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Computing (FOLDOC) dictionary
High bit-rate Digital Subscriber Line
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communications, protocol (HDSL) A form of DigitalSubscriber Line, providing 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.