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

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6.10. Initialization

Initialization in SHDSL consists of two phases: the preactivation phase and the core activation phase. Figure 6.24 shows the total activation sequence for SHDSL link initialization. The preactivation phase consists of two handshake sequences and a line probe session, whose total goal is to negotiate system parameters and learn the best SHDSL configuration that can be supported on the given channel. Once the system configuration parameters are determined from the preactivation phase, the core activation phase trains the modem for optimum performance when transitioning to data mode.

Figure 6.24. SHDSL total activation sequence.

As seen in Figure 6.24, there are numerous timer values associated with the total activation time. ...

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