Adsl Exposed; Figure 12 Pots And Adsl Frequency Spectra - Alcatel speed touch home Advanced User's Manual

4 ADSL Connectivity
4.1

ADSL Exposed

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ADSL is short for Asymmetric Digital Subscriber Line. This
somewhat cryptic name is best explained in straightforward terms:
Line, because ADSL uses the ordinary existing copper line,
"
known as local loop", that runs between your home or office
premises and one of the telephone operators' main switching
exchanges, known as a central office.
Subscriber: that's you. Because this is what service providers
"
or operators call their customers or end users.
Digital, because ADSL is used to transmit digital signals, just
"
like those that make up computer files.
Asymmetric, because ADSL can transmit data much faster
"
from the Internet towards the end user than the other way
around. It is rather like having a major highway in one
direction and a one lane road in the other.
Because Plain Old Telephone Service (POTS) and ADSL occupy
distinct frequency spectra (See figure 12), ADSL service can coexist
with conventional telephone service.
80kHz 125kHz
Figure 12 POTS and ADSL Frequency Spectra
As a result, your telephone lifeline service will never be affected by
any possible Speed Touch Home failure.
ADSL
UPSTREAM
207kHz
ADSL
DOWNSTREAM
272kHz 1.1MHz
adsl 0609/ 01
3EC 17096 AAAA TCZZA Ed. 01