CABLE MODEM or ADSL Modulation type

Posted on 2007-10-05
Last Modified: 2013-12-21

Can anyone provide me details or even direct me on where i can find details on "MODULATION TYPE" use by cable modem and ADSL router. Most of the google search is mentioning about modulation technique, not the modulation type.

Question by:mikolim
    1 Comment
    LVL 3

    Accepted Solution

    Take a look at: (for ADSL)

    Also from Wikipedia:

    ADSL modems, a more recent development, are not limited to the telephone's "voiceband" audio frequencies. Some ADSL modems use coded orthogonal frequency division modulation (DMT).

    Cable modems use a range of frequencies originally intended to carry RF television channels. Multiple cable modems attached to a single cable can use the same frequency band, using a low-level media access protocol to allow them to work together within the same channel. Typically, 'up' and 'down' signals are kept separate using frequency division multiple access.

    This page also talks about the physical layer that most cable modems use(?)

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