HDSL is an acronym for High bit-rate Digital Subscriber Line.
It provides T1 or E1 connections over two or three twisted-pair copper lines, respectively. Unlike most other forms of DSL, HDSL is not a typical consumer service, it's used mostly to replace traditional T1/E1 connections, such as connecting PBXes to telco offices.
The advantage of HDSL over the Alternate Mark Inversion line coding scheme traditionally used on T1/E1 lines is that it requires about an order of magnitude lower bandwidth to carry the same traffic.

Source : http://www.dict.org

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