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WikiPedia: High-bit-rate digital subscriber line http://www.commsdesign.com/main/1999/08/9908feat2.... http://www.itu.int/rec/T-REC-G.991.1-199810-I/en http://www.etsi.org/deliver/etsi_etr/100_199/152/0... http://www.etsi.org/deliver/etsi_etr/100_199/152/0... http://www.etsi.org/deliver/etsi_etr/100_199/152/0... http://www.gare.co.uk/technology_watch/copper.htm https://books.google.com/books?id=VWaMdIq2w8QC https://web.archive.org/web/20020527231452/http://...