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About ADSL
Asymmetric Digital Subscriber Line (ADSL) technology provides high-speed data
access across regular phone lines (copper wires) by making use of previously
unused frequency bandwidth above the voice band. By placing the ADSL signal
above the frequency of the voice signal, ADSL service is able to coexist on the
same line with your telephone service. ADSL is asymmetric in the sense that it
provides a higher data rate in the downstream (receive) direction than in the
upstream (transmit) direction. Asymmetric operation is ideal for typical home and
small office use where files and information are downloaded more frequently than
uploaded.
The USB ADSL Modem is capable of supporting the following DSL standards:
ANSI T1.413 Issue 2, ITU G.992.1 (G.DMT), ITU G.992.2 (G.lite), and ITU G.992
Annexes A, B, and C as applicable.
Protocol and Device Driver Selection
The USB ADSL Modem can be easily connected to a USB port on the PC via a
standard USB cable. The USB ADSL Modem is fully software upgradeable so
that new features and updates may be added by simply loading a new version of
the device driver onto your PC.
ADSL modems employ ATM (Asynchronous Transfer Mode) framing. ATM is a
protocol that divides packets into small fixed sized cells for rapid transmission
over high-speed networks. The ATM protocol allows various types of traffic (e.g.
data, voice, and video) to be securely and efficiently carried over the same
network. ATM is being widely deployed by telecommunications carriers in their
backbone networks. Two type of ATM connections are possible, PVC (Permanent
Virtual Circuit) and SVC (Switched Virtual Circuit).
Overview