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xDSL Modem/DSLAM

Block Diagram (SBD) for an xDSL (Digital Subscriber Line) Modem / DSLAM solution from Texas Instruments

Block Diagram

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AC/DC Adaptor

Design Considerations

ADSL Modem

An ADSL (Asymatrical Digital Subscriber Line) Modem is a very high-speed data connection that uses the same wires as a regular telephone line. The ADSL divides up the available frequencies available on the phone line so that the high speed channel rates range from 1.5Mbps to 10Mbps, while the low speed channel rates range from 16Kbps to 1Mbps.

Core Subsystem include:

  • DSP/CPU
    - perfoms echo cancellation, error correction, digital coding, and rate adaptation, and high-speed device interface.
     
  • Transmit-Channel Front-End
    - the function of this front-end is to amplify and filter the analog signals created by the digital-to-analog converter (DAC) and deliver them to the phone line at correct power levels .
     
  • Receive-Channel Front-End
    - the function of this front-end is to preamp, filter, and digitize the analog signals from the phone line.
     
  • Hybrid Coupler
    - allows full duplex operation of the modem by separating Tx from Rx signals using the transformer and passive components.
     
  • Network Interface
    - allows the modem to high-speed devices like 802.11 router, Ethernet router, VoIP, and USB.
     
  • Power Conversion
    - converts the input power from the AC adaptor to run various functional blocks.
    

Reference Designs

Description Part # Company
Buck for Modem 3.3V@2A PMP3819 Texas Instruments

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