DSL Advances

9.4. The “Primary” DSL Signal Spectra

This section describes power spectral densities of different DSL transmit signals that are deployed in the network. The label “primary” means that the DSL systems described here were the early generation to be deployed; hence they form the basis for definition of spectral compatibility. The standards based DSL include ISDN (integrated services digital network), HDSL (high-rate digital subscriber line), and DMT-based ADSL (asymmetric digital subscriber line). Other DSLs signals include 2B1Q based SDSL (symmetric digital subscriber line), CAP-based MSDSL (multirate symmetric digital subscriber line), and CAP-based RADSL (rate adaptive digital subscriber line) per Committee T1 TR-059. The signals targeting symmetric ...