ADSL (Asymmetric Digital Subscriber Line)

This technology, through installation of special electronic filters, permits transforming the normal analog telephone line into a high-speed digital line with a maximum bandwidth of 640 kbps. This type of connection is "asymmetrical" in the sense that the maximum transmission and reception rates are different (640 kbps downstream to the user, 128 kbps for outgoing information). Connection requires a special expansion card (ADSL terminal unit, improperly called an ADSL modem).
The ADSL connection is a permanent 24-hour-a-day Internet connection that does not interfere in any way with normal telephone service (unlike standard modems and ISDN, ADSL does not make calls but provides continuously-available, "always-on" connection). Among the various types of so-called "broadband connections" this is the most widely used and advertised. Its advantages are reasonable prices and no need of particular structural work, a data transfer capacity much higher than the traditional telephone line (PSNT) or the ISDN connection.

back

Menù

Tutor

forward