DSL Advances

2.1. Introduction

This chapter provides summary of useful concepts and formulae for the transmission-systems basics that have been applied to DSL systems. A more comprehensive treatment for DSL occurs in a predecessor to this book [1], and the reader can refer to that earlier book for more details and derivations. The intent is the successful use of these formulae and principles in DSL-system simulations and performance-feasibility studies.

Section 2.2 reviews the transmission methods used in the earliest DSL systems that were primarily baseband systems (i.e., systems with no analog POTS simultaneously preserved on the same line as the DSL), whereas Section 2.3 provides the same for the later DSL methods of QAM/CAP and multicarrier methods, particularly ...