Network Device User Guide SMC7003-USB

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C HAPTER 1
I NTRODUCTION
The EZ Connect ADSL USB Modem provides high-speed Internet
access over existing phone lines by making use of previously
unused frequency bandwidth above the voice band. By placing
ADSL signals above the frequency of the voice signal, ADSL
service can coexist on the same line with your telephone service.
ADSL is asymmetric in 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 EZ Connect ADSL USB Modem supports both full-rate Discrete
Multi-Tone (G.dmt) connection (T1.413, Issue II) and the more
economical G.lite connection (G.992.2). This modem delivers
concurrent data and voice over a single connection. It also
supports a Rate Adaptive algorithm to maintain high data integrity
under existing conditions, including varied connection lengths and
degraded signal quality. And because all data is encapsulated in
ATM frames, the EZ Connect ADSL USB Modem can be connected
directly to any standards-compliant DSL Access Multiplexer
(DSLAM) at your service provider’s central office, data is then sent
through an ATM backbone, and out to the Internet via an ISP
router. Moreover, there’s no need to install any new lines.
This plug-in ADSL modem provides an always-on digital
connection that eliminates dial-up delays, and transparent
reconnection when initiating any network request. Full support for
the ATM protocol also provides access to a wide range of
advanced transport features, including support for real-time video,