11.2. Multiuser Basics

Dynamic spectrum management embodies multiple-user communication concepts. All the situations introduced in Section 11.1 contemplate the potential of multiple DSL users who occupy lines in the same binder. These lines may interfere with one another. The resultant crosstalk often is the limiting factor in DSL deployments, determining speeds, ranges, and, indirectly, costs of installation. The possibility of coordinated control of some or all lines for global benefit of all customers is a goal of DSM.

This chapter primarily addresses frequency domain dynamic spectrum management. It is also possible to coordinate the transmission of many lines in the time domain, for burst-mode systems. Such packet level network use is an ...

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