What the ADSL?










What the ADSL?

ADSL means Asymmetric Digital Subscriber Line: technology allowing to transport numeric(digital) data on a classic telephone line and to reach(affect) debits(outputs) of several hundreds of Kbit/. The data are transported by using(employing) a signal on very high frequency. This signal does not come to encroach on the frequencies used to pass on the voice(vote) and leaves the free telephone line for a call(appeal) at the same time as the data are transferred. The debits(outputs) are said asymmetric, because there is no equivalence between the speed of the transmission network-subscriber and that of the transmission subscriber-network.

THE ADSL, how it works you he(it)?

Lorque you phone, know that you use only 10 % of the capacities of the brass sons(threads) of your telephone line what leaves a wide place(square) with transfers high adsl debit(output) on the high frequencies.

To exploit(Run) the remaining 90 % requires the division of the telephone link between the exchange of the operator and the subscriber in 3 very different canals; let be the multiplexing of canals on telephone line.

The first canal manages only the information from ' Internet and works only in this sense(direction). The theoretical maximal speed of data transmission is of 8 Mbits/.

The second canal is capable of transporting information in both senses(directions) (Internet Þ subscribed, subscribed Þ Internet) but it is mainly used to pass on data of the subscriber towards Internet (sending of e-mail for example). The maximal speed is of 800 kbits/.

The third canal ( the smallest) is as for him intended to pass on the voice(vote) during lines.

The creation of these canals is made in the extremities of the telephone lines.

At the subscriber, we proceed to the pose(installation) of filters intended to make the difference between the voice(vote) and the numeric(digital) data.

In the phone exchanges, distributors are installed(settled). They are systems (conscripts DSLAM for DSL Acess Multiplexer) intended for the good points of the data.

They are connected with BOTTOMS(STOCKINGS) (Broadband Access Server) who they play the role of big waiters(servers).

In the same region, DSLAM and IN THE BOTTOM(STOCKING,BOTTOMS,STOCKINGS) forms what we call " a plate(patch) ADSL ".

The connections very high debit(output) called TurboIP leaves these patches to go to the waiters(servers) of access providers and thus then to you.

What the dégroupage?

We say qu’une telephone line is devided into groups lorsqu’elle is linked by an operator different from France Telecom ( FT). In that case, this one rents(praises) the line to FT and connects it to the appropriate(clean) network, at the level of the local telephone exchange ( the distributor).

The dégroupage declines in two choices:

- Partial (or Option 3), he allows to l’opérateur alternate to propose a service high xDSL debit(output) on the high waveband of your line, FT continues to supply the service of telephony on the low band(strip).
A part(party) of the transport of the traffic xDSL is realized by a third operator (or operator of collection) from the distributor. Speakers' chain(channel) can be so summarized: subscribed < > FT < > operator of collection < > FAI.
L’abonnement FT must be thus preserved.

- Total (or Option 1), he allows to l’opérateur alternate to link l’intégralité of your line with his own equipments, and thus to supply you at the same moment the telephony and the high debit(output).
The physical connecting of the subscriber (brass cables) stays the property of FT. The new operator installs(settles) his equipments or Digital Subscriber Line Access Multiplexer ( DSLAMs) in the telephone exchange.
This possibility is rapidly growing.
The termination of the subscription FT owes normally crossed(spent) by your new operator.

With the total dégroupage:
- There are cut of the services proposed by the operators others than FT on your telephone line (selection call(appeal) by call(appeal), preselection). It is thus advisable to refer to the adequate contract to know the conditions of termination.
- It is the manual act which pulls(entails) a more or less long cut of the line.
- Your unique(only) interlocutor is henceforth to l’opérateur who devided into groups your line and generally by the option portability of the number you can keep(preserve) your former(ancient) phone number.
- Your wall phone plugs do not more serve than for receiving your modem ADSL. There is not direct tone anymore.
- Except explicit indication, the employment(use) of the minitel or the telefax is not possible any more.
- If there is electric power cut, breakdown of the modem of connecting, you cannot emit / receive any more of calls(appeals).
- Most of the time the operators propose reductions of price lists(rates) even free access(wantonness) towards certain destinations.




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