TECHNICAL REFERENCE

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This chapter provides technical information about features of the Megabit Modem 410F and 420F.

ADSL

The DMT ADSL technology provides the high-speed transmission between the Megabit Modem 410F and 420F. This transmission occurs over a single-pair telephone line.

Asymmetric Digital Subscriber Line (ADSL) is the technology used to transmit data between the Megabit Modem 410F and 420F at the physical layer. It provides data at asymmetric rates so that downstream traffic from the 410F to the 420F is faster than upstream traffic from the 420F to the 410F. The downstream transmission rate is up to 7.552 Mbps, while the upstream rate is up to 928 kbps.

Discrete Multitone (DMT) is the line coding used for ADSL. Basically, it divides the bandwidth into subchannels. Some subchannels are allocated to upstream and downstream traffic.

DMT ADSL provides rate-adaptive transmission that allows the best transmission rate determined by distance and line conditions.

Megabit Modem 410F and 420F User Manual

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