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Megabit Modem 410F and 420F User Manual 67
9
TECHNICAL REFERENCE
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.