CHAPTER 1
INTRODUCTION
The EZ Connect ADSL USB Modem (SMC7003USB V.2) provides high-speed Internet access over existing phone lines by making use of previously unused frequency bandwidth above the voice band. By placing ADSL (Asymmetric Digital Subscriber Line) 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. 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 is no need to install any new line.