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It is "first world" , claironne France Telecom. Tuesday morning, the operator télécoms carried out a demonstration based on a pre-VDSL system 2 in his Gardens of the Innovation located at Issy-Les-Moulineaux (the Top-of-Seine). This technology of access Internet "ultra rapid" makes it possible to reach a maximum theoretical flow of 100 Mbits/s on symmetrical copper wire of manner, that is to say as well in downward flow (download) as in flow going up (upload). "It is a flow equivalent to that noted on the local area network of a company" , specifies Alain Vellard, director of the research center on the networks of access of France Telecom.
One of the principal interests of this technology is that it makes it possible to offer various services high flow into simultaneous. France Telecom concentrated on a demonstration of the type "numerical leisures of show" starting from a DSLAM of the type VDSL 2 installed in the under-distributor and of a modem VDSL 2 installed at the private individual.
First advantage: the division of the very high flow
Within the same hearth, it would be possible to look into simultaneous two television sets high definition starting from decoders MPEG-4 HD (to count a flow of 12,5 Mbit/s for each receiver), a television set Simple Definition with a decoder MPEG-2 (12 Mbit/s), a service of visiophonie HD (2 Mbit/s) and an access Internet to very high flow starting from a computer (40 Mbit/s). In short, what to satisfy all the needs high flow for all the members of the family.
"the VDSL 2 makes it possible to go up in power in the high flow but on short distances", Alain Vellard moderates. Only the hearths located at less than 500 meters of a distributor will be able indeed to exploit potential VDSL 2 fully. Knowing that the range of the very high flow appears "theoretical" . Blow, the expert in access networks estimates that one has to expect a loss from 20 to 30% of the very high flow posted in the event of deployment on the ground.
The VDSL 2 at disposal of general public in 2007
The recognition of the VDSL 2 is in good way: the International Telecommunication Union (UIT) completed the recommendation of technology in May 2005. One can expect a standardization in the current of the second half of 2006 and one marketing of this type of access in the current of the year 2007, estimates the expert of France Telecom.
When it revealed its new strategy in June, Club Internet had already presented the VDSL 2 like its next technology of reference for the high flow (see edition of June 7, 2005) . The service of access of T-Online France envisaged a deployment "during 2006" , subject to the validation of the committee of experts of the Authority of regulation of the electronic communications and the stations (Arcep) and the homologation of France Telecom.
Will the VDSL 2 bury the VDSL 1?
In the current state, France Telecom affirms not to have taken strategic decision on the deployment of the VDSL 2 in France. The machine of the high flow packs since the operator télécoms hardly has just discovered... the VDSL 1. A first test was carried out in this direction in first quarter of this year (see edition of March 11, 2005) . "If France Telecom decides a massive deployment of this technology, the means will be probably directed towards the VDSL 2", slips Alain Vellard.
Between the exploitation of the ADSL, ADSL 2+ and the potential of the VDSL and optical fibre, France Telecom ensures to want to maintain a certain cohesion and to ensure a cohabitation of technologies high flow. While waiting for that strategic orientations relating to the very high flow are established by the direction of the group.
VDSL 1 against VDSL 2: the match
Various technical points differentiate the VDSL 1 from the VDSL 2. Initially, multiply by two the flow: 50 Mbit/s for the VDSL 1 in down line and 25 Mbit/s in up line for the VDSL 1 against 100 Mbits with a certain symmetry for the VDSL 2. The VDSL 2 comprises only one modulation (DMT) against two modulations for the VDSL 1 (QAM and DMT). Lastly, the use of the hertzian frequencies differs: a band of 12 MHz for the VDSL 1 against a frequency band of 30 MHz in the case of the VDSL 2.
Traducido por google, por tanto no me digais si esta mal traducido
:-| se hace lo que se puede, querido google
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