG/Home.html.
An ITU-T link layer protocol standard for point-to-point and multi-point communications. Similar to SDLC.
A transmission system technology that allows telephone companies to use existing copper-cable plants(as opposed to optical fibre) to transmit high bit rate digital trafic. Bit rate are from 784 Kbps to 2 048 Kbps over twisted pair up to 26,246 feet. HDSL needs modems on either end of one or more twisted pair wires that deliver T1 or E1 speeds. At present T1 requires two lines and E1 requires three.
See also ADSL, HDSL,SDSL for one line HDSL, VDSL.
Les 5 premiers octets de la cellule ATM qui fourni les informations de contrôle et d'adressage, incluant des informations de contrôle de flux(GFC, l'identificateur de canal virtuel(VPI), l'identificateur de circuit virtuel(VCI), le type de champ d'information(payload), et la priorité d'abandon de cellule(CLP).
A single byte containing the information needed for the transmission convergence (TC) sub-layer of the ATM physical (PHY) layer to perform error detection on the cell header. If errors are found, the cell is dropped before processing moves up to the ATM layer, where routing takesplace.
5e octet de l'en-tête ATM qui contient les informations nécessaires à la sous-couche transmission convergence (TC) de la couche physique ATM pour détecter les erreurs de l'entête de la cellule ATM. Si une erreur est détectée la cellule est abandonnée avant sa transmission à la couche ATM.
For example, hexadecimal BEAD is decimal 48813:
digit weight value
B = 11 16^3 = 4096 11*4096 = 45056
E = 14 16^2 = 256 14* 256 = 3584
A = 10 16^1 = 16 10* 16 = 160
D = 13 16^0 = 1 13* 1 = 13
-----
BEAD = 48813
There are many conventions for distinguishing hexadecimal numbers from decimal
or other bases in programs. In C language for example, the prefix "0x" is
used, e.g. 0x694A11. Hexadecimal is more succinct than binary for representing
bit-masks, machines addresses, and other low-level constants but it is still
reasonably easy to split a hex number into different bit positions, e.g the
top 16 bits of a 32 bit word are the first four hex digits.
The term was coined in the early 1960s to replace earlier "sexadecimal", which was too racy and amusing for stuffy IBM, and later adopted by the rest of the industry.
Actually, neither term is etymologically pure. If we take "binary" to
be paradigmatic, the most etymologically correct term for base 10, for example,
is "denary", which comes from "deni" (ten at a time, ten each), a Latin
"distributive" number; the corresponding term for base-16 would be something
like "sendenary". "Decimal" is from an ordinal number; the corresponding
prefix for 6 would imply something like "sextidecimal". The "sexa-" prefix
is Latin but incorrect in this context, and "hexa-" is Greek. The word "octal"
is similarly incorrect; a correct form would be "octaval" (to go with decimal),
or "octonary" (to go with binary). If anyone ever implements a base-3 computer,
computer scientists will be faced with the unprecedented dilemma of a choice
between two *correct* forms; both "ternary" and "trinary" have a claim to
this throne.
Représentation des nombres en base 16 utilisant les chiffres de 0 à 9 avec leur signification habituelle, plus les lettres de A à F pour représenter les chiffres hexadécimaux de 10 à 15. Le chiffre le plus à droite représente les unités, les chiffres suivants en allant vers la gauche compte les multiples de 16, puis de 256=16^2, etc..
Par exemple le nombre hexadécimal FACE correspond au nombre décimal 64206
chiffre poids valeur
F = 15 16^3 = 4096 15*4096 = 61440
A = 10 16^2 = 256 10* 256 = 2560
C = 12 16^1 = 16 12* 16 = 192
E = 14 16^0 = 1 14* 1 = 14
-----
FACE = 64206
See HPPI.
A WBEM defined communication protocol. It could either work with or replace legacy protocol like SNMP.
Protocole de communication définit par le Web-Based Enterprise Management(WBEM). Ce protocole peut soit travailler avec les protocoles existants comme SNMP, soit les remplacer. Le WBEM essaye de convaincre l'IETF de commencer officiellement un travail de normalisation sur ce protocole.
Originally defined by Microsoft and the Web-Based Enterprise Management(WBEM, HMMS forms the basis of the CIM data model.
WBEM proposed design for a Web-based management request broker written in C++, part of CIM.
The head position of a buffer (i.e. inside a switch).A blocking phenomenon is associated with the HOL which refers to the fact that cells in the queue have to wait for the HOL cell to depart first.
Position de tête dans un buffer (i.e. à l'intérieur d'uncommutateur ATM). Un phénomène de blocage est associé avec le HOL car les cellules dans la queue doivent attendre que la cellule HOL parte en premier.
{CERN's
home pages list}.
{NCSA
New home pages list}.
(16 Dec 1994)
Nom donné au document principal d'un site web. Ce document constitue le document racine de l'arborescence de la base de donnée du site. C'est aussi le nom donné au document de présentation d'un utilisateur.
En général ce document présente le site, la société ou la personne. C'est le point de départ de la navigation dans la base de données du site.
Voir page d'accueil.
- (Or "node") A computer connected to a network.
- A computer to which one connects using a terminal emulator.
Dedicated Circuit Switched data communications technology for GSM systems which boosts GSM data speeds from the regular 9.6 kbps to 14.4 kbps in a single traffic channel and, by using multiplexing techniques, up to 57.6 kbps. This is achieved by concatenating, i.e. adding together, consecutive GSM timeslots, each of which is capable of supporting 14.4kbit/s. Up to four GSM timeslots are needed for the transmission of HSCSD.
EDGE will boost HSCSD rates even further.
HSCSD is part of the planned evolution of the GSM specification and is included in the GSM Phase 2 development. As it is circuit switched, HSCSD is more suited to applications such as videoconferencing and multimedia than 'bursty' type applications such as email, which is more suited to packet switched data
See GPRS.
Technique pour la transmission de données sur GSM, de 9,6 à 14,4 kbps sur un unique canal, et jusqu'à 57,6 kbps en utilisant des techniques de multiplexage.
Cela est possible en concaténant les intervalles de temps consécutifs: 4 intervalles de temps pour un débit de 38,4 kbits/s. EDGE permettra d'augmenter encore les débits possibles. HSCSD est une partie de l'évolution planifiée des spécifications GSM phase 2. Utilisant la commutation de circuit, HSCSD est approprié pour les applications de vidéoconférence et multimédia plutôt que pour les applications comprenant des pointes de trafic(burst) comme l'EMail pour laquelle la commutation de paquets est plus indiquée.
Voir aussi GPRS .
Network standard for high-speed (up to 52 Mbps) serial connections over WAN links.
An interface between CSU/DSU and DXI.
Norme pour connexions série à haute vitesse(jusqu'à 52 Mbps) au dessus de liaisons WAN.
Interface entre CSU/DSU et DXI.
A Hypertext document format used on the World-Wide Web. Built on top of SGML. "Tags" are embedded in the text. A tag consists of a "<", a "directive", zero or more parameters and a ">". Matched pairs of directives, like "<title>" and "</title>" are used to delimit text which is to appear in a special place or style. Links to other documents are in the form <a name="baz" href="http://machine.edu/subdir/file.html">foo</a> where "a", "/a" delimit an "anchor" called baz, "HREF=" introduces a hypertext reference, which in this case is a Uniform Resource Locator (URL)(the thing in double quotes in the example above). The text "foo" will be the label appearing on the link in the browser. A certain place within an HTML document can be specified by following the document name with a hash (#) and the name of an anchor at that position. Other common tags include <p>for a new paragraph, <b>..</b>for bold text, <ul>for an unnumbered list, <pre>for preformated text, <h1>, <h2>.. <h6>for headings. HTML supports some national characters through special escape sequences.
The client-server TCP/IP protocol used on the World-Wide Web for the exchange of HTML documents. It conventionally uses port 80. Version 1.1 is the current standard.
(originally) A device connected to several other devices.
In ARCnet, a hub is used to connect several computers together. In a message handling service, a number of local computers might exchange messages solely with a hub computer. The hub would be responsible for exchanging messages with other hubs and non-local computers.
(16 Jan 1995)
It resynchronizes and retransmits data signals on a LAN
like a repeater, but also has other
capabilities such as network management.
A term applied to a multiport repeater or
concentrator consisting of a chassis with slots
to be populated by cards, allowing it to be configured with various numbers
and combinations of LAN ports.
Multiport 10BASE-T, 10BASE2,
and fiber optic (10BASE-FL, FOIRL)
repeaters are considered hubs.
See also Smart wiring hub, concentrator,
star topology.
Multi-répéteur: Unité matérielle/logicielle de raccordement d'un ensemble de stations à un réseau local.
Se présente sous la forme d'un coffret ou d'une armoire de concentration dans un réseau local. Le hub resynchronise et retransmet le signal de donnée comme un répéteur, mais peut aussi avoir d'autres fonctionnalités en matière de gestion de réseau par exemple. Un hub est en général multiports afin de relier entre eux plusieurs équipements créant ainsi une topologie en étoile.
Par extension, quelquefois utilisé pour désigner un centre nodal de télécommunications longue distance ou internationale. (voir aussi répéteur, concentrateur).
Méthode de routage ou reroutage de trafic via un pays tiers.