High bit-rate Digital Subscriber Line (HDSL) A form of , providing or connections over two or three 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 to offices. The advantage of HDSL over the 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. (1998-05-18)
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