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DSL Advances by Peter J. Silverman, John M. Cioffi, Massimo Sorbara, Thomas Starr

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4.3. Initialization

When an HDSL2 based service is installed, the HDSL2 transceivers need to be configured automatically. The initialization process for an HDSL2 connection has the following phases: “Wake-up,” preactivation, core activation, and data mode. A typical startup time for HDSL2 initialization may range from 15 to 30 seconds. This section provides a brief overview of the HDSL2 initialization procedure.

The main objectives of the initialization process are to

  • Determine the operation settings, for example, the transmit signal power level.

  • Train the core transceiver block components, for example, the echo canceler, equalizer, and so on.

  • Exchange key system parameters, for example, channel precoder coefficients, coefficients to the rate one-half ...

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