From: C y b e r T e c h @ L i s t s . E x M a c h i n a . n e t <http://www.cybercafe21.net> & <http://www.cybercafe21.tv>
Laurent Zanoni �crivait ( Wednesday 4/10/02 09:56 AM ) dans le message ci-dessous: --- >From: C y b e r T e c h @ L i s t s . E x M a c h i n a . n e t ><http://www.cybercafe21.net> & <http://www.cybercafe21.tv> > >Un specialiste (de chez Belgacom peut-etre) peut-il m'expliquer OK pour le DSLAM http://www.howstuffworks.com/dsl3.htm (voir ci-dessous) Maintenant, ca ne dit pas si ce DSLAM est surbook� ou pas ;-)) ... Du genre, est-ce que Belgacom pr�voit la s�curit� et que ce DSLAM est amplement suffisant pour traiter toutes les connexions ADSL branch�es sur la centrale, ou alors, ils se basent sur des statistiques d'utilisation, un peu comme les IP allou�es dynamiquement par les providers? DSL Equipment ADSL uses two pieces of equipment, one on the customer end and one at the Internet service provider, telephone company or other provider of DSL services. At the customer's location there is a DSL transceiver, which may also provide other services. The DSL service provider has a DSL Access Multiplexer (DSLAM) to receive customer connections. [] DSL Transceiver Most residential customers call their DSL transceiver a "DSL modem." The engineers at the telephone company or ISP call it an ATU-R. Regardless of what it's called, it's the point where data from the user's computer or network is connected to the DSL line. The transceiver can connect to a customer's equipment in several ways, though most residential installation uses USB or 10 base-T Ethernet connections. While most of the ADSL transceivers sold by ISPs and telephone companies are simply transceivers, the devices used by businesses may combine network routers, network switches or other networking equipment in the same platform. DSLAM The DSLAM at the access provider is the equipment that really allows DSL to happen. A DSLAM takes connections from many customers and aggregates them onto a single, high-capacity connection to the Internet. DSLAMs are generally flexible and able to support multiple types of DSL in a single central office, and different varieties of protocol and modulation -- both CAP and DMT, for example -- in the same type of DSL. In addition, the DSLAM may provide additional functions including routing or dynamic IP address assignment for the customers. The DSLAM provides one of the main differences between user service through ADSL and through cable modems. Because cable-modem users generally share a network loop that runs through a neighborhood, adding users means lowering performance in many instances. ADSL provides a dedicated connection from each user back to the DSLAM, meaning that users won't see a performance decrease as new users are added -- until the total number of users begins to saturate the single, high-speed connection to the Internet. At that point, an upgrade by the service provider can provide additional performance for all the users connected to the DSLAM. >comme est implemente la partie 'Terminal ADSL' dans les centrales Belgacom ? > >Je sais qu'a un bout de la ligne (chez moi) il y a un modem ADSL, a l'autre >bout y-a-t-il >aussi un modem par ligne ou bien est-ce multiplexe (avec un DSLAM ?)? C'est >ce que j'ai cru >comprendre dans un article d'Elektor. Si c'est effectivement multiplexe, >combien de lignes >arrivent sur le meme Multiplexeur ? Est-ce qu'il est possible qu'a certains >moments le >multiplexeur soit sature et n'accepte plus de nouvelles connexions. > >En fait , chez moi j'ai un probleme bizarre, en general le matin et >l'apres-midi, j'arrive a me connecter >sans trop de probleme, par contre en soiree, c'est bcp plus difficile (hier >pas possible de 19H->23H, ensuite >OK), je me dis qu'il y a peut-etre une surcharge a certains moments ? > >Si qqun a une autre explication...? > >Laurent > > > >HEBERGEMENT DE SITE WEB: 1 GB d'espace disque, 500 emails, PHP, MySQL >pour 120 euros TTC par an! Plus d'infos sur http://WWW.INFOMANIAK.BE >- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - >CCTK vous est offert par Emakina <http://www.emakina.com> >Pour vous desabonner <mailto:[EMAIL PROTECTED]> --- Jean-Michel Reghem Voice Technology Development Engineer E-Mail : mailto:[EMAIL PROTECTED] Babel Technologies S.A. Boulevard Dolez 33 B-7000 Mons (Belgium) Tel: +32-(0)65 37.43.03 http://www.babeltech.com HEBERGEMENT DE SITE WEB: 1 GB d'espace disque, 500 emails, PHP, MySQL pour 120 euros TTC par an! Plus d'infos sur http://WWW.INFOMANIAK.BE - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - CCTK vous est offert par Emakina <http://www.emakina.com> Pour vous desabonner <mailto:[EMAIL PROTECTED]>
