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

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6.3. System Functional Reference Model

Figure 6.6 shows the system reference model for SHDSL as defined in G.991.2. The reference model shows one unit located in the CO and the other unit located at the customer premises (CP) location; each unit terminates one end of the subscriber line. Each end unit is typically referred to as an SHDSL transceiver unit (STU). The unit at the central office is labeled STU-C and that at the customer premises is labeled STU-R, where R stands for “remote” location.

Figure 6.6. System reference model.

The reference model in Figure 6.6 shows the different layers of processing required in each STU. At the CO end, the ...

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