1. ADSL Forum. 2003 www.dslforum.org/aboutdsl/ADSL2_wp.pdf
2. ANSI. 1992 Integrated service digital network (ISDN)-basic access interface for use on metallic loops for application on the network side of the NT (layer 1 specification) T1601-1992. American National Standards Institute.
3. Multicarrier modulation for data transmission: an idea whose time has come;Bingham;IEEE Communications Magazine,1990
4. The development and standardization of asymmetric digital subscriber line;Chen;IEEE Communications Magazine,1999